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P2133 Throttle/Pedal Position Sensor/Switch "F" Circuit High Input
The P2133 Throttle/Pedal Position Sensor/Switch "F" Circuit High Input diagnostic trouble code indicates that the Engine Control Module (ECM/PCM) has detected a voltage signal from the throttle or accelerator pedal position F circuit that is higher than the expected range.
In simple terms, the vehicle's computer is receiving a throttle or accelerator pedal position signal that is too high.
The ECM continuously monitors throttle and pedal position signals to determine driver input and verify correct electronic throttle operation. When the F circuit voltage exceeds the manufacturer's programmed limit, the ECM can store P2133 and may activate a protective or reduced-power strategy.
Depending on the vehicle, symptoms may include the Check Engine Light, reduced engine power, poor throttle response, hesitation, limp mode, inconsistent acceleration, engine surging, rough running, or stalling.
The exact meaning and physical location of the F circuit varies by manufacturer. It may be associated with an accelerator pedal position sensor, electronic throttle body, or another throttle/pedal position sensing circuit.
What Does P2133 Mean?
P2133 means that the ECM/PCM has detected a high voltage condition in the throttle/pedal position sensor or switch F circuit.
The important word is "High."
The computer expects the F circuit to operate within a specific voltage range. If the signal rises above the expected maximum, P2133 may be triggered.
A high F-circuit signal can be caused by:
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A short to battery voltage
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Incorrect reference voltage
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Faulty position sensor
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Open or damaged ground circuit
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Damaged wiring
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Corroded connector
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Loose terminal
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Internal throttle-body failure
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Accelerator pedal sensor failure
A high-input code does not automatically mean that the sensor itself is defective.
What Is the Throttle/Pedal Position Sensor?
The throttle and accelerator pedal position sensors provide electronic position information to the ECM.
Modern vehicles commonly use electronic throttle control rather than a mechanical throttle cable.
A typical system operates as follows:
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The driver presses the accelerator pedal.
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Accelerator pedal position sensors detect movement.
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The ECM receives the position signals.
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The ECM determines the requested engine torque.
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The ECM commands the electronic throttle actuator.
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The throttle plate moves.
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Throttle position sensors provide feedback.
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The ECM continuously checks the signals.
Multiple position signals may be used so the ECM can verify that the throttle system is operating correctly.
What Does "F Circuit" Mean?
The F designation refers to a specific throttle or pedal position sensor circuit identified by the vehicle manufacturer.
It does not necessarily mean that there is a separate physical component called "Sensor F."
Depending on the vehicle, the F circuit may be:
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Part of the accelerator pedal assembly
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Integrated into the electronic throttle body
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One of several throttle position sensor signals
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Part of a redundant electronic throttle-control circuit
The exact circuit location, pin number, and voltage specifications must be confirmed using the vehicle-specific wiring diagram and service information.
Sensor letter assignments are not universal across all vehicle manufacturers.
What Does "High Input" Mean?
"High input" means the ECM is detecting a higher-than-expected electrical signal on the F circuit.
The ECM compares the measured voltage with a programmed range.
A high signal can occur when:
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The signal wire contacts battery voltage.
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The sensor ground is interrupted.
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The sensor itself fails internally.
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The reference circuit has a problem.
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A connector develops a fault.
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Wiring has been incorrectly repaired.
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Another electrical circuit feeds voltage into the signal wire.
The actual voltage threshold varies by vehicle and should be checked against manufacturer specifications.
Symptoms of P2133
Symptoms can vary considerably depending on the vehicle and how high the F circuit signal becomes.
Check Engine Light
The Check Engine Light is one of the most common symptoms.
Reduced Engine Power
The ECM may limit engine output to protect the throttle-control system.
Poor Throttle Response
The accelerator may feel slow or inconsistent.
Hesitation
The engine may hesitate when the accelerator is pressed.
Poor Acceleration
Engine power may be reduced.
Limp Mode
The vehicle may enter a reduced-power or fail-safe operating mode.
Inconsistent Acceleration
Engine response may not correspond correctly with pedal movement.
Engine Surging
Some vehicles may experience unstable engine-speed changes.
Rough Idle
Incorrect throttle-position information can affect idle control.
Engine Stalling
A severe throttle-position fault may contribute to stalling.
Cruise Control Disabled
Cruise control may be disabled when a throttle-control fault is detected.
Warning Messages
Depending on the vehicle, the dashboard may display:
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Reduced engine power
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Service throttle system
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Electronic throttle control fault
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Engine fault
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Drive system fault
Common Causes of P2133
Faulty Throttle or Pedal Position Sensor
A position sensor may internally fail and produce a voltage higher than expected.
Possible problems include:
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Internal sensor failure
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Damaged sensing element
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Internal electrical short
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Incorrect output voltage
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Sensor wear
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Contamination
If the sensor is integrated into the throttle body or accelerator pedal, the complete assembly may need to be replaced.
Short to Battery Voltage
A short to battery voltage is an important cause of a high-input code.
If the F signal wire contacts a power supply, the ECM can see a voltage much higher than the normal sensor output.
Possible locations include:
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Damaged wiring
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Melted insulation
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Incorrect splice
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Pinched harness
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Connector damage
Faulty Sensor Ground
A sensor with a poor or interrupted ground can produce an abnormally high signal.
Possible causes include:
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Broken ground wire
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Corroded ground connection
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Loose terminal
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Damaged connector
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Poor ECM/PCM ground
A ground problem can sometimes make a sensor signal appear much higher than normal.
Damaged Wiring
Wiring damage can cause P2133.
Possible problems include:
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Melted insulation
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Chafing
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Broken wires
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Exposed conductors
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Pinched harnesses
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Heat damage
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Engine vibration
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Previous repair damage
Corroded Electrical Connector
Corrosion can interfere with sensor operation.
Inspect for:
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Green corrosion
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White deposits
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Moisture
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Oxidized terminals
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Loose pins
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Damaged connector housing
Loose or Damaged Terminal
A loose terminal can create an abnormal sensor connection.
Possible problems include:
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Poor terminal tension
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Bent pin
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Backed-out terminal
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Corroded contact
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Partially disconnected connector
Reference-Voltage Problem
Many electronic position sensors use a regulated reference voltage.
If the reference voltage becomes higher than specified, the sensor output may also become abnormal.
Possible causes include:
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Reference circuit fault
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Short to power
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Wiring problem
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Another sensor affecting the reference circuit
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ECM/PCM fault
Open Ground Circuit
An open sensor-ground circuit can cause the signal voltage to rise toward the available reference or supply voltage.
This can create a high-input condition even when the sensor itself is not the root cause.
Faulty Electronic Throttle Body
If the F circuit is integrated into the throttle body, an internal fault can produce P2133.
Possible problems include:
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Internal TPS failure
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Internal circuit failure
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Actuator problem
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Damaged internal wiring
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Throttle-position feedback fault
Accelerator Pedal Assembly Failure
If the F circuit is part of the accelerator pedal position system, an internal pedal sensor failure may produce P2133.
Possible causes include:
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Internal sensor failure
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Internal wiring problem
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Damaged pedal assembly
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Electrical contact failure
Low Battery or Charging-System Problems
Electronic throttle systems can be affected by unstable electrical voltage.
Possible causes include:
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Weak battery
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Alternator problems
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Poor battery terminals
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Charging-system wiring faults
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Poor engine grounds
If several electrical codes appear simultaneously, system voltage should be checked.
Throttle Plate Contamination
Carbon buildup can interfere with throttle plate movement.
Possible symptoms include:
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Sticking throttle
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Rough idle
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Poor acceleration
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Slow throttle response
However, carbon buildup by itself does not necessarily explain a high electrical input. The electrical circuit should still be tested.
Mechanical Throttle Binding
A throttle plate that does not move freely can affect position feedback.
Possible causes include:
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Carbon deposits
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Debris
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Damaged throttle shaft
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Mechanical damage
Incorrect Previous Repairs
Poor electrical repairs can create high-input conditions.
Examples include:
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Incorrect wiring
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Poor splices
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Incorrect pin connections
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Pinched harnesses
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Wrong connector installation
Aftermarket Modifications
Potential sources include:
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Pedal controllers
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Throttle-response devices
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ECU tuning
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Modified wiring
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Engine swaps
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Aftermarket throttle components
Poorly installed modifications can interfere with the F circuit.
Faulty ECM/PCM
A control-module fault is possible but generally less common than sensor, wiring, connector, ground, or reference-voltage problems.
The ECM/PCM should only be considered after the external circuits have been thoroughly tested.
Vehicles Commonly Affected by P2133
P2133 can occur on many OBD-II vehicles equipped with electronic throttle or accelerator pedal position systems.
Examples may include:
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Ford F-150
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Ford Explorer
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Ford Mustang
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Ford Focus
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Ford Ranger
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Chevrolet Silverado
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Chevrolet Tahoe
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Chevrolet Malibu
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Chevrolet Camaro
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GMC Sierra
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GMC Yukon
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Cadillac Escalade
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Dodge Charger
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Dodge Challenger
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Ram 1500
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Jeep Grand Cherokee
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Jeep Wrangler
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Chrysler Pacifica
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Toyota Camry
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Toyota Tundra
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Toyota Tacoma
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Honda Accord
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Honda Civic
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Honda CR-V
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Nissan Altima
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Nissan Pathfinder
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Nissan Titan
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BMW 3 Series
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BMW 5 Series
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Mercedes-Benz C-Class
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Mercedes-Benz E-Class
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Volkswagen Golf
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Volkswagen Passat
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Audi A4
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Audi A6
This list is not exhaustive.
P2133 can occur on any compatible vehicle when the ECM detects a voltage above the expected range in the relevant throttle/pedal position F circuit.
Important: The exact component, circuit location, and voltage specifications vary by manufacturer.
How Is P2133 Diagnosed?
Diagnosis should determine whether the high signal is caused by the sensor, wiring, ground, reference voltage, connector, throttle body, accelerator pedal assembly, or ECM/PCM.
Check for Additional Trouble Codes
Perform a complete diagnostic scan.
Look for:
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P2133
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Other throttle position codes
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Accelerator pedal position codes
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Throttle actuator codes
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5-volt reference codes
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Sensor circuit codes
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Battery-voltage codes
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Communication codes
Additional codes can help identify the affected circuit.
Check Freeze-Frame Data
Review the freeze-frame information recorded when P2133 was stored.
Useful information may include:
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Engine RPM
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Vehicle speed
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Engine load
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Battery voltage
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Accelerator pedal position
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Throttle position
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Coolant temperature
This can show when the high-input condition occurred.
Identify the F Circuit
Use the vehicle-specific wiring diagram to determine:
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Which component contains the F circuit
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F circuit signal wire
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Reference-voltage circuit
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Sensor ground
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ECM/PCM terminal
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Expected signal voltage
Do not rely on generic pin assignments.
Monitor Live Data
Use a capable scan tool to monitor the relevant throttle/pedal position data.
Look for:
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F circuit position value
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Throttle position
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Accelerator pedal position
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Commanded throttle position
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Actual throttle position
If the F signal is abnormally high while the pedal or throttle is in a normal position, further circuit testing is required.
Check the F Circuit Voltage
Using the manufacturer's wiring diagram and test procedure, measure the F circuit voltage.
Compare the measurement with the specified range.
A high reading may indicate:
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Short to power
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Open ground
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Faulty sensor
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Reference-voltage problem
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Wiring fault
Check Sensor Reference Voltage
Measure the reference voltage according to manufacturer specifications.
Many systems use approximately 5 volts, but the exact value must be confirmed for the vehicle.
If the reference voltage is too high, investigate the reference circuit before replacing the sensor.
Check Sensor Ground
Verify that the sensor ground has a proper electrical connection.
A poor ground can make the signal appear abnormally high.
Inspect the Wiring Harness
Inspect the F circuit wiring for:
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Chafing
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Melted insulation
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Exposed conductors
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Pinched wires
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Broken wiring
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Incorrect repairs
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Contact with power circuits
Pay particular attention to areas near hot engine components and moving parts.
Inspect Electrical Connectors
Check the accelerator pedal or throttle-body connector for:
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Corrosion
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Water intrusion
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Bent pins
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Loose terminals
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Backed-out terminals
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Damaged locking mechanisms
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Heat damage
Check for Short to Power
Test the F signal circuit for unwanted continuity to:
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Battery voltage
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Ignition voltage
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Another powered circuit
A short to power can directly cause a high-input code.
Check for an Open Ground
If the sensor ground is open, the F signal may rise abnormally.
Verify ground continuity and voltage drop according to the manufacturer's procedure.
Perform Voltage-Drop Testing
Voltage-drop testing can identify excessive resistance in:
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Ground circuits
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Power circuits
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Connector terminals
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Wiring splices
Test the Sensor With a Multimeter
Depending on the manufacturer's procedure, monitor the F signal while moving the throttle or accelerator pedal.
The signal should operate smoothly within the specified range.
Look for:
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Excessive voltage
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Sudden voltage jumps
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Signal spikes
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Abnormal fixed voltage
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Irregular changes
Test the Electronic Throttle Body
If the F circuit is integrated into the throttle body, test:
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Power supply
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Ground
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Reference voltage
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F signal
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Other throttle position signals
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Actuator operation
Replace the throttle body only when testing confirms an internal fault.
Test the Accelerator Pedal Assembly
If the F circuit is part of the accelerator pedal assembly, test the pedal position signals according to manufacturer specifications.
If an internal sensor is defective, the complete pedal assembly may require replacement.
Inspect the Throttle Plate
Check for:
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Carbon buildup
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Debris
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Mechanical sticking
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Restricted movement
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Damaged throttle plate
Check Battery and Charging Voltage
Verify:
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Battery condition
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Battery terminals
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Alternator output
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Charging voltage
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Engine grounds
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Chassis grounds
Check for Aftermarket Modifications
Inspect for:
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Pedal controllers
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Throttle-response devices
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ECU tuning
-
Modified wiring
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Engine swaps
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Non-standard throttle components
Check ECM/PCM Power and Grounds
Verify:
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Battery power
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Ignition power
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ECM/PCM grounds
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Sensor reference circuits
How to Fix P2133
The correct repair depends on the cause identified during diagnosis.
Replace a Faulty Position Sensor
If testing confirms internal sensor failure, replace the applicable sensor or assembly.
Replace a Faulty Accelerator Pedal Assembly
If the F circuit is integrated into the pedal assembly and the sensor has failed, replace the pedal assembly when required by the vehicle manufacturer.
Replace a Faulty Electronic Throttle Body
If internal throttle position sensor or electronic circuit failure is confirmed, replace the throttle body or applicable assembly.
Repair Damaged Wiring
Repair or replace wiring affected by:
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Heat
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Chafing
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Vibration
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Corrosion
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Previous repairs
Repair or Replace Damaged Connectors
Replace damaged connector housings or terminals and restore proper terminal tension.
Repair Sensor Ground Problems
Repair loose, damaged, or corroded sensor grounds.
Repair Reference-Voltage Problems
Repair the reference-voltage circuit if testing shows that it is outside specification.
Repair Short Circuits
Locate and repair wiring shorted to:
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Battery voltage
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Ignition power
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Another electrical circuit
Clean the Throttle Body
If carbon buildup is causing mechanical sticking, clean the throttle body according to the manufacturer's procedure.
Correct Previous Repairs
Repair incorrect wiring, poor splices, and improperly installed connectors.
Correct Aftermarket Modifications
Restore the original throttle-control configuration if an aftermarket modification is responsible for the fault.
Perform Required Relearn Procedures
Some vehicles may require:
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Throttle body relearn
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Accelerator pedal calibration
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Idle relearn
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Electronic throttle adaptation
Always follow the manufacturer-specific procedure.
Repair or Replace the ECM/PCM
The ECM/PCM should only be considered after the F circuit, sensor, wiring, connectors, reference voltage, grounds, and power supplies have been properly tested.
What Happens If P2133 Is Ignored?
Ignoring P2133 can cause continuing throttle-control problems.
Possible consequences include:
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Reduced engine power
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Poor acceleration
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Limp mode
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Engine hesitation
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Rough running
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Engine stalling
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Poor fuel economy
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Additional throttle-control codes
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Increased emissions
Because P2133 involves an abnormally high throttle or pedal position signal, the ECM may activate a fail-safe strategy to prevent unreliable throttle operation.
Can You Drive With P2133?
Driving with P2133 should be approached cautiously because the code involves an electronic throttle or pedal position signal.
A short trip may be possible if:
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The engine runs smoothly.
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Throttle response remains predictable.
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There is no major power loss.
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The vehicle is not stalling.
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The Check Engine Light is not flashing.
Avoid continued driving if you experience:
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Sudden power loss
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Severe hesitation
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Unpredictable throttle response
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Repeated stalling
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Reduced-power mode
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Flashing Check Engine Light
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Multiple warning messages
If throttle response becomes unpredictable or the vehicle enters reduced-power mode, it should be inspected before continued driving.
Is P2133 a Serious Code?
P2133 is generally considered a moderate to potentially high-severity diagnostic trouble code because it involves an electronic throttle or accelerator pedal position circuit.
The ECM uses these signals to determine and verify throttle operation.
A high-input condition can cause the ECM to:
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Limit engine power
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Enter limp mode
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Disable cruise control
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Alter throttle operation
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Trigger warning messages
The seriousness depends on the vehicle and how the throttle system behaves.
The code should be diagnosed promptly, especially if there is reduced engine power or unpredictable throttle response.
How to Prevent P2133
Recommended practices include:
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Keep throttle-body and accelerator-pedal connectors clean and dry.
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Repair damaged wiring promptly.
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Secure wiring away from heat and moving components.
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Maintain battery terminals.
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Maintain engine and chassis grounds.
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Address charging-system problems quickly.
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Keep the throttle body clean when appropriate.
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Avoid poorly designed throttle modifications.
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Avoid low-quality electrical repairs.
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Inspect wiring after major engine repairs.
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Use correct replacement parts.
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Do not ignore Check Engine Light warnings.
P2133 vs. Related Codes
| Code | General Description |
|---|---|
| P2133 | Throttle/Pedal Position Sensor/Switch F Circuit High Input |
| P2132 | Throttle/Pedal Position Sensor/Switch F Circuit Low Input |
| P2131 | Throttle/Pedal Position Sensor/Switch F Circuit Range/Performance |
| P2130 | Throttle/Pedal Position Sensor/Switch F Circuit |
| P2134 | Throttle/Pedal Position Sensor/Switch F Circuit Intermittent |
| P2135 | Throttle Position Sensor A/B Voltage Correlation |
| P2136 | Throttle/Pedal Position Sensor/Switch A/C Voltage Correlation |
| P2137 | Throttle/Pedal Position Sensor/Switch B/C Voltage Correlation |
| P2138 | Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation |
| P2139 | Throttle/Pedal Position Sensor/Switch D/F Voltage Correlation |
| P2140 | Throttle/Pedal Position Sensor/Switch E/F Voltage Correlation |
The P2130–P2134 codes concern different conditions involving the F throttle/pedal position circuit, while P2135 and later codes in this group identify correlation problems between different position-sensor signals.
Final Thoughts
The P2133 Throttle/Pedal Position Sensor/Switch "F" Circuit High Input diagnostic trouble code indicates that the ECM/PCM has detected a voltage signal from the relevant F circuit that is higher than the expected operating range.
Common causes include:
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Faulty throttle or pedal position sensor
-
Faulty accelerator pedal assembly
-
Faulty electronic throttle body
-
Short to battery voltage
-
Open sensor-ground circuit
-
Damaged wiring
-
Corroded connectors
-
Loose or backed-out terminals
-
Reference-voltage problems
-
Low system-voltage problems
-
Throttle plate contamination or binding
-
Incorrect previous repairs
-
Aftermarket modifications
-
ECM/PCM faults
The first step is to identify exactly what the F circuit represents on the specific vehicle.
A capable scan tool and multimeter can then be used to determine whether the signal is genuinely too high and whether the problem comes from the sensor, wiring, ground, reference voltage, connector, throttle body, or accelerator pedal assembly.
P2133 does not automatically mean that the throttle body or accelerator pedal needs to be replaced. A short to power, open ground, damaged wire, poor connector, or reference-voltage problem can produce the same high-input condition.
Finding the actual source of the excessive F-circuit voltage is essential for restoring correct electronic throttle operation, preventing reduced-power mode, and maintaining safe vehicle driveability.
