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P2152 Fuel Injector Group "C" Supply Voltage Circuit/Open
The P2152 Fuel Injector Group "C" Supply Voltage Circuit/Open diagnostic trouble code indicates that the Engine Control Module (ECM/PCM) has detected an open, interrupted, or missing electrical supply in the circuit associated with Fuel Injector Group "C".
In simple terms, the vehicle's computer has detected that the electrical power needed by the affected fuel injector group is not reaching the injectors correctly.
Fuel injectors require a reliable electrical supply to operate. If the Group C supply circuit is open, one or more injectors may stop operating or operate intermittently. Depending on the vehicle and the number of affected injectors, this can cause engine misfires, rough idle, hard starting, hesitation, poor acceleration, reduced power, engine stalling, increased emissions, and poor fuel economy.
The exact meaning of Fuel Injector Group "C" is manufacturer-specific. Group C may represent a particular group of cylinders, several injectors sharing a power supply, a specific injector bank, or another manufacturer-defined circuit.
What Does P2152 Mean?
P2152 indicates that the ECM/PCM has detected an open electrical supply circuit for Fuel Injector Group C.
An open circuit means that the intended electrical path is interrupted, preventing current from flowing normally.
The interruption may be caused by:
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Broken wiring
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Disconnected injector connector
-
Blown fuse
-
Faulty injector relay
-
Corroded terminals
-
Loose electrical connections
-
Damaged fuse-box terminal
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Damaged power-distribution wiring
-
Broken injector harness
-
Incorrect previous wiring repair
-
Short circuit that caused a fuse to open
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Faulty injector
-
ECM/PCM power or control problems
The problem may affect one injector or several injectors, depending on the vehicle's electrical design.
What Is Fuel Injector Group C?
A fuel injector is an electronically controlled component that delivers fuel into an engine cylinder.
Some engines use shared electrical supply circuits for multiple injectors. Manufacturers may divide these circuits into groups such as:
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Group A
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Group B
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Group C
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Group D
However, Group C does not have one universal cylinder assignment.
Depending on the vehicle, it may refer to:
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A group of cylinders
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Several injectors sharing a power feed
-
One engine bank
-
A particular injector supply circuit
-
A manufacturer-specific injector circuit
For accurate diagnosis, the affected circuit should be identified using the vehicle's:
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Make
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Model
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Model year
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Engine
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Wiring diagram
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Manufacturer service information
This is important because P2152 does not necessarily identify one specific injector.
How Does a Fuel Injector Work?
A typical fuel injector contains an electrically controlled solenoid or actuator.
When the ECM commands the injector to open, the injector receives the appropriate electrical signal and operates its internal valve. Pressurized fuel is then delivered into the engine.
The ECM controls injector operation based on information from several sensors, including:
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Crankshaft position sensor
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Camshaft position sensor
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Mass airflow sensor
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Manifold pressure sensor
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Throttle position sensor
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Engine coolant temperature sensor
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Oxygen sensors
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Fuel-pressure sensors
The injector needs both proper electrical operation and adequate fuel pressure.
If the electrical supply is interrupted, the injector may not open even when fuel pressure is normal.
Symptoms of P2152
Symptoms depend on how many injectors are affected and whether the open circuit is permanent or intermittent.
Check Engine Light
The Check Engine Light is commonly illuminated when P2152 is stored.
Engine Misfire
An injector without electrical power may fail to deliver fuel to its cylinder.
Possible signs include:
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Engine shaking
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Uneven combustion
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Hesitation
-
Rough running
Rough Idle
The engine may vibrate or run unevenly at idle.
Hard Starting
If the affected injector group is important to engine startup, the vehicle may require extended cranking.
In severe cases, the engine may not start.
Poor Acceleration
The vehicle may hesitate or lack power when accelerating.
Reduced Engine Power
The ECM may activate a protective operating mode if the injector problem is severe.
Engine Stalling
If enough injectors are affected, the engine can stall.
Poor Fuel Economy
Incorrect or incomplete fuel delivery can reduce combustion efficiency.
Engine Hesitation
The vehicle may hesitate under acceleration or load.
Increased Exhaust Emissions
Incomplete combustion can increase exhaust emissions.
Engine Vibration
One or more non-functioning cylinders can cause noticeable vibration.
Fuel Smell
Depending on the injector control strategy and fault condition, abnormal combustion may produce a fuel smell.
Multiple Warning Lights
Some vehicles may activate additional warning lights when severe engine-performance problems occur.
These may include:
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Reduced-power warning
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Traction-control warning
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Stability-control warning
Common Causes of P2152
Broken Injector Supply Wiring
A broken power wire can completely interrupt injector operation.
Possible causes include:
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Engine vibration
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Harness movement
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Heat exposure
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Chafing
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Corrosion
-
Previous repairs
-
Accidental damage
A conductor can break internally while the outer insulation still looks intact.
Disconnected Injector Connector
An injector connector that is not fully seated can interrupt electrical power.
This can occur after:
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Injector replacement
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Engine repairs
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Intake-system work
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Engine removal
-
Fuel-system service
-
Wiring repairs
Blown Injector Fuse
Many vehicles protect the injector supply circuit with a fuse.
If the fuse opens, power may be lost to several injectors.
Possible causes include:
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Shorted injector
-
Shorted wiring
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Damaged harness
-
Electrical overload
The cause of the blown fuse must be identified before simply installing another fuse.
Faulty Injector Relay
Some vehicles use a relay to provide power to fuel injectors.
A failed relay can cause:
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Complete loss of injector power
-
Intermittent injector operation
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Open supply circuit
-
Electrical voltage problems
Corroded Electrical Connectors
Corrosion can interrupt the injector power supply.
Look for:
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Green or white corrosion
-
Oxidized terminals
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Water intrusion
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Loose pins
-
Poor terminal tension
Loose Electrical Connection
A loose connection can interrupt the injector supply circuit.
Potential locations include:
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Injector connectors
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Fuse box
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Relay socket
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Battery connections
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Power-distribution connections
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ECM connectors
Damaged Fuse-Box Terminal
A damaged fuse or relay terminal can interrupt power even when the fuse and relay themselves are functional.
Possible causes include:
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Heat damage
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Corrosion
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Loose terminal tension
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Water intrusion
-
Electrical overload
Damaged Engine Wiring Harness
The injector harness operates in a harsh environment.
It can be damaged by:
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Exhaust heat
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Engine movement
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Vibration
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Oil contamination
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Moisture
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Abrasion
Inspect the harness carefully around hot or moving components.
Short Circuit Causing Fuse Failure
A short circuit may cause the injector fuse to open.
After the fuse fails, the injector supply circuit can appear to be an open circuit.
Possible sources include:
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Chafed wiring
-
Melted insulation
-
Shorted injector
-
Incorrect aftermarket wiring
Faulty Fuel Injector
A fuel injector can develop an internal electrical fault.
Possible failures include:
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Internal open circuit
-
Internal short circuit
-
Abnormal coil resistance
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Damaged solenoid
However, P2152 should not automatically be interpreted as a failed injector.
The shared power circuit should be tested first.
Incorrect Injector Installation
Incorrect installation can cause an open circuit.
Possible problems include:
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Connector not locked
-
Damaged connector terminal
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Incorrect injector
-
Wiring pulled during installation
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Harness incorrectly routed
Poor Engine or Chassis Ground
A poor ground can cause abnormal electrical behavior in the injector system.
Inspect:
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Battery negative cable
-
Engine ground strap
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Chassis grounds
-
ECM ground circuits
Power-Distribution Problems
The injector supply may pass through a fuse box, relay module, or power-distribution unit.
Possible problems include:
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Burned contacts
-
Corroded terminals
-
Water intrusion
-
Loose connections
-
Internal power-distribution failure
Aftermarket Electrical Modifications
Modified vehicles may develop injector circuit problems after electrical or engine modifications.
Possible sources include:
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Aftermarket ECU
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Engine swap
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Modified injector harness
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Performance fuel system
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Injector adapters
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Additional electrical equipment
ECM/PCM Problem
The ECM/PCM is responsible for controlling and monitoring the fuel injection system.
An ECM/PCM fault is possible, but it is generally less common than:
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Wiring problems
-
Fuse failures
-
Relay faults
-
Connector problems
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Power-distribution faults
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Injector electrical faults
The control module should only be considered after the external circuit has been thoroughly tested.
Vehicles Commonly Affected by P2152
P2152 can occur on many OBD-II vehicles equipped with electronically controlled fuel injectors and manufacturer-defined injector groups.
Examples can include:
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Ford F-150
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Ford Mustang
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Ford Explorer
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Ford Escape
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Ford Fusion
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Chevrolet Silverado
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Chevrolet Tahoe
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Chevrolet Suburban
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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 Ram
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Dodge Charger
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Dodge Challenger
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Jeep Grand Cherokee
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Jeep Wrangler
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Toyota Tundra
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Toyota Sequoia
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Toyota Tacoma
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Nissan Titan
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Nissan Armada
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Nissan Pathfinder
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Honda Pilot
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Honda Accord
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Honda Civic
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BMW 3 Series
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BMW 5 Series
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Mercedes-Benz E-Class
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Volkswagen Passat
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Audi A4
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Audi A6
This list is not exhaustive.
Important: The exact injectors assigned to Group C can vary by manufacturer, engine, and model year. A vehicle-specific wiring diagram should always be used to determine which injectors and power circuits are involved.
How Is P2152 Diagnosed?
The objective of diagnosis is to determine exactly where the electrical supply to Group C is interrupted.
Scan for Additional Trouble Codes
Start with a complete diagnostic scan.
Look for:
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P2152
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P2153
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P2154
-
P2155
-
P2156
-
P2157
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Other injector circuit codes
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Cylinder misfire codes
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Fuel-system codes
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Battery-voltage codes
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Charging-system codes
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Communication codes
Additional codes may reveal whether the problem is isolated to Group C or part of a larger electrical issue.
Check Freeze-Frame Data
Review the conditions present when P2152 was stored.
Useful parameters include:
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Engine RPM
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Vehicle speed
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Battery voltage
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Engine load
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Coolant temperature
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Fuel-system status
This can help determine whether the fault occurs during startup, acceleration, idle, or another operating condition.
Identify Fuel Injector Group C
Use the vehicle-specific wiring diagram to determine:
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Which injectors belong to Group C
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Where their power supply originates
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Which fuse protects the circuit
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Which relay supplies power
-
Where the wiring enters the engine harness
-
Which ECM/PCM terminals are involved
This step is essential before replacing components.
Check the Injector Fuse
Inspect the fuse associated with the Group C supply circuit.
If it is blown:
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Do not repeatedly replace it.
-
Inspect the injector wiring.
-
Test the affected injectors.
-
Check for shorts.
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Inspect the relay and power-distribution system.
Test Injector Relay Operation
If the vehicle uses an injector relay, check:
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Relay input voltage
-
Relay output voltage
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Relay control
-
Relay contacts
-
Voltage drop
A relay can fail internally while looking normal from the outside.
Measure Injector Supply Voltage
With the circuit tested under the manufacturer's recommended conditions, measure voltage at the affected injector supply.
Compare it with:
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Battery voltage
-
Other injector groups
-
Manufacturer specifications
If there is no voltage at Group C, trace the circuit backward toward the fuse, relay, and power-distribution system.
Perform a Continuity Test
With the circuit safely isolated according to manufacturer procedures, check continuity through the relevant supply wiring.
An open reading may identify:
-
Broken wire
-
Disconnected connector
-
Damaged terminal
-
Fuse-box problem
-
Harness interruption
Perform Voltage-Drop Testing
Voltage-drop testing is useful for identifying high-resistance connections.
Test relevant:
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Power wires
-
Fuse connections
-
Relay contacts
-
Connectors
-
Ground circuits
A basic continuity test may show a circuit as connected even though it cannot carry the required current properly.
Inspect Injector Wiring
Inspect the entire Group C harness for:
-
Broken wires
-
Chafing
-
Melted insulation
-
Exposed conductors
-
Corrosion
-
Poor splices
-
Previous repairs
-
Incorrect routing
Pay particular attention to areas close to exhaust components.
Inspect Injector Connectors
Check all affected injector connectors for:
-
Loose terminals
-
Bent pins
-
Corrosion
-
Water intrusion
-
Broken locking mechanisms
-
Poor terminal tension
Check for a Short Circuit
If the injector fuse is blown, check the circuit for a short before replacing the fuse.
Inspect:
-
Injector supply wires
-
Injector coils
-
Harness routing
-
Aftermarket wiring
Test Individual Injectors
Where appropriate, test the affected injectors for:
-
Coil resistance
-
Current draw
-
Electrical operation
-
Actuation response
Compare the results with manufacturer specifications.
Do not use a generic injector resistance value, because specifications differ between engines.
Check Injector Control Signals
Appropriate diagnostic equipment can be used to inspect injector control signals.
This can help distinguish between:
-
Supply-circuit problems
-
Injector faults
-
Wiring faults
-
ECM/PCM driver problems
Check Battery and Charging System
Verify that the vehicle's electrical system is operating correctly.
Check:
-
Battery condition
-
Battery terminals
-
Alternator output
-
Charging voltage
-
Ground connections
A weak electrical system can contribute to multiple injector-related faults.
Check ECM/PCM Power and Grounds
Verify proper:
-
Battery power
-
Ignition power
-
ECM/PCM grounds
An unstable ECM power or ground circuit can create misleading diagnostic symptoms.
Check for Aftermarket Modifications
Inspect modifications involving:
-
ECU
-
Fuel injectors
-
Engine harness
-
Fuel system
-
Performance electronics
Incorrect wiring modifications can interrupt the Group C supply circuit.
How to Fix P2152
The correct repair depends on the cause confirmed during diagnosis.
Repair Broken Wiring
Repair or replace damaged injector supply wires.
The repaired harness should be properly protected and routed away from heat, sharp edges, and moving components.
Reconnect or Replace Damaged Connectors
If an injector connector is loose or disconnected, reconnect it correctly.
Replace damaged terminals or connector housings when necessary.
Replace a Blown Fuse After Finding the Cause
If the injector fuse is blown, determine why it failed before installing a new fuse.
Once the underlying short or excessive-current problem has been repaired, install the correct fuse.
Replace a Faulty Injector Relay
If testing confirms a defective relay, replace it with the correct component.
Repair Fuse-Box or Power-Distribution Problems
Repair burned, corroded, loose, or damaged power-distribution connections.
Repair High-Resistance Connections
Repair or replace poor electrical connections that cause excessive resistance.
Repair a Short Circuit
Locate the damaged wiring or component responsible for the short and repair it.
Replace a Faulty Fuel Injector
If an injector is confirmed to have an internal electrical fault, replace it with the correct injector.
Restore Proper Ground Connections
Repair or clean:
-
Battery grounds
-
Engine grounds
-
Chassis grounds
-
ECM grounds
Correct Aftermarket Wiring
Restore incorrectly modified injector wiring to the appropriate manufacturer configuration.
Repair or Replace the ECM/PCM
The ECM/PCM should only be considered after the injector supply circuit, fuse, relay, wiring, connectors, injectors, power distribution, and grounds have been properly tested.
What Happens If P2152 Is Ignored?
Ignoring P2152 can lead to continued engine-performance problems.
Possible consequences include:
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Engine misfires
-
Rough running
-
Hard starting
-
Engine stalling
-
Reduced engine power
-
Poor acceleration
-
Increased fuel consumption
-
Increased emissions
-
Catalytic-converter damage from prolonged misfires
-
Additional electrical problems
If several injectors lose their common power supply, the engine may run extremely poorly or fail to start.
Can You Drive With P2152?
Driving with P2152 is not recommended for an extended period, particularly if the engine is misfiring.
A short trip may be possible if:
-
The engine starts normally.
-
The engine runs smoothly.
-
There is no severe misfire.
-
The Check Engine Light is not flashing.
-
Vehicle performance remains normal.
The fault should nevertheless be diagnosed as soon as possible.
Avoid driving if you experience:
-
Severe engine shaking
-
Flashing Check Engine Light
-
Major loss of power
-
Repeated engine stalling
-
Strong fuel smell
-
Multiple warning lights
A flashing Check Engine Light can indicate a severe misfire that may damage the catalytic converter.
Is P2152 a Serious Code?
P2152 is generally considered a moderate-to-high severity diagnostic trouble code, depending on how many injectors are affected.
The code itself does not necessarily indicate internal engine damage.
However, an open injector supply circuit can prevent one or more cylinders from receiving the correct fuel delivery.
This can cause:
-
Misfires
-
Poor combustion
-
Reduced engine performance
-
Increased emissions
-
Catalytic-converter damage
-
Engine stalling
If the entire Group C injector supply is interrupted, the vehicle may become difficult or impossible to drive.
How to Prevent P2152
Injector circuit problems cannot always be prevented, but proper maintenance can reduce the risk.
Recommended practices include:
-
Inspect engine wiring during routine service.
-
Protect injector wiring from exhaust heat.
-
Keep injector connectors clean and dry.
-
Maintain battery terminals.
-
Maintain engine and chassis grounds.
-
Repair damaged wiring promptly.
-
Secure harnesses away from moving components.
-
Use the correct injectors.
-
Use the correct fuses and relays.
-
Inspect injector connectors after engine repairs.
-
Address charging-system problems promptly.
-
Avoid poorly designed electrical modifications.
-
Do not ignore Check Engine Light warnings.
P2152 vs. Related Injector Codes
| Code | General Description |
|---|---|
| P2151 | Fuel Injector Group "C" Supply Voltage Circuit High |
| P2152 | Fuel Injector Group "C" Supply Voltage Circuit/Open |
| P2153 | Fuel Injector Group "C" Supply Voltage Circuit Low |
| P2154 | Fuel Injector Group "C" Supply Voltage Circuit High |
| P2155 | Fuel Injector Group "D" Supply Voltage Circuit/Open |
| P2156 | Fuel Injector Group "D" Supply Voltage Circuit Low |
| P2157 | Fuel Injector Group "D" Supply Voltage Circuit High |
The important distinction is that P2152 indicates an open or interrupted supply circuit for Fuel Injector Group C.
P2153 indicates a low-voltage condition, while P2154 indicates a high-voltage condition.
Because generic code databases can contain inconsistent descriptions for closely related manufacturer-specific codes, the exact definition should always be verified against the vehicle's service information.
Final Thoughts
The P2152 Fuel Injector Group "C" Supply Voltage Circuit/Open diagnostic trouble code indicates that the ECM/PCM has detected an interruption or open circuit in the electrical supply associated with Fuel Injector Group C.
Common causes include:
-
Broken injector wiring
-
Disconnected injector connectors
-
Blown injector fuse
-
Faulty injector relay
-
Corroded terminals
-
Loose electrical connections
-
Damaged fuse-box terminals
-
Damaged engine harness
-
Short circuits that caused a fuse to open
-
Faulty fuel injector
-
Poor engine or chassis grounds
-
Power-distribution problems
-
Incorrect aftermarket wiring
-
ECM/PCM faults
The correct diagnostic process begins by identifying exactly which injectors and circuit the manufacturer defines as Group C. The technician should then check the fuse and relay, verify injector supply voltage, perform continuity and voltage-drop tests, inspect the wiring and connectors, check for shorts, test the affected injectors, and verify ECM/PCM power and ground circuits.
P2152 does not automatically mean that a fuel injector needs to be replaced. A broken wire, disconnected connector, blown fuse, faulty relay, damaged fuse-box terminal, or power-distribution problem can all interrupt the injector supply.
Finding the exact location of the open circuit is the key to repairing P2152 correctly and restoring reliable fuel-injection operation.
