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P2486 Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 5
P2486 is a generic OBD-II diagnostic trouble code that indicates the Engine Control Module (ECM) has detected an abnormally low voltage or signal from the Exhaust Gas Temperature (EGT) Sensor located at Bank 2 Sensor 5. This means the sensor is reporting a value that is lower than the acceptable operating range, or the ECM believes the circuit voltage is too low to represent a valid exhaust gas temperature reading.
Exhaust Gas Temperature sensors are essential for monitoring the temperature of exhaust gases and protecting critical emission control components such as the Diesel Particulate Filter (DPF), catalytic converter, turbocharger, and Selective Catalytic Reduction (SCR) system. If Sensor 5 on Bank 2 reports an unrealistically low signal, the ECM may limit engine functions or suspend emission system operations to prevent damage.
What Does P2486 Mean?
Modern diesel engines and many turbocharged gasoline engines use multiple EGT sensors positioned at various points along the exhaust system.
These sensors monitor temperatures before and after components such as:
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Turbocharger
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Diesel Oxidation Catalyst (DOC)
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Diesel Particulate Filter (DPF)
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SCR catalyst
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Catalytic converter
Bank 2 refers to the side of the engine opposite Cylinder 1 on V-type engines.
Sensor 5 is typically located toward the rear section of the exhaust system. The exact location depends on the manufacturer and engine design.
When the ECM detects that the sensor voltage remains below the expected operating range, it stores code P2486 and illuminates the Check Engine Light.
Common Symptoms of P2486
The symptoms vary depending on the vehicle and the severity of the fault.
Common symptoms include:
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Check Engine Light illuminated
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Malfunction Indicator Lamp (MIL) on
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Reduced engine power
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Limp mode activation
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DPF regeneration disabled
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Increased exhaust emissions
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Poor fuel economy
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Excessive soot accumulation in diesel engines
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Failed emissions inspection
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Emission system warning messages
Some vehicles continue to drive normally despite the stored code.
Common Causes of P2486
A low circuit signal is usually caused by an electrical problem or a defective sensor.
Faulty exhaust gas temperature sensor
The sensor may internally fail and continuously report an unusually low signal.
Short to ground
A wire contacting the chassis or engine may pull the sensor voltage below its normal operating range.
Damaged wiring
The exhaust environment exposes wiring to extreme temperatures that may cause:
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Melted insulation
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Burned wiring
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Chafed wires
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Broken conductors
Corroded connector
Corrosion increases electrical resistance and may reduce the sensor signal.
Loose electrical connection
Poor connector contact may produce intermittent low-voltage readings.
Water intrusion
Moisture entering the connector may damage terminals and reduce signal quality.
Damaged wiring harness
Road debris, vibration, or improper repairs may damage the sensor harness.
ECM fault
Although uncommon, an internal ECM problem may incorrectly interpret the sensor signal.
Vehicles Commonly Affected by P2486
P2486 is most commonly found on diesel vehicles equipped with advanced emission control systems.
Frequently affected vehicles include:
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Ford F-Series Power Stroke
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Ford Transit Diesel
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Chevrolet Silverado Duramax
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GMC Sierra Duramax
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Ram 2500 Cummins
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Ram 3500 Cummins
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Mercedes-Benz Sprinter
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Mercedes-Benz GLS Diesel
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BMW X5 Diesel
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BMW 5 Series Diesel
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Audi Q7 TDI
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Volkswagen Touareg TDI
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Volkswagen Amarok
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Land Rover Discovery
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Range Rover Sport Diesel
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Jeep Grand Cherokee EcoDiesel
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Nissan Navara
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Isuzu D-Max
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Mitsubishi L200
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Toyota Land Cruiser Diesel
Some turbocharged gasoline engines with multiple EGT sensors may also store this code.
How Is P2486 Diagnosed?
A systematic diagnosis helps determine whether the problem lies in the sensor, wiring, or control module.
Check for additional diagnostic trouble codes
Related codes involving:
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Other EGT sensors
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DPF
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SCR system
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NOx sensors
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Oxygen sensors
can provide useful diagnostic information.
Inspect the wiring harness
Technicians examine the harness for:
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Burned insulation
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Melted wiring
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Pinched wires
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Chafing
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Heat damage
Inspect electrical connectors
Connectors should be checked for:
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Corrosion
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Loose terminals
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Moisture
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Bent pins
Measure sensor resistance
A digital multimeter is used to determine whether the sensor is operating within manufacturer specifications.
Test circuit voltage
Voltage measurements help determine whether the ECM is receiving the proper electrical signal.
Review live scan data
Using a professional scan tool, technicians compare exhaust temperature readings from all EGT sensors.
A faulty Sensor 5 may display:
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Extremely low temperature
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Constant fixed reading
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Unrealistic temperature values
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Temperature that does not change as the engine warms up
How to Fix P2486
The repair depends on the root cause of the low circuit condition.
Common repairs include:
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Replacing the faulty exhaust gas temperature sensor
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Repairing shorted wiring
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Replacing damaged wiring harnesses
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Cleaning corroded connectors
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Repairing loose electrical connections
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Replacing damaged connector terminals
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Repairing heat-damaged wiring
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Eliminating moisture from connectors
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Updating ECM software if recommended by the manufacturer
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Replacing the ECM in rare cases of internal failure
After repairs, the diagnostic code should be cleared and verified through a road test.
Can You Drive With P2486?
The vehicle may remain drivable, but continued operation is not recommended.
An inaccurate exhaust temperature signal can prevent proper operation of emission control systems and may cause the ECM to:
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Disable DPF regeneration
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Reduce engine performance
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Enter limp mode
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Increase exhaust emissions
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Store additional diagnostic trouble codes
Diesel vehicles are particularly vulnerable because interrupted regeneration can eventually lead to DPF blockage.
Is P2486 a Serious Code?
P2486 is considered a moderately serious diagnostic code.
Although it typically does not cause immediate engine damage, ignoring the problem can eventually result in:
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DPF clogging
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Increased soot accumulation
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Reduced engine efficiency
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Higher exhaust emissions
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Additional emission system faults
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Potential catalyst damage
Prompt diagnosis helps prevent more extensive exhaust aftertreatment problems.
How to Prevent P2486
Regular inspection of the exhaust system and electrical components can significantly reduce the likelihood of this fault.
Recommended maintenance includes:
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Inspect exhaust sensor wiring during routine servicing.
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Replace damaged heat shields promptly.
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Secure wiring away from hot exhaust components.
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Clean electrical connectors when corrosion is present.
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Repair damaged wiring immediately.
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Inspect the exhaust system after off-road driving.
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Repair exhaust leaks that expose wiring to excessive heat.
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Investigate Check Engine Lights without delay.
Routine maintenance helps ensure reliable exhaust temperature monitoring and proper operation of the vehicle's emission control systems.
Final Thoughts
P2486 Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 5 indicates that the ECM has detected an abnormally low electrical signal from the fifth exhaust gas temperature sensor on Bank 2. The problem is most commonly caused by a failed sensor, wiring shorted to ground, heat-damaged wiring, corroded connectors, or loose electrical connections. Since accurate exhaust temperature data is essential for protecting the DPF, catalytic converter, turbocharger, and SCR system, this code should be diagnosed and repaired as soon as possible.
Correcting the underlying electrical fault restores accurate exhaust temperature monitoring, allows normal emission system operation, improves engine efficiency, and helps prevent costly damage to exhaust aftertreatment components.
