Skip the auto shop - Our mechanics make house calls

P2031 OBD-II Trouble Code: Exhaust Gas Temperature (EGT) Sensor Circuit Bank 1 Sensor 2

Check Engine Light

P2031 code definition

Exhaust Gas Temperature (EGT) Sensor Circuit Bank 1 Sensor 2

What the P2031 code means

P2031 is an OBD-II generic code for when the Engine Control Module (ECM) detects that, during the exhaust gas temperature (EGT) sensor warm up after the engine is cold started, the sensor does not register the specified temperature range during the testing timeframe.

What causes the P2031 code?

  • The ECM monitors the EGT for an exhaust temperature rise after the engine is started cold. If the temperature is not in a specified temperature range within a certain amount of time, then the ECM flags a fault and turns on the Check Engine Light.

  • The EGT cannot register the exhaust system temperature due to a faulty sensor or wiring.

  • The EGT cannot register the correct exhaust temperature due to soot or ash build up on the sensor, or there is an exhaust leak.

What are the symptoms of the P2031 code?

  • The Check Engine Light will be illuminated and the code for a fault in the EGT sensor circuit will be set in the ECM.

  • The engine may run too rich or lean, depending on manufacturer's failure strategy.

  • The failure mode will depend on other symptoms encountered.

  • The exhaust may be leaking before the sensor.

How does a mechanic diagnose the P2031 code?

  • Scans and documents the codes in the ECM and looks at the freeze frame data for failures

  • Checks the EGT sensor and wiring for damage and listens for exhaust leaks near the sensor

  • Verifies the exhaust temperature of the EGT sensor 1 for bank 1 and compares it to the EGT sensor 2 for bank 1 and replaces the sensor if it is not reading as specified.

Common mistakes when diagnosing the P2031 code

  • Not removing the EGT sensor and checking for excessive soot or ash on the sensor
  • Failing to clean the EGT sensor and retesting before replacing it

How serious is the P2031 code?

Code P2031 is an indication that the ECM has detected the EGT sensor is not reading correctly and the sensor may be indicating a more major problem in the engine causing the wrong temperature readings during engine warm up.

What repairs can fix the P2031 code?

  • Removing and cleaning excessive soot and ash off of the EGT sensor
  • Replacing the EGT sensor or repairing the wiring to it
  • Repairing an exhaust leak in the pipe connection above the sensor

Additional comments for consideration regarding the P2031 code

Code P2031 is for an exhaust temperature sensor on some diesel engines and indicates the sensor did not reach a specific temperature within about a five minute timeframe. Excessive soot or ash build up can insulate the sensor from indicating an accurate temperature. Cleaning the sensor may fix most problems.

Need help with a P2031 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance Related Trouble Codes: P2158: Vehicle Speed Sensor B P2160: Vehicle Speed Sensor B Circuit Low P2161:...


Related questions

Q: Check Engine Light on Dodge Ram 1500 with code P0073

Check the condition of the harness that plugs into the sensor to ensure that the sensor is staying plugged in. If you are saying that the sensor is functioning and the voltage does change, then it is possible that your...

Q: Showing check engine,and loosing power. 2005 Toyota Isis

Hello - loss of power can be caused by many failures. The first task is to determine the problem codes being set with the Check Engine light. This will guide diagnosis, and avoid unnecessary replacement of parts. I would recommend...

Q: O2 sensor

Hey there. Oxygen sensors are located in the exhaust system, typically before and after the catalytic converter. Bank 1 is found on the driver's side - if the engine is a V6 or V8. On a 4 cylinder, it would...