Skip the auto shop - Our mechanics make house calls

Q: I get trouble code P2138, but I have cleared it and the car works for a while. Now I am getting trouble code P2127 along with P2138.

asked by on

Have had ongoing issues with P2138 , clear , works for a while. Now I am getting P2127 along with P2138 and i dont want to just start throwing parts at it like throttle body, pedal sensor etc.The car goes into reduced power mode and this has been a problem for a while. I checked for any obvious wiring issues like exposed wire etc. I have a feeling you may recommend the dealer for diagnostics but just thought I would check. This particular model you cant replace the sensor on the throttle body, they want you to replace the whole TB. My other concern is that it might be the computer itself might be bad. Any information would be greatly appreciated.

Scott Couser

My car has 73000 miles.
My car has an automatic transmission.

Hi there. The pedal position sensor on the gas pedal has lost signal for the switch ’E’ and ’D’. The code P2138 means that the computer has discovered a malfunction with the pedal sensor.

Check the harness to the gas pedal and see if there is any moisture or debris on the contacts. If there is no debris, then use a digital volt ohm meter (DVOM) and check resistance on the circuits to the sensor with the pedal in up position and down position. If the resistance has no change or very little change, then the sensor needs replacing. If the resistance is strong and seems normal, then check the wiring from the pedal to the computer for any broken or loose wires.

If you need further assistance troubleshooting your vehicle, then seek out a certified technician, such as one from YourMechanic, who can determine what exactly has gone wrong and replace the pedal position sensor if needed.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  • Home
  • Questions
  • I get trouble code P2138, but I have cleared it and the car works for a while. Now I am getting trouble code P2127 along with P2138.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My car alerted me by saying a/c off due to high engine temperature.

Hi there. Check the coolant temperature and see if the engine is overheating. If the engine is overheating, then you want to check the upper radiator hose and see if the temperature is different or the same as the bottom...

Q: Engine wont stay running until warm.

Hi there. Check the fuel filter to see if it's clogged and not pumping enough fuel. If the fuel filter is good, then the fuel injectors could be leaking causing the intake to flood or the spark plugs could have...

Q: How do you install a child car seat?

Your Altima is designed to accommodate a number of different car seat styles. If your car seat does not use the Lower Anchors and Tethers for Children (LATCH) system, you’ll need to use the seat belt to secure the seat...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.