Q: My car is throwing a P2138 code.

asked by on November 23, 2016

My car has a P2138 code. CC blinking and CEL on solid. Car goes into limp mode and engine idles between 2500-3000 RPM. I don't know what to replace or check. I was told it might be the pedal assembly? My CC does not work either. No matter what speed, temperature, etc.

My car has 193000 miles.
My car has an automatic transmission.

Check Engine Light is on Inspection $79.99 - $89.99 Get a Quote

Hi there. Here are some potential causes for this code: •The wiring connector or "pig tail" on the throttle body could have a poor connection. The female terminals on the pigtail corrode or pull out of the connector. •Possible shorting to ground. •The electronic throttle body is faulty. •The accelerator pedal sensor or its wiring failed. •The engine management computer has failed. The computer "correlates" the signals from the accelerator pedal position sensor and the throttle position sensor. When there is a discrepancy, the code is set. In your case it sounds like there could be short in one of the sensors, assemblies, or the harness as the vehicle is entering limp mode. I suggest having a qualified technician perform an inspection to avoid replacing unnecessary parts. Your Mechanic has several available technicians that can assist you with a check engine light inspection.

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

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

What others are asking

I wanna buy this bmw 325i but the airbag and seat belt lights are on on the dash. Do you think i should get?? Its accident free

Hi there. You might find it very helpful and cost effective to have one of our mobile mechanics complete a pre car purchase inspection; so they can inspect the vehicle and determine the condition of the vehicle and whether it's...

Car is making a speed related sound over 20mph almost like something is dragging or rubbing. 2008 Subaru Outback

Hi there - quite likely, this is a wheel bearing noise. Your own diagnostics actually narrow it to this "speed-related, but not while shifting (accelerating)" - well done! The bearing might not make noise while suspended - because it isn't...

door lock problem

Hi there: Based on your question and the information listed, it's possible that you've got an exposed wire somewhere in your vehicle that is causing a short with your door locking mechanism. Sometimes this issue is caused by a faulty...

2006 Audi brake pedal hard replaced booster with no results

To begin with the booster needs a vacuum source. You said you replaced the line, but there is a check valve in the line, it is probably installed at the booster end of the line. It looks like just an...

Car died, but restarts immediately

Your 2006 BMW 545i may be losing main power supply to the main fuse power module from the battery. If you lose the connection, it would also cause the loss of radio and clock memory. Check the battery connections and...

Clutch pedal doesn't come back up

You are experiencing the effects of a worn out clutch and pressure plate. It feels like there is a lot of play because the clutch disc is worn out. The pedal is not returning because the pressure plate springs are...

Car starts bucking/jerking when letting off gas on the highway

This is very likely a throttle issue. There is an idle control module (or similar setup depending on your make and model) that is located on the throttle body which helps the gas regulation during these moments. Otherwise, without a...

my trans malfunction warning light came on and 1st and second gear is slow. what can i do

When a module illuminates a warning light, generally there is a fault code that accompanies it. there can be many reasons for the concern like a low fluid level or a failing internal transmission component. Fluid leaks are common as...

I have a 2006 Jeep Commander and I just realized something leaking on my passenger side floor board and my car runs hot.

Hi Donna. Thanks for contacting us today. What you are describing is typically caused by a heater core that is damaged or a supply line that has ruptured or has a progressive leak. Either way, this would be a source...

Related articles

The Best Used Cars to Buy If You're a Dog Breeder or Trainer
These These days, dogs are more and more likely to travel with people than ever before. After all, what dog doesn’t ride in a car? As a breeder and trainer though, you’re probably more likely to carry along dogs than...
The Best Used Cars to Buy If You're a Fisherman
What What do anglers look for, specifically, in their vehicles? Lots of room, plenty of cargo space, and sometimes, the ability to handle rough terrain. Some fishermen also want the option of towing a boat. With that in mind, we...
The Best Used Cars to Buy If You Just Had a Baby
Having Having a baby will completely change your life. Your activities and hobbies will change. Your sleeping patterns will change. Chances are good that you’ll also be looking for a change in vehicles. You need to ensure that your car...