My car is throwing a P2138 code.

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.

Experienced mechanics share their insights in answering this question :
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.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

The TPS is usually mounted on the throttle body (the housing that contains the throttle valve).
The easiest way to reset your throttle position sensor is to unhook the negative cable from your battery for up to five minutes or to remove the fuse for your engine control module.
To recalibrate the ECM and accelerator pedal, the ignition switch must be in the ON position and then the accelerator pedal must be slowly and fully depressed from idle to full throttle. Repeat the procedure three times.
If your accelerator were to stick it would most likely be caused by a floor mat or other object getting jammed under the gas pedal. This could obviously be avoided by keeping your vehicle clear of clutter and making sure floor mats are properly fixed in place.
The accelerator pedal sensor (APS) indicates the position of the accelerator on vehicle models with electronic throttle control. The APS is basically a throttle position sensor (TPS) with a pedal attached.
Accelerometer sensors have the ability to alter obtained physical acceleration from motion or gravity into a voltage output. Accelerometers are widely used to measure inert acceleration due to gravity, the low-frequency module of the acceleration and the dynamic acceleration due to animal movement [36].
Accelerator Pedal Release Position Learning Procedure.

Make sure that the accelerator pedal is fully released. Turn ignition switch “ON” and wait at least 2 seconds. Turn ignition switch “OFF” wait at least 10 seconds. Turn ignition switch “ON” and wait at least 2 seconds.

A P0122 code is the generic OBD-II code defined as “Throttle Pedal Position Sensor/Switch (TPS) A Circuit Low Input.” This code relates to the vehicle`s Engine Control Module (ECM) and TPS Sensor Circuit A output voltage and is triggered when the voltage falls below the sensor`s anticipated range.
Do you have to reset computer after replacing throttle position sensor? After replacing the throttle position sensor in your engine, if the engine light was on and has a pending code, the code should go away. If the code doesn`t, however, then the ECM (engine computer module) will need resetting.
There are two ways in which the P2135 Chevy Silver error code can be fixed. The first one involves removing and dismantling the throttle body to replace it, while the other consists of replacing the entire throttle body assembly.
There are a few repairs that can be done to resolve the error code. First, you can replace the accelerator position sensor. Then, you can see if installing new throttle position sensors fixes the error. If neither of these solutions works, then you can try checking for a fault in the circuits or connections.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Can i retrieve CEL code from car … forgot what code it hade in my car .. put headgasket sealer and i erase the code ..
ANSWER : Once a trouble code is erased, it cannot be retrieved. The engine controller does not have a "recycle bin" like they have on Windows. If the car still has a problem, the code will come back up after some driving. However, the controller will not turn on the CEL until it has seen the malfunction on two separate "trips." A "trip" is a driving cycle where the car is started cold, driven until it is fully warm and through a certain number of accelerations, and shut down. So you might not see the CEL for a couple of days. As for the "head gasket sealer," I wouldn’t hold out too much hope of that solving a problem. At the very best it might put off the symptoms for a short while. If you need help interpreting codes that come up, or solving a head gasket issue, contact Your Mechanic. They can send a technician to your home or office to read the codes on your car and help you decide what to do.

My car is throwing the code p0707 which means transmission range sensor I had another transmission put in same code
ANSWER : Hi, thanks for writing in. The transmission range sensor switch must be physically aligned with the gear selector in order to work properly. This generally involves putting the shifter in the Neutral position, then adjusting alignment of the range sensor switch to the default Neutral position. If they are not aligned, the transmission controller will detect mixed signals from the range switch and the transmission internals – resulting in the P0707 you see. It is also possible that the wiring harness to the range sensor is shorted, or has a poor connection somewhere in that segment of the wiring harness. I would recommend having YourMechanic.com diagnose this issue, provide an accurate assessment of damage, and estimate the cost of repairs.

I put the wrong key in my car and a few weeks later my car just shut down and it will not start I believe it’s the computer but…
ANSWER : Hi there. What had happened is the wrong key set the security to the vehicle. This is to prevent the vehicle from starting with the wrong keys. Try removing the battery cables (+) and (-) for 13 minutes. During that time, put the original key in the ignition and turn it on. Activate everything in the car even though there is no power. Then remove the key and hook up the battery cables. The computer should have reset and reset the security. If the security is still being tripped, then I recommend seeking out a professional, such as one from Your Mechanic, to help you

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.
ANSWER : 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.

Replaced alternator on car 2 times each time shows it’s charging 14v let car run for a little bit then test drive and car voltage
ANSWER : There are reports that the replacement alternators will not communicate with the engine computer and will not charge correctly. I recommend using only the manufacturer approved replacement part. It can be new or remanufactured but approved for use in the vehicle. Some lower cost alternators on the aftermarket will have charging problems since they will not communicate with the ECM on the vehicle and will stop charging.

My car is throwing a P2138 code.
ANSWER : 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.

Oil leaking from under car and "remote control car" sound when car is first started for a few minutes until it warm up.
ANSWER : Hello,
There are a number of things that could make an engine noisy when starting up. Depending on the specific type of sound you are referring to, this will determine how to properly diagnose. If there is a bit of a hissing sound, this may be a sign of a vacuum leak. If this is more of a shrieking sound, this may be a sign of a worn out or out of adjustment serpentine belt. If there is a bit of a howling or growling sound, this may be a sign of a worn out or low on fluid power steering pump. A rattling or pinging sound may be caused by an ignition problem. An engine can ping (or knock) due to an improper combustion process. A "spark knock" is the result of combustion occurring too early. Early combustion can occur from carbon buildup inside the combustion chamber, a lean air/fuel mixture, and advanced ignition timing (spark plug firing too soon). A clattering type sound may be a result of improper lubrication in the valve train which could be a more serious problem and should be addressed as soon as possible. I would suggest having an expert from YourMechanic come to your location to diagnose and inspect your vehicle to ensure everything is in proper working order.

Can my car be driven safely on a limited basis with the car diagnostic codes listed below in the description?
ANSWER : All of these codes (P0121, P0638, P2106, and P2110) point specifically to problems with the throttle control systems. This means that it will be unsafe to drive at all until it is diagnosed properly and repaired. You may need a new throttle body assembly. I absolutely do not recommend driving it.

If you need assistance with getting this fixed, consider contacting a certified technician who has the necessary tools and experience to properly diagnose your trouble codes. Once this is done, an accurate repair can be made and your car will be suitable for the road once again.