P2138 OBD Error Code: Problem & Solutions

<<See All OBD Codes

You just found out that your vehicle has the P2138 code set, well don’t worry. We will inform you all about the code, what it means and also how to get rid of it. You may be bothered by the fact that your vehicle in limp mode and you’re having other issues with gaining speed on your vehicle. Well this code is set by the Engine Control Module when it detects an issue within the D and/or E circuits present in the throttle position sensor on your car.

This throttle position sensor of your vehicle is located on the Throttle body intake manifold, the pedal position sensor is part of the accelerator pedal assembly. The job of both these sensors is to inform the Powertrain Control Module of your vehicle about how fast the driver wants to go and how quickly it wants to achieve that speed. The PCM module may detect an issue with the sensor or the circuit of the sensors, and based on that set the code. The reason why the vehicle enters limp mode is to basically keep the driver as well as the car safe. When the vehicle is in limp mode it may not be able to go over 20 mph speed.

What causes this problem with the Throttle/Pedal Pos Sensor Voltage Correlation DTC?

• Defective throttle body motor
• Damage of the connector or wiring associated with the throttle body motor
• Problem with the throttle position sensor
• Malfunction of the ECM module

1. Powertrain Control Module - The brain of your vehicle has to always be in top condition, otherwise things can go haywire. If you have noticed troubles with the PCM, try to repair otherwise replace easily with Parts Avatar. Order from the comfort of your home and have it delivered right to your doorstep in few days.
2. Throttle position sensor - This is responsible for monitoring the throttle position of the vehicle. A malfunction of this sensor can cause the P2138 code to set. It is hence important to fix any damages via repairs or opt for replacement. Buy them online from PartsAvatar and buy good quality products, for a wide range of price from different brands all in one place.
3. Accelerator pedal position sensor - The APP sensor shows the position of the accelerator pedal to the engine control unit PCM. Accordingly the vehicle will move. Having a faulty sensor can cause the P2138 code to set. Try to repair or replace it as needed. PartsAvatar has a wide range of APP sensors, you can avail free shipping on order s valuing over CAD 99$.
4. Engine Control Module - The ECM module is responsible for controlling the fuel mixture, ignition timing, variable cam timing and emissions control etc. of your vehicle so if it’s not functioning properly it can result in the P2138 code setting. It’s best to either repair or replace it and get rid of the code. You can buy required parts online at PartsAvatar Canada.
5. Switch Circuit - It is important that all circuitry be working well in a vehicle, damages in the circuit system are the prime causes for OBD errors to set. In the case of P2138 you can easily solve your issues by repairing or replacing any issues with the switches and circuits. Buy them online from PartsAvatar and buy good quality products, for a wide range of price from different brands all in one place.

Have you ever wondered why is it so important to know the symptoms of the problem? Well, it is extremely essential to know the symptoms of the problem in order to detect it. Keeping this in mind, let’s throw some light on few common symptoms of OBD error code P2138

Common Symptoms

• Vehicle stalls
• Vehicle doesn’t start easily
• Problems with acceleration
• Check engine light it on
• Vehicle is in limp mode

Once you know the symptoms of your vehicle’s problem, it becomes easy to detect it and get started with solving it. So, next on our list is few common steps to correct this issue with your vehicle’s

• Repair or replace the throttle body motor or assembly
• Repair or replace any damaged wiring associated with throttle body motor or position sensor
• Repair or replace faulty diagnostic tools
• Repair or replace Engine Control Module

If you need parts to fix this issue, you no longer need to search for them. We at PartsAvatar Canada have an extensive range of auto parts in stock from you like pcm, ecm, circuit switching, position sensor, pedal position ranging from all replacement parts to all interior and exterior parts.

Here are some steps which you should follow in order to diagnose this fault code P2138:

Begin the diagnosis by locating the throttle body, it is under the hood of the vehicle. To know the exact location you can refer your specific vehicles Technical Service Bulletins. Ther connector pinout charts and other sources will help you locate components correct throughout the diagnostic procedure.

After locating the throttle body, examine the throttle body motor and the throttle position sensor, be careful and make note of any electrical damages, faulty circuitry etc. You will have to repair or replace these as needed. After doing this, clear the codes and go on a test drive to see if the code returns. If it returns then you will have to continue your diagnosis, by checking the throttle body motor and throttle position sensor for how they’re functioning, you can refer the procedure mentioned in the TSB for this. If that also doesn't help resolve the code, then the last part to check is the ECM, any fault in the ECM may require repairs or replacement. In the case of replacement, programming will also be required, so it’s important that a trained diagnostician does the programming.

Common mistakes when diagnosing the P2138 code

• Prematurely replacing the throttle position sensor when the issue may be with the circuitry and electrical wires
• Not following the diagnostic steps properly and proceeding to replacing other parts