Causes and Fixes Of P2135 Code: Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation

p2135 code

Many sensors are used in modern vehicles, which transmit information about the functioning of various parts to the engine control module. But sometimes these sensors provide incorrect information to the ECM or fail to provide any information due to some failure.

Thereby, the engine control module displays sensor related fault codes. Similarly, there is a P2135 OBD code, which indicates a voltage problem between the throttle position sensor and the accelerator position sensor.

So whenever the check engine light comes on in your vehicle and the P2135 trouble code displays when scanned, you should know about its causes and solutions.

What Does P2135 Code Mean?

P2135 is an OBD-II code that indicates a “throttle/pedal position sensor/switch A/B voltage correlation” problem. This code is triggered when the ECM detects a discrepancy between the voltage readings from the throttle position sensor and the accelerator pedal position sensor.

Whenever the P2135 code is displayed in the scanner, it should be repaired as soon as possible. Because it can impair engine performance and sometimes cause engine acceleration problems.

How Do Throttle Position & Acceleration Pedal Sensor Work?

The throttle position sensor generates a voltage signal to the vehicle’s ECM according to the position of the throttle valve.

The more the throttle body valve opens during acceleration, the more voltage the ECM provides. The accelerator pedal position sensor plays an important role in this function.

How much is the accelerator pedal of a vehicle being pressed? The acceleration pedal position sensor signals this position to the ECM and adjusts fuel delivery and ignition timing based on this signal, resulting in successful engine acceleration.

Possible Causes Of P2135 OBD Trouble Code

  • Faulty Throttle Position Sensor (TPS)
  • Faulty Pedal Position Sensor (PPS)
  • Wiring problem between TPS, PPS, and Engine Control Module (ECM)
  • A Malfunction Throttle Actuator Control Motor (TACM)
  • A faulty engine control module (ECM)
  • Throttle body vacuum leak

A diagnostic scanner must be used first to diagnose the P2135 fault code. so that you can get an accurate idea about the causes of the P2135 code.

Symptoms Of P2135 OBD Trouble Code

  • Check engine light illuminated
  • Hesitation during acceleration
  • Low fuel efficiency
  • Throttle pedal sticking or not returning to the idle position
  • Engine power loss
  • Loss of engine performance
  • Engine no-start or hard-start
  • Engine RPM higher or lower than normal
  • Engine stalling
  • Deceleration of the engine on the go
  • Accelerator pedal unresponsive

How To Diagnose P2135 Code?

To diagnose the P2135 fault code, you must follow the following procedure:

  • If you notice symptoms related to P2135 code, the first thing you should do is scan the vehicle’s system with an OBD scanner so that you can find the cause of the problem related to P2135 fault code and diagnose it accurately.
  • First of all, inspect the sensor for damage and also check the wiring connected to the sensor. Where to check the sensor for proper voltage and ground connection.
  • Inspect the valve and gasket of the throttle body. So that sticking of the valve on the throttle body and vacuum leakage of the throttle body can be detected.
  • Next you inspect the actuator control motor of the throttle body. Sometimes failure of this motor may also cause the P2135 code to display.
  • Finally, you check the engine control module. Because many faulty ECMs can also cause the P2135 code.
  • If you are not comfortable or inexperienced in vehicle troubleshooting and repair, you should seek assistance from a professional mechanic.

How To Fix P2135 OBD-II Trouble Code?

Repairing the P2135 code depends on the cause of the problem. However, you can repeat the following process to repair it.

1. Replace Faulty TPS or Accelerator Pedal Sensor

If you find any problems with the throttle position sensor or acceleration pedal position sensor associated with code P2135. Then you have to replace the sensors. Because both of these sensors can go bad, they can be the main cause of the P2135 code.

2. Repair or Replace TPS & APP Sensor Wiring

The signal of the data related to any sensor of the vehicles reaches the ECM through wiring. But sometimes the wire related to the throttle position sensor or the acceleration pedal position sensor can get damaged.

Due to this, these sensors are unable to provide data to the ECM, and the ECM starts displaying the P2135 code. So check the wiring and repair it or replace it with a new one.

3. Repair or Replace Faulty ECM

A faulty ECM can be the reason for a vehicle to display any fault codes or cause any vehicle functions to not work. So after checking this, repair or replace the faulty ECM.

4. Clean or Replace Throttle Body

Over time, the throttle body of a vehicle’s engine may get clogged due to dirt. which can cause this code to appear. So clean the throttle body or replace it.

5. Contact Mechanic

If you do not have any experience with checking and diagnosing code P2135, So you can contact any vehicle professional mechanic.


Here are some FAQs related to P2135 OBD code, which will help in making this article helpful content for the users.

How Do I Reset My Accelerator Pedal Sensor?

You may first need to disconnect the negative battery cable for 5 to 10 minutes or remove the ECM main fuse to reset the accelerator pedal position sensor and you can also reset it with an OBD scanner.

How Much Does It Cost To Repair A P2135?

The cost of repairing the P2135 can range from $180 to $1200 on average. Some parts may need to be repaired or replaced to fix this code.

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