P2136 OBD-II Trouble Code: Throttle/Pedal Position Sensor/Switch A/C Voltage Correlation

What the P2136 code means?

P2136 is an OBD-II generic code for the engine control module (ECM) detecting the throttle pedal position sensors A and C voltages do not correlate to each other for return voltage to the ECM.

What causes the P2136 code?

• The ECM monitors the throttle position sensor (TPS) and has detected the A and C throttle position sensors signal return to the ECM do not correlate with each other.

• One of the sensors has an internal fault. The TPS may house both sensors.

• The sensor circuit or connector has a loose or broken connection.

What are the symptoms of the P2136 code?

• The Check Engine light will be illuminated and the code is set in ECM memory as a fault. The light will stay on unless the problem goes away for more than three running cycles.

• The TPS has redundant sensors for the throttle position and may not have a drive complaint on some vehicles.

• On some vehicles, the vehicle may go into limp home mode and limit the throttle opening and throttle response.

How does a mechanic diagnose the P2136 code?

• Scans for and documents the codes in the ECM and looks at the freeze frame data for the failure.

• Checks the TPS wiring and connection for loose or corroded connections.

• Scans and views data from the TPS while operating throttle to see which sensor is failing or not correlating.

• Follows the manufacturer pinpoint tests for the diagnosis and replacement of the TPS.

• On some vehicles the two throttle position sensors A and C may be inside one single sensor and would be replaced as a single unit.

Common mistakes when diagnosing the P2136 code?

• Clearing ECM memory codes before checking the freeze frame data for the main failure problem, so the failure may be duplicated and repaired.

• Failing to clear the ECM codes after the codes are fixed.

• Replacing the TPS without verifying the sensor has a problem.

How serious is the P2136 code?

Code P2136 is a problem with the TPS and this can cause no throttle control problems and should be fixed immediately. The TPS is needed to control the throttle opening and closing.

What repairs can fix the P2136 code?

• Replace the TPS assembly if it is a single unit for the TPS or replace the failed throttle position sensor if they are two separate sensors.

• Repair the connector pins for corrosion or loose connections at the TPS or the ECM.

• Clear the codes and retest to verify the problem is not present.

Additional comments for consideration regarding the P2136 code

Code P2136 is for a code that two TPS sensor signals do not agree with each other on throttle movement and position. Most vehicles will have a single sensor assembly that houses multiple throttle position sensors in one housing. It is replaced as an assembly. The redundant sensors are for safety and will prevent accidental throttle movement when it was not intended.

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