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

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Cost of diagnosing the P2136 code

P2136 is a diagnostic trouble code (DTC) for "Throttle/Pedal Position Sensor/Switch A/C Voltage Correlation". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

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What the P2126 code means?

P2126 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 P2126 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 P2126 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 P2126 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 P2126 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 P2126 code?

Code P2126 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 P2126 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 P2126 code

Code P2126 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.

Need help with a P2126 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6220.

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