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P2620 OBD-II Trouble Code: Throttle Position Output Circuit Open

Check Engine Light

P2620 code definition

Throttle Position Output Circuit Open

What the P2620 code means

P2620 is an OBD-II code for the engine control module (ECM) detecting the throttle position closed output circuit is open and cannot detect a closed throttle. This is used by the throttle valve on some vehicles with diesel engines to know when to run the catalyst regeneration.

What causes the P2620 code?

The engine control module (ECM) monitors the throttle position to be open or closed using a closed throttle position sensor and has detected it has an open circuit.

The ECM cannot detect a closed throttle and will not actuate the throttle valve to run the catalyst regeneration.

What are the symptoms of the P2620 code?

  • The Check Engine Light will be illuminated and the code is set in the ECM memory as a fault.

  • The vehicle will not run any different in most cases except that it may not run the catalyst regeneration.

  • The engine ECM will not run the regeneration and may get a clogged catalyst.

How does a mechanic diagnose the P2620 code?

  • Scans for codes and documents the code in the ECM memory and looks at the freeze frame data for the problem before clearing the codes and retesting.

  • Checks for any manufacture repair bulletins for the code to see if a problem exists

  • Monitors the closed throttle position while monitoring the scanner

  • Checks the wires and connections to the throttle sensor

Common mistakes when diagnosing the P2620 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

  • Failing to verify the failure before replacing any parts

  • Failing to check manufacture bulletins before replacing parts

How serious is the P2620 code?

Code P2620 is an indication that the ECM cannot detect the vehicle is at closed throttle during a regeneration phase for the catalyst and may be running at too low of an idle since the throttle valve will not be actuated on an open throttle position. This may cause an engine stall at idle during regeneration.

What repairs can fix the P2620 code?

Additional comments for consideration regarding the P2620 code

Code P2620 is used on some diesel engines and the code may be used for different reasons by different manufacturers. It is recommended to follow any manufacture pinpoint tests for this code if your vehicle is not a diesel or if you have a different system than the one listed in this article.

Need help with a P2620 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 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
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