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?
Replacing the throttle actuator valve
Repairing the wiring to the sensor or connector
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?
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