P2631 OBD-II Trouble Code: O2 Sensor Pumping Current Trim Circuit High Bank 2 Sensor 1

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Cost of diagnosing the P2631 code

P2631 is a diagnostic trouble code (DTC) for "O2 Sensor Pumping Current Trim Circuit High Bank 2 Sensor 1". 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 P2621 code means?

P2621 is an OBD-II generic code for the engine control module (ECM) detecting an open or short circuit in the Air Fuel Radio (A/F) or O2 sensor, causing a high voltage at the signal wire to the ECM.

What causes the P2621 code?

  • The ECM monitors the A/F or O2 sensor signal wire voltage and will set the code of higher voltage than expected is seen.

  • The O2 sensor signal return wire shorted to the 5 volt reference wire.

What are the symptoms of the P2621 code?

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

  • The engine may not be able to go into closed fuel loop and will go into failure mode fuel control.

  • The engine may run good but may have very minor drivability symptoms like hesitation or lowered fuel mileage.

How does a mechanic diagnose the P2621 code?

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

  • Checks the O2 sensor and wiring harness for cuts into the harness causing the short.

  • Tests the wiring and sensor for shorted or corroded connectors and wiring.

  • Scans the O2 sensors and checks the voltage return on the signal wire for short to reference voltage.

Common mistakes when diagnosing the P2621 code?

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

  • Replacing the A/F or O2 sensor without checking the wiring connector for short to reference voltage

How serious is the P2621 code?

Code P2621 is a code indicating the A/F O2 sensor return signal is shorted to power and cannot generate the correct signal to the ECM for fuel control. The engine will not run in closed loop as long as the problem is happening.

What repairs can fix the P2621 code?

Additional comments for consideration regarding the P2621 code

Code P2621 is caused most commonly from an internal short to reference voltage in the A/F or O2 sensor. The sensor can be called an A/F sensor or an O2 sensor depending on manufacturer.

Need help with a P2621 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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