P0641 OBD-II: Sensor Reference Voltage "A" Circuit/Open

P0641 Severity

Moderate

Will P0641 go away on its own?

Once the vehicle's onboard system no longer detects the issue, most codes will disappear on their own. If your vehicle still has this code, however, it should be properly diagnosed to avoid a more serious problem.

For a proper diagnosis, RepairPal Certified shops have the equipment, tools, and expertise.

Moderate severity codes might not threaten the vehicle's safety or functionality immediately, but you should still get it diagnosed within a reasonable time frame to keep your car running well.

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What causes OBD-II fault code P0641?

The engine control module (PCM) sends out a 5 volt reference signal to all applicable engine sensors. If the PCM detects an incorrect output signal, it will set code P0641.

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