P2A37
AFCM Power Relay Sense Circuit High
The sense feedback voltage from the AFCM power relay is above the expected window. Indicates relay output is energised when the relay should be off, or wire shorted to B+.
The sense feedback voltage from the AFCM power relay is above the expected window. Indicates relay output is energised when the relay should be off, or wire shorted to B+.
Common causes
- high
Relay contact stuck closed
One of the most commonly reported causes for this code — check this first.
Typical part cost: $130-660
- medium
Feedback wire shorted to B+
A plausible cause — test and verify before replacing parts.
Typical part cost: $130-660
See all causes + fix costs
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First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
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Related codes
See related trouble codes
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Frequently asked questions
What does P2A37 mean?
P2A37 means "AFCM Power Relay Sense Circuit High". It is a generic OBD-II code that points to a fault in the auxiliary emission controls.
What are the most common causes of P2A37?
relay contact stuck closed; feedback wire shorted to b+; connector pins corroded - high contact resistance — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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