OBD-II code · Powertrain (generic, extended)
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+.
Is it safe to drive with P2A37?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyRelay contact stuck closed
- PossibleFeedback wire shorted to B+
- Less likelyConnector pins corroded - high contact resistance
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Likely to fail
- Parts involved
- Afcm Power Relay, Afcm, Wiring Harness
Related codes
- P2A34AFCM Power Relay Control Circuit High
- P2A35AFCM Power Relay Sense Circuit
- P2A36AFCM Power Relay Sense Circuit Low
- P2A38O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 3
- P2A39O2 Sensor Positive Current Control Circuit Low Bank 1 Sensor 3
- P2A3AO2 Sensor Positive Current Control Circuit High Bank 1 Sensor 3
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.