P2537: Ignition Switch Accessory Position Circuit Low
What to do
The engine drives normally. Mention it if the battery goes flat when the car stands for a few days — a stuck accessory signal keeps parts of the vehicle awake, and that is a common thing to blame on the battery instead.
What this code means
The accessory position circuit reads below its valid range, normally a short to ground — which the module reads as a permanent accessory request. The mechanism is at P2536.
A permanently asserted accessory signal tends to keep parts of the vehicle awake that should sleep, so the practical consequence is a slow battery drain rather than anything the driver notices while using the car.
Likely causes
Start here
- Wiring shorted to ground · moderate
- Faulty ignition switch · moderate
- Worn ignition switch contacts · moderate
Less common
- Damaged wiring harness · moderate
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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