Powertrain
generic / SAE
P2538
Ignition Switch Accessory Position Circuit High
The ACC input reads stuck high — short to battery voltage. The ECM cannot detect when the operator releases the switch from ACC, accessory power timeouts do not work.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / 38
Possible causes
- ACC wire shorted to battery voltage high
- Connector pins corroded - high contact resistance low
- Supply wire pinched against B+ source low
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 80–500 €
- Estimated time: 0.5–2 h
- Component: ignition switch
- Component: wiring harness
- MIL / check engine light
Sources
References
sae:J2012