Ignition Switch Accessory Position Circuit Low
The ACC input reads stuck low — short to ground or permanently closed contact. The ECM may see ACC active continuously and refuse to enter sleep, draining the battery.
Affected components
- Ignition switch
- Wiring harness
Common causes
- High likelihood: ACC wire shorted to ground
- Low likelihood: Connector pins corroded - high contact resistance
- Low likelihood: Harness chafing through insulation
Diagnostic notes
- The malfunction indicator lamp may illuminate
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.