OBD-II code · Powertrain (generic, extended)
P2685 Actuator Supply Voltage C Circuit Low
The third actuator supply rail is below the expected voltage. Battery weakness, blown fuse, or excessive current draw collapses the supply.
Is it safe to drive with P2685?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyLoad on the rail shorted to ground
- PossibleBattery condition causes voltage to drop
- Less likelyConnector pins corroded - high contact resistance
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–2.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Actuator Supply C, Charging System
Related codes
- P0658Actuator Supply Voltage A Circuit Low
- P2670Actuator Supply Voltage B Circuit Low
- P26E8Actuator Supply Voltage D Circuit Low
- P2682Engine Coolant Bypass Valve A Control Circuit Low
- P2683Engine Coolant Bypass Valve A Control Circuit High
- P2684Actuator Supply Voltage C Circuit / Open
- P2686Actuator Supply Voltage C Circuit High
- P2687Fuel Supply Heater Control Circuit / Open
- P2688Fuel Supply Heater Control Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.