OBD-II code · Powertrain (generic, extended)
P2686 Actuator Supply Voltage C Circuit High
The third actuator supply rail is above the expected voltage. Likely a charging system overvoltage or a short to a higher-voltage source.
Is it safe to drive with P2686?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- PossibleAlternator regulator failure
- Less likelyWiring shorted to a higher-voltage circuit
- Less likelyConnector pins corroded - high contact resistance
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–3.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Actuator Supply C, Charging System
Related codes
- P0659Actuator Supply Voltage A Circuit High
- P2671Actuator Supply Voltage B Circuit High
- P26E9Actuator Supply Voltage D Circuit High
- P2683Engine Coolant Bypass Valve A Control Circuit High
- P2684Actuator Supply Voltage C Circuit / Open
- P2685Actuator Supply Voltage C Circuit Low
- P2687Fuel Supply Heater Control Circuit / Open
- P2688Fuel Supply Heater Control Circuit Low
- P2689Fuel Supply Heater Control Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.