OBD-II code · Powertrain (generic, extended)
P2679 Coolant Degassing Valve Control Circuit Low
Voltage on the coolant degassing valve control line is below the expected window. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P2679?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyControl wire shorted to ground
- PossibleInternal short in solenoid coil
- Less likelyConnector pins corroded - high contact resistance
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.8–2.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Coolant Degassing Valve, Solenoid, Wiring Harness
Related codes
- P2676Air Cleaner Inlet Control Circuit Low
- P2677Air Cleaner Inlet Control Circuit High
- P2678Coolant Degassing Valve Control Circuit / Open
- P267AB Rocker Arm Actuator Position Sensor Circuit Bank 2
- P267BB Rocker Arm Actuator Position Sensor Circuit Range/Performance Bank 2
- P267CB Rocker Arm Actuator Position Sensor Circuit Low Bank 2
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.