P2679Coolant Degassing Valve Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2679 indicates that the control line of the switched valve in the coolant vent path to the expansion tank reads too low. Usually the wire is grounded somewhere, or the solenoid has shorted turns; with a low-side driver the valve may then stay energised regardless of the command. The engine controller compares the line voltage with the state it set. Dodge lists P2679 among the fault codes that the reprogrammed engine controller of the 2004–2006 Sprinter can newly store under emissions recall T21, but the recall text gives no description of the circuit. Otherwise no maker explains P2679 publicly. CARB requires such circuit checks for controlled cooling components. A valve held in one state can slow warm-up or hinder venting.
- What you may notice
- Check engine light or stored code
- Slow warm-up
- Coolant level fluctuations in the expansion tank
- Likely causes
- LikelyControl wire shorted to ground
- PossibleShorted turns in the degassing valve solenoid
- RareCoolant or water leaking into the valve connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €40 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.