P0CDFHybrid/EV Battery Pack Coolant Control Valve A Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0CDF signals an electrical fault in the drive circuit of coolant control valve A, the valve that routes or shuts off coolant to the hybrid or EV battery. Mercedes-Benz uses it in the battery management unit N82/2 of the S-, E- and C-Class hybrids, where it marks the actuation of the battery module coolant shutoff valve as electrically faulty or interrupted (service information LI83.30-P-061224, together with the stuck codes P0CE0 and P0CE1). An open coil, a broken wire, a corroded plug or a failed driver stage in the control unit are typical. CARB requires output drivers of the battery thermal management to be checked for circuit faults. If the valve cannot be operated, the battery may run too warm or too cold and charging or power can be limited. Shorts to ground or voltage appear as P0CE2 and P0CE3.
- What you may notice
- MIL or hybrid system warning
- Battery cooling or heating not working as intended
- Reduced charging or drive power
- Likely causes
- LikelyValve coil or actuator motor open
- PossibleBroken wire or corroded connector at the valve
- RareDriver stage in the battery or thermal control unit failed
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.