P0DECHybrid/EV Battery Pack Coolant Control Valve C Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0DEC is the short-to-voltage case for coolant control valve C: its drive line reads high at a moment when the controller expects it low. No manufacturer documents P0DEC publicly. For valve A, GM's 2011 Volt checks driver line 1 for a high level while the valve should be stopped or moving forward, again needing 90 failures in 100 checks for a Type B code. Unlike a ground short, a line held at supply voltage can keep the valve energised, so the valve may creep to an end stop instead of freezing. Keep the drive circuit apart from the feedback: on valves with a position sensor, a signal above the valid range is a sensor code such as P0CE7, not P0DEC. A wire pinched against a live feed or a driver that will not switch off is typical. Short to ground is P0DEB, open circuit P0DE8.
- What you may notice
- Valve C runs to an end position and stays there
- Pack temperature drifts, power or charging limited
- Malfunction indicator lamp on
- Likely causes
- LikelyWire pinched against a supply line
- PossibleDriver stage in the module not switching off
- RareMoisture bridging pins in the connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.