P0DE9Hybrid/EV Battery Pack Coolant Control Valve C Performance/Stuck Off
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0DE9 says coolant control valve C is electrically fine but does not do its job: it fails to reach the commanded position or remains in its off state. No manufacturer documents P0DE9 publicly. GM's 2011 Chevrolet Volt tables show what such a test can look like for valve A, which has a position feedback: on start-up the valve must find its end stop within 800 ms, later it must reach each target within 1.5 s, and an erratic feedback with more than 12 % noise counts as well; enough failed samples set a Type B code with the MIL on the second trip. Where no feedback exists, makers judge the valve from coolant or pack temperatures, which CARB requests as a functional check of cooling. Dirt, a seized valve body or a weak actuator are typical. Stuck on is P0DEA.
- What you may notice
- Battery heats up faster under load or while fast charging
- Charging power or drive power limited
- Malfunction indicator lamp on
- Likely causes
- LikelyValve body seized or sluggish from deposits
- PossibleWorn actuator motor or gearing in valve C
- PossibleLow coolant or air in the battery loop distorting the temperature check
- RareOverly tight diagnostic calibration
- 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: €100 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.