P0D1CHybrid/EV Battery Pack Coolant Control Valve B Stuck On
- 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
- P0D1C means coolant control valve B of the battery circuit remains in its active position although the controller has commanded a change. What active means depends on the design: on valve A, Mercedes hybrid battery management distinguishes a shutoff valve that will not close (P0CE000) from one that will not open (P0CE100), which shows that makers map on and off to opposite valve states. For valve B no manufacturer publishes P0D1C in a bulletin or OBD table. Where feasible, CARB wants the parts that heat or cool the battery checked for proper function. A jammed valve, a driver that never switches off, or software misjudging the temperature response are plausible causes. Coolant then keeps flowing through the wrong path, so the pack may be overcooled or heated poorly. The opposite fault is P0D1B.
- What you may notice
- MIL or battery thermal system warning
- Battery warms slowly in cold weather or charging is slower than usual
- Likely causes
- PossibleValve B jammed in its active position
- RareOutput stage or supply that keeps the valve energised
- RareModule software misjudging the temperature response of the loop
- 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: €0 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.