P0E20Hybrid/EV Battery Pack Coolant Control Valve A Control Circuit Driver Current/Temperature Too 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
- P0E20 points at the driver that powers coolant control valve A: its output has exceeded a current limit or run too hot and switched itself off. No manufacturer documents P0E20 publicly. Valve A is often a small motor actuator; on the 2011 Chevrolet Volt it is driven in both directions through two drive lines, each with its own ground and voltage short checks (90 failures in 100 samples at 6.25 ms, Type B). Driving a motor into a jammed end stop is exactly what heats such a stage, so a sticking valve is a prime suspect. Mercedes reports the electrical fault of its battery shutoff valve as P0CDF00 instead. TI's automotive smart switches illustrate the protection itself: shut-off at the current limit or near 150 °C, with a fault flag. P0E21 and P0E22 cover valves B and C.
- What you may notice
- Check engine light on
- Valve A stays in its last position
- Battery runs too warm or too cold, power or charging limited
- Likely causes
- LikelyValve A sticking or jammed so the actuator stalls
- PossiblePartial short in the valve actuator motor or its wiring
- RareDegraded valve driver in the control module
- 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.