P0CECHybrid/EV Electronics Coolant Pump A 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
- P0CEC flags a pump control line that is held too high, normally a short to battery voltage on the output. GM's HPC2 tables of 2016 and 2019 (16OBDG02, 19OBDG02) look for it while the pump enable is on and the commanded duty cycle is between 0 and 10 %: a line reading high when it should be nearly off counts as a failure, and 16 of 20 samples at 250 ms set the code, Type B, two trips, with system voltage above 10.2 V. A pump with a line pinned high may run constantly or ignore speed requests, depending on its electronics. Open circuits belong to P0CE9, a line pulled low to P0CEB, the separate enable wire to P0CED. The fix is usually in the harness: a pinched wire touching a feed or moisture in a connector.
- What you may notice
- Malfunction indicator lamp on
- Pump runs permanently or does not respond to speed changes
- Possible power limitation of the hybrid system
- Likely causes
- LikelyControl wire shorted to a 12 V feed in the harness
- PossibleMoisture or corrosion in the pump connector linking supply and control pins
- RarePump electronics feeding voltage back onto the control line
- RareOutput stage in the control module stuck high
- 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: €50 – €650
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.