P0CEC code meaning
Hybrid/EV Electronics Coolant Pump A Control Circuit High
Powertrain system Generic code P0Cxx codes Check engine light
What P0CEC means
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.
P0CEC at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0CEC
- Malfunction indicator lamp on
- Pump runs permanently or does not respond to speed changes
- Possible power limitation of the hybrid system
Common causes of P0CEC
- Most likelyControl wire shorted to a 12 V feed in the harness
- PossibleMoisture or corrosion in the pump connector linking supply and control pins
- Less likelyPump electronics feeding voltage back onto the control line
- Less likelyOutput stage in the control module stuck high
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hybrid electronics coolant pump aWiring harnessHybrid control module
What each part of P0CEC means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| C | Area: hybrid propulsion. |
| EC | The exact fault in that area. |
What to do next
- Note P0CEC and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0CEC
What does P0CEC mean?
P0CEC means "Hybrid/EV Electronics Coolant Pump A Control Circuit High". P0CEC flags a pump control line that is held too high, normally a short to battery voltage on the output. It is a generic code, so it means the same on every make.
Is it safe to drive with P0CEC?
Drive gently and only to a workshop. With P0CEC the car can go into limp mode (reduced power) to protect itself.
Will P0CEC fail an emissions test?
Yes, it can. P0CEC is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0CEC to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P0CEC clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.