P0CEBHybrid/EV Electronics Coolant Pump A Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- The control line of the electronics coolant pump sits at too low a level, typically because it is shorted to ground or the driver cannot pull it up. No manufacturer publishes setting criteria for this code. GM's 2019 HPC2 table names P0CEB only as a blocking code alongside P0CE9, P0CEC and P0CED: while any of them is active, the plausibility test of the electronics coolant temperature sensor (P0CEF) does not run. GM folds a grounded line into P0CE9 in other years, so how P0CEB is used depends on the controller. CARB requires inverter cooling components to be checked for circuit faults. The counterpart for a line stuck high is P0CEC. A shorted line can keep the pump from running, which lets the inverter and charger loop overheat and leads to power limits.
- What you may notice
- Malfunction indicator lamp or hybrid warning
- Electronics coolant pump does not run
- Power or charging limited as electronics temperatures rise
- Likely causes
- LikelyControl wire chafed through and touching body ground
- PossiblePump control input shorted internally
- PossibleWater or corrosion in the pump connector bridging pins to ground
- RareFaulty output stage in the controlling 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: €50 – €650
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.