P0CEB: Hybrid/EV Electronics Coolant Pump A Control Circuit Low

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.

High severity. Can I keep driving?If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

Symptoms

Malfunction indicator lamp or hybrid warning
Electronics coolant pump does not run
Power or charging limited as electronics temperatures rise

Most likely causes

Control wire chafed through and touching body ground
Pump control input shorted internally
Water or corrosion in the pump connector bridging pins to ground
Faulty output stage in the controlling module

What to check, in order

Start with the simplest. You can tick off each step.

Read the codes with a hybrid-compatible scanner and write down the freeze frame data
With the connector unplugged, check whether the signal wire is making contact with ground.
Make sure the battery cooling air intake is clean
Check the 12 V auxiliary battery, which can also trigger warnings
Leave any high-voltage measurements to a specialized repair shop

Good to know

Repair difficulty: medium
It can trigger limp mode.
It affects emissions.

What each character of P0CEB means

P: Powertrain: engine and transmission
0: Generic code: same on every make
C: Subsystem depends on the code range
EB: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0CEB?

If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

What causes code P0CEB?

The most common causes are: control wire chafed through and touching body ground; pump control input shorted internally; water or corrosion in the pump connector bridging pins to ground.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.