Wiring fault in the pump control circuit, such as chafing causing a short to earth or an open circuit; Corroded, loose or damaged connector at the pump or control module; Failed electronics coolant pump with an internal short or faulty drive electronics; Blown fuse or relay, or a fault in the pump power supply; Low coolant level or air in the electronics cooling circuit affecting pump operation; Fault in the controlling module (inverter, power management or hybrid control unit).

P0CEB

Hybrid/EV Electronics Coolant Pump A Control Circuit Low.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
C: AreaHybrid propulsion
EB: FaultThe specific fault in that area

What it means

P0CEB is a generic code meaning the control circuit for hybrid or EV electronics coolant pump A is reading low. The control module drives or monitors the pump through a control circuit and saw a voltage or signal level lower than expected, which suggests a short to earth, an open circuit or a fault in the pump driver. The pump cools power electronics such as the inverter or converter, so which components it serves depends on the model.

Symptoms

Hybrid or EV system warning light or malfunction indicator lamp on
Reduced power or limp mode from the hybrid or electric drive system
Power electronics overheating warnings or derated charging
Coolant pump not running, or not audible when the system is active
Hybrid system refusing to start or shutting down in some cases

Possible causes

Wiring fault in the pump control circuit, such as chafing causing a short to earth or an open circuitlikely
Corroded, loose or damaged connector at the pump or control modulelikely
Failed electronics coolant pump with an internal short or faulty drive electronicslikely
Blown fuse or relay, or a fault in the pump power supplypossible
Low coolant level or air in the electronics cooling circuit affecting pump operationpossible
Fault in the controlling module (inverter, power management or hybrid control unit)rare

How to diagnose

Read all stored and pending codes and freeze frame data, noting any related coolant temperature or inverter temperature codes
Check the electronics coolant level in the correct reservoir, following the manufacturer's high voltage safety guidance
Inspect the pump wiring and connectors for chafing, corrosion, water ingress and pin damage
Check the relevant fuses and relays and the pump supply voltage and earth
Use a scan tool with bidirectional controls to activate the pump and listen or feel for it running
Measure the control circuit voltage or signal at the pump connector against the manufacturer's specification, as it varies by model
Check for coolant flow and temperature rise in the circuit to confirm the pump is actually moving coolant
Only if the circuit and pump test good, investigate the controlling module, following model-specific procedures

How to fix

Repair or replace damaged wiring in the pump control circuit
Clean, repair or replace faulty connectors and terminals
Replace the electronics coolant pump if it is faulty
Replace a blown fuse or faulty relay after finding the cause of the failure
Top up or refill and bleed the electronics cooling circuit using the correct coolant and procedure
Repair or replace the controlling module only after all other causes are ruled out

Can I keep driving?

Medium severity

Short, cautious driving may be possible, but without pump flow the power electronics can overheat and the system may derate or shut down. Avoid heavy loads and long journeys and have it fixed soon.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.