Low coolant level or air trapped in the power electronics cooling circuit; Failing electric coolant pump (worn motor, seized or weak flow); Wiring or connector fault in the pump power, ground or control signal circuit; Blocked or restricted coolant hose, radiator or inverter cooling passage; Faulty coolant temperature sensor giving implausible readings; Low 12 V supply voltage or poor battery condition affecting the pump; Fault in the pump control module or inverter control unit, or outdated software where the manufacturer has a known fix.

P0CEA

Hybrid/EV Electronics Coolant Pump A Performance.

Generic
Powertrain
Generic code
High severity

How this code is built

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

What it means

P0CEA is a generic powertrain code meaning the control unit has judged that Hybrid/EV Electronics Coolant Pump A is not performing as expected. The pump circulates coolant through the power electronics, such as the inverter or converter. The control unit compared the commanded pump operation with feedback or with temperatures and saw a mismatch. The exact strategy and which pump is 'A' depend on the model.

Symptoms

Warning lamp on, such as a hybrid system or powertrain fault light
Reduced power or limited electric assist (limp mode)
Power electronics overtemperature warning
Cooling fan running louder or more often than usual
Hybrid or EV system refusing to ready up or shutting down
Pump whine, or no pump noise at all, when the system is active

Possible causes

Low coolant level or air trapped in the power electronics cooling circuitlikely
Failing electric coolant pump (worn motor, seized or weak flow)likely
Wiring or connector fault in the pump power, ground or control signal circuitpossible
Blocked or restricted coolant hose, radiator or inverter cooling passagepossible
Faulty coolant temperature sensor giving implausible readingspossible
Low 12 V supply voltage or poor battery condition affecting the pumprare
Fault in the pump control module or inverter control unit, or outdated software where the manufacturer has a known fixrare

How to diagnose

Read all stored and pending codes and the freeze frame data, noting coolant temperatures, vehicle state and 12 V voltage when the fault set
Check the power electronics coolant level and condition against the manufacturer's procedure, looking for leaks
Inspect the pump wiring, connectors and fuses for damage, corrosion, loose pins or heat marks
Listen for the pump running and feel the hoses for flow when the system is active, following the manufacturer's high-voltage safety guidance
Use a scan tool to command the pump and compare commanded and actual speed or feedback, if the model supports it
Check coolant temperature sensor readings against actual temperature for plausibility
Test supply voltage, ground and control signal at the pump connector
Check for a manufacturer bulletin or software update relevant to the model and fault

How to fix

Top up or refill with the correct coolant and bleed air using the manufacturer's procedure, after fixing any leak
Replace the electric coolant pump if it is faulty or not delivering flow
Repair damaged wiring, connectors or terminals in the pump circuit
Clear blockages or replace restricted hoses or cooling components
Replace a faulty coolant temperature sensor
Update the control unit software only if an outdated version is a known cause for that model

Can I keep driving?

High severity

Limit driving and avoid it where possible. Inadequate cooling of the power electronics can cause overheating and damage to expensive hybrid or EV components, and the car may drop into limp mode. Have it inspected promptly, and stop if a temperature warning appears. High-voltage systems should only be worked on by trained technicians.

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