Wiring fault in the pump enable circuit, such as chafing, an open circuit, a short to earth or to supply; Corroded, loose or damaged connector at the pump or control unit; Faulty electronics coolant pump with internal driver or motor failure; Blown fuse or faulty relay supplying the pump circuit; Low voltage from a weak 12 V battery or poor earth connection affecting the pump circuit; Fault inside the controlling module's output driver; Outdated control unit software where the manufacturer has published a fix for this fault.

P0CED

Hybrid/EV Electronics Coolant Pump A Enable Circuit.

Generic
Powertrain
Generic code
High severity

How this code is built

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

What it means

P0CED is a generic code meaning the control unit has detected a fault in the enable circuit for hybrid or EV electronics coolant pump A. The module that commands the pump, usually the hybrid or battery control unit, saw a command-versus-feedback mismatch or an open, short or out-of-range signal on the enable line. The exact pump location and which module controls it depend on the model.

Symptoms

Hybrid or EV system warning light on the dashboard
Malfunction indicator lamp or power-limited message
Reduced power or the car going into a limp mode
Inverter or power electronics overheating warnings
Coolant pump not audible when the system is active
Reduced or disabled charging or hybrid assist

Possible causes

Wiring fault in the pump enable circuit, such as chafing, an open circuit, a short to earth or to supplylikely
Corroded, loose or damaged connector at the pump or control unitlikely
Faulty electronics coolant pump with internal driver or motor failurelikely
Blown fuse or faulty relay supplying the pump circuitpossible
Low voltage from a weak 12 V battery or poor earth connection affecting the pump circuitpossible
Fault inside the controlling module's output driverrare
Outdated control unit software where the manufacturer has published a fix for this faultrare

How to diagnose

Read all stored and pending codes and record the freeze frame data, noting any related coolant pump, inverter or 12 V supply codes.
Check the 12 V battery condition and charging voltage, as low voltage can set circuit faults.
Check the relevant fuse and relay for the electronics coolant pump using the model's wiring diagram.
Visually inspect the pump wiring and connectors for chafing, corrosion, water ingress or heat damage.
With the system active, listen and feel for pump operation, and check coolant level and flow in the electronics cooling loop following the manufacturer's safe procedure.
Using the wiring diagram, test the enable circuit for supply, earth, continuity and shorts, and check the pump's supply and earth under load.
Use a scan tool's actuator test, if available for the model, to command the pump and watch the feedback value.
Check for any manufacturer software updates or technical bulletins relating to this code on the specific model.

How to fix

Repair or replace damaged wiring and renew faulty connector terminals in the enable circuit.
Replace a blown fuse or faulty relay once the cause of the failure is found.
Replace the electronics coolant pump if it fails electrical or flow tests.
Restore the 12 V battery or earth connections if low voltage or poor earths are found.
Top up or bleed the electronics cooling circuit as per the manufacturer's procedure after any pump work.
Replace or reprogram the controlling module, or apply a published software update, only once the wiring and pump are proven good.

Can I keep driving?

High severity

Avoid driving until the fault is checked, as without cooling the power electronics can overheat and be damaged. If the car must be moved, keep it short and gentle and stop if any temperature warning appears.

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