Coolant pump A electrical connector damaged, corroded, or disconnected; Coolant pump A motor seized or internally shorted, causing a stall condition; Blown fuse or damaged wiring in the pump power or ground circuit; Low or contaminated battery coolant level causing pump cavitation and stall; Failed pump control module or driver circuit inside the hybrid control unit; Air lock in the battery coolant loop preventing proper pump priming; Debris or foreign material lodged in the pump impeller

DTC codes / P0Cxx · Hybrid propulsion / P0CFF

P0CFFHybrid/EV Battery Pack Coolant Pump A Stuck/Stalled

Q: What does code P0CFF mean?

Hybrid/EV Battery Pack Coolant Pump A Stuck/Stalled. P0CFF means the hybrid or electric vehicle battery pack coolant pump A has been commanded to run but the control module sees no expected response, indicating the pump is stuck or stalled. The computer typically detects this by comparing the pump's commanded speed or current draw against feedback from the pump or a lack of expected temperature change in the battery coolant loop.

P0CFF means the hybrid or electric vehicle battery pack coolant pump A has been commanded to run but the control module sees no expected response, indicating the pump is stuck or stalled. The computer typically detects this by comparing the pump's commanded speed or current draw against feedback from the pump or a lack of expected temperature change in the battery coolant loop.

SystemPowertrain

Code typeGeneric (all makes)

SeverityHigh

Fix difficultyProfessional

AreaHybrid propulsion

Symptoms you may notice

Illuminated check engine light or hybrid system warning light, often with no other noticeable symptoms
Reduced electric-only range or forced engine operation due to battery temperature management
A warning message on the dash indicating battery cooling or hybrid system fault
Possible reduced charging rate or charging disabled in some vehicles
Overheating of the high-voltage battery pack in severe cases, leading to power reduction
Audible pump noise or lack of pump noise when the vehicle is in ready mode

Common causes, most likely first

Coolant pump A electrical connector damaged, corroded, or disconnected
Coolant pump A motor seized or internally shorted, causing a stall condition
Blown fuse or damaged wiring in the pump power or ground circuit
Low or contaminated battery coolant level causing pump cavitation and stall
Failed pump control module or driver circuit inside the hybrid control unit
Air lock in the battery coolant loop preventing proper pump priming
Debris or foreign material lodged in the pump impeller

How to diagnose and fix it

Check battery coolant level and condition; top off or flush if contaminated
Inspect the coolant pump A electrical connector and harness for damage or corrosion
Test the pump power and ground circuits with a multimeter and verify fuse integrity
Command the pump on with a scan tool and listen for operation; compare commanded versus actual pump speed if data is available
Perform a voltage drop test on the pump feed and ground circuits under load
If electrical checks pass, remove the pump and inspect the impeller for binding or debris
Replace the coolant pump A if it fails electrical or mechanical testing, then bleed the cooling system and clear codes

What a stuck coolant pump really means

A pump can be electrically healthy but mechanically stuck due to debris or corrosion, so resistance checks alone may not reveal the fault.
Low coolant level is a common cause that mimics a failed pump; always verify the reservoir is at the correct level before condemning the pump.
Some vehicles set this code when the pump runs but the battery coolant temperature does not drop as expected, pointing to a flow restriction rather than a dead pump.
Air trapped in the battery coolant loop after a repair can cause the pump to stall and set P0CFF even when all components are good.
The code can be stored intermittently if the pump only stalls under certain temperature or load conditions, so a road test with live data is often necessary.

Can I keep driving with P0CFF?

Do not continue driving with this code if the hybrid or EV battery temperature warning is active, as overheating can damage the high-voltage battery. If only the check engine light is on and the vehicle drives normally, limit driving to a short distance to a repair facility and avoid heavy acceleration or fast charging.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.