P0C4A code meaning
Hybrid/EV Battery Pack Coolant Pump A Control Performance
Powertrain system Generic code P0Cxx codes Check engine light
What P0C4A means
P0C4A says pump A runs electrically but does not achieve its cooling effect. The 2011 Chevrolet Volt fails the test when the pump has been on for over 60 s and the pack inlet coolant temperature has moved by less than 5 °C, rated Type B. GM's bulletin PI0798A (Volt 2011–2015, Ampera 2012, ELR 2014–2016) traces the code after draining and refilling to trapped air, cured by a vacuum purge. Porsche explains for the 2018 Panamera 4 E-Hybrid that the pump reports dry running when its speed rises while current drops, a condition that can need a long stretch of driving before it is logged. Audi (Q4 e-tron 2022) and Bentley (Bentayga and Flying Spur Hybrid, EV speed capped near 48 km/h) also bleed first, Ford reflashes the battery module. FCA's Pacifica Hybrid uses P0C4A for inverter overtemperature instead.
P0C4A at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P0C4A
- MIL shortly after cooling system work
- Electric drive warning, reduced power or capped EV speed
- Gurgling noise from the coolant loop
Common causes of P0C4A
- Most likelyAir trapped in the battery coolant loop, often after a coolant service
- PossibleLow coolant level or a leak in the low-temperature loop
- PossibleWorn or failing coolant pump
- Less likelyBattery control module software (Ford/Lincoln 2020 hybrids)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery pack coolant pump aWiring harnessBms
What each part of P0C4A means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| C | Area: hybrid propulsion. |
| 4A | The exact fault in that area. |
What to do next
- Note P0C4A and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0C4A
What does P0C4A mean?
P0C4A means "Hybrid/EV Battery Pack Coolant Pump A Control Performance". P0C4A says pump A runs electrically but does not achieve its cooling effect. It is a generic code, so it means the same on every make.
Is it safe to drive with P0C4A?
Drive gently and only to a workshop. With P0C4A the car can go into limp mode (reduced power) to protect itself.
Will P0C4A fail an emissions test?
Yes, it can. P0C4A is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0C4A to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P0C4A clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.