P0C4AHybrid/EV Battery Pack Coolant Pump A Control Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- MIL shortly after cooling system work
- Electric drive warning, reduced power or capped EV speed
- Gurgling noise from the coolant loop
- Likely causes
- 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
- RareBattery control module software (Ford/Lincoln 2020 hybrids)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.