P0C4C code meaning
Hybrid/EV Battery Pack Coolant Pump A Supply Voltage Circuit Low
Powertrain system Generic code P0Cxx codes Check engine light
What P0C4C means
P0C4C reports that the supply voltage reaching battery coolant pump A is below the expected level while the circuit is not fully open. Typical reasons are high resistance in the feed, a corroded fuse contact, a weak relay, a poor ground or a short to ground that drags the line down. No manufacturer documents P0C4C publicly. Ford uses the sibling P0C4B for the open supply circuit on its 2020 Escape, Explorer and Aviator hybrids, and Bentley's bulletin on P0C4700 for 2025–2026 Continental GT and Flying Spur hybrids shows what such a feed contains: a 10 A fuse, a relay and a harness route that can chafe at the rear suspension. CARB requires the electrical parts of battery thermal management to be monitored. A pump that receives too little voltage runs slowly or not at all.
P0C4C at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.3 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0C4C
- MIL or hybrid or EV warning
- Coolant pump running slowly or intermittently
- Battery power reduced when the pack warms up
Common causes of P0C4C
- Most likelyHigh resistance from corroded fuse, relay contacts or connector
- PossiblePoor pump ground connection
- Less likelySupply wire chafed and shorted to ground
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 P0C4C 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. |
| 4C | The exact fault in that area. |
What to do next
- Note P0C4C 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 P0C4C
What does P0C4C mean?
P0C4C means "Hybrid/EV Battery Pack Coolant Pump A Supply Voltage Circuit Low". P0C4C reports that the supply voltage reaching battery coolant pump A is below the expected level while the circuit is not fully open. It is a generic code, so it means the same on every make.
Is it safe to drive with P0C4C?
Drive gently and only to a workshop. With P0C4C the car can go into limp mode (reduced power) to protect itself.
Will P0C4C fail an emissions test?
Yes, it can. P0C4C 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 P0C4C to fix?
Difficulty: medium. A typical repair takes 0.3 to 2.5 hours of work. This is a job for a workshop.
Will P0C4C clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.