P0C4B code meaning
Hybrid/EV Battery Pack Coolant Pump A Supply Voltage Circuit/Open
Powertrain system Generic code P0Cxx codes Check engine light
What P0C4B means
P0C4B refers to the power feed of battery coolant pump A rather than its command line: the controller sees no or only an implausible supply voltage at the pump, typically because a fuse, relay, connector or wire in the feed is open. Ford documents the code on its 2020 hybrids. On the Escape HEV built up to 10 June 2020, bulletin 20-2221 lists P0C4B with other battery codes in the battery energy control module and cures the MIL by reprogramming PCM and BECM; bulletins 20-2293 and 20-2345 name it for the Explorer and Aviator hybrids. Without a software cause, the fuse and relay in the pump feed come first. CARB requires the electrical components of battery thermal management to be monitored. P0C4C and P0C4D are the low and high variants of the same supply.
P0C4B 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 P0C4B
- MIL on
- Battery coolant pump not running, power limited when warm
Common causes of P0C4B
- Most likelyBattery control module software (Ford Escape HEV, Explorer and Aviator 2020)
- PossibleBlown fuse or failed relay in the pump supply
- Less likelyOpen feed wire or pushed-out pin at the pump connector
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 P0C4B 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. |
| 4B | The exact fault in that area. |
What to do next
- Note P0C4B 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 P0C4B
What does P0C4B mean?
P0C4B means "Hybrid/EV Battery Pack Coolant Pump A Supply Voltage Circuit/Open". P0C4B refers to the power feed of battery coolant pump A rather than its command line: the controller sees no or only an implausible supply voltage at the pump, typically because a fuse, relay, connector or wire in the feed is open. It is a generic code, so it means the same on every make.
Is it safe to drive with P0C4B?
Drive gently and only to a workshop. With P0C4B the car can go into limp mode (reduced power) to protect itself.
Will P0C4B fail an emissions test?
Yes, it can. P0C4B 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 P0C4B to fix?
Difficulty: medium. A typical repair takes 0.3 to 2.5 hours of work. This is a job for a workshop.
Will P0C4B clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.