P0C4BHybrid/EV Battery Pack Coolant Pump A Supply Voltage Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- MIL on
- Battery coolant pump not running, power limited when warm
- Likely causes
- LikelyBattery control module software (Ford Escape HEV, Explorer and Aviator 2020)
- PossibleBlown fuse or failed relay in the pump supply
- RareOpen feed wire or pushed-out pin at the pump connector
- 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: €20 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.