P2CB4Charge Air Cooler Coolant Pump B Supply Voltage Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2CB4 concerns the power feed of charge air cooler pump B rather than its command line: the pump finds its supply missing or outside the window in which it can run. No manufacturer documents P2CB4 publicly. Ford's 2024 gasoline OBD summary contains the same fault type, 1C (supply out of range), for auxiliary coolant pump B (P2B62); it is monitored all the time from 11 V battery voltage and logged after 5 s. Because the pump electronics sit inside the housing, as Bosch describes for its PCE pump, the pump measures its own supply pin and reports the result. A blown fuse, a relay with burnt contacts, a corroded ground, a damp plug or a weak battery are the usual causes; a voltage-drop test with the pump running finds hidden resistance. Without power the pump stops.
- What you may notice
- MIL on
- Pump B silent, charge air temperature climbs
- Other supply-related codes may be stored at the same time
- Likely causes
- LikelyBlown fuse or faulty relay in the pump B feed
- PossibleCorroded or loose ground connection of the pump
- PossibleMoisture or corrosion at the supply pins of the connector
- RareWeak battery or charging fault pulling the voltage down
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €10 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.