P2CAFCharge Air Cooler Coolant Pump B Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2CAF says the control line of charge air cooler pump B is tied to supply voltage, so the engine computer cannot pull it down when it switches the pump on. As with the rest of the pump B series, no manufacturer documents the code publicly. For pump A, GM's LT5 table 19OBDG03A (P023C) carries out this check while the driver is on: below 0.5 Ω between output and controller power counts as a short to power, 50 of 63 samples, Type A with MIL in the first trip. Because the driver may shut itself down to avoid overheating, pump B then usually stops and the second half of the cooling loop loses flow. Typical causes are a wire pinched against a 12 V feed, moisture bridging two pins, or a shorted pump. A short to ground is P2CAE, an open line P2CAD.
- What you may notice
- MIL on after the first faulty trip
- Pump B does not start when commanded
- Reduced power at high load
- Likely causes
- LikelyControl wire of pump B pinched against a 12 V feed
- PossibleMoisture bridging supply and control pins at the pump
- PossibleShorted electronics inside pump B
- 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: €30 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.