P2CADCharge Air Cooler Coolant Pump B Control 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
- Where a charge air cooling loop has a second electric pump, it carries the letter B. P2CAD reports that the control line to that pump is open, so the driver stage in the engine computer sees no load. No manufacturer documents a pump B or this code publicly. GM publishes the matching test for pump A (P023A) on the supercharged LT5 in table 19OBDG03A: with the low-side driver switched off, more than 200 kΩ between output and ground counts as open; 50 failed samples out of 63 at 100 ms, main relay at least 11 V, Type A with MIL on the first trip. Unplugged or corroded connectors, a broken wire or an open motor winding are the common finds. A pump driven only over LIN has no such line and would report through U01BC instead.
- What you may notice
- MIL on, often after the first trip
- Pump B silent; charge air temperature rises under load
- Reduced engine power
- Likely causes
- LikelyPump B connector loose, unplugged or corroded
- PossibleBroken control wire between engine module and pump B
- PossibleOpen motor winding or internal board fault in 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.