P2CA3Charge Air Cooler Coolant Pump Sense Circuit Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- With P2CA3 the feedback signal from the intercooler pump is electrically inside its limits but does not fit what the controller expects: a reported speed or status that contradicts the command, a pulse pattern it cannot decode, or a reply that changes although the request stayed constant. Rheinmetall offers auxiliary pumps for exactly these loops that talk to the engine computer by PWM or LIN and carry extensive self-diagnosis, so the controller relies on this answer to know the loop is circulating. Contact resistance in the plug, interference on the wire, a failing pump circuit board or mismatched software in pump or engine module are possible causes. No manufacturer documents P2CA3 publicly; CARB asks for rationality checks of such inputs. Fixed high or low levels are P2CA1 and P2CA2.
- What you may notice
- MIL on, sometimes only intermittently
- Power reduction on long climbs or in hot weather
- Likely causes
- LikelyLoose or corroded terminal distorting the feedback signal
- PossiblePump circuit board sending erratic or implausible feedback
- RareInterference from ignition or alternator on a poorly routed wire
- RarePump or engine module software not matching each other
- 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: €40 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.