P2CA2Charge Air Cooler Coolant Pump Sense Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2CA2 is set when the return wire from the intercooler pump sits below its valid range for longer than allowed. Insulation worn through against the body, water in the plug, or pump electronics that keep pulling the line down are the usual suspects. The last case is tricky: pumps working on the principle in Pierburg's patent US8392060B2 report a fault by grounding the line for a coded duration, so a line that never comes back up looks the same as a pump stuck in its error state, and a real pump defect may stand behind the code. MACS stresses that electric water pumps work with a PWM input plus a feedback signal, so both should be scoped side by side. No manufacturer documents P2CA2 publicly; CARB requires the circuit check. P2CA1 is the high case.
- What you may notice
- MIL on
- Engine power limited when charge air temperature rises
- Code may appear together with pump speed or performance codes
- Likely causes
- LikelyFeedback wire chafed against body or engine ground
- PossiblePump electronics holding the line low because of an internal fault
- PossibleMoisture or corrosion bridging pins in 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: €40 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.