P24A9EGR Cooler Coolant Pump Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P24A9 reports that the voltage on the control line of the electric EGR cooler coolant pump is lower than the driver stage expects in its current switching state, which usually points to a harness or pump-internal short to ground, or to a chafed wire touching the engine block. Whether low means switched on permanently or not at all depends on how the manufacturer drives the pump (low-side or high-side switching, or a PWM signal). Published limits are not available from any maker, so CARB's rules for monitoring actuator circuits and supplier notes on EGR coolers stand in. Inspect the harness near hot exhaust parts for melted insulation. P24AA is the short-to-supply counterpart, P24A7 the open line.
- What you may notice
- Malfunction indicator lamp on
- Pump may run continuously or not at all
- Likely causes
- LikelyControl wire chafed through and shorted to ground
- PossibleInsulation melted near exhaust or EGR parts
- PossibleInternal short in the pump electronics
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.