P24A9 code meaning
EGR Cooler Coolant Pump Control Circuit Low
Powertrain system Generic code P24xx codes Check engine light
What P24A9 means
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.
P24A9 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P24A9
- Malfunction indicator lamp on
- Pump may run continuously or not at all
Common causes of P24A9
- Most likelyControl wire chafed through and shorted to ground
- PossibleInsulation melted near exhaust or EGR parts
- PossibleInternal short in the pump electronics
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
EGR cooler coolant pump
What each part of P24A9 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| A9 | The exact fault in that area. |
What to do next
- Note P24A9 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P24A9
What does P24A9 mean?
P24A9 means "EGR Cooler Coolant Pump Control Circuit Low". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P24A9?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P24A9 fail an emissions test?
Yes, it can. P24A9 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P24A9 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P24A9 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.