P24AA code meaning
EGR Cooler Coolant Pump Control Circuit High
Powertrain system Generic code P24xx codes Check engine light
What P24AA means
With P24AA the controller finds the control line of the EGR cooler coolant pump at a higher voltage than its switching state allows. The classic causes are a short circuit toward battery voltage, for example where the harness rubs against a powered wire, moisture in the connector, or a pump that no longer draws current so the line floats up. On some designs an open circuit can look like a high signal, so P24A7 and P24AA may appear together. Manufacturer limits are not public; the general CARB duty to watch actuator wiring plus supplier background on the cooler support this text. Measuring supply, ground and control voltage with the connector plugged in usually separates a wiring fault from a failed pump.
P24AA 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 P24AA
- Malfunction indicator lamp on
- Pump may not run when commanded
Common causes of P24AA
- Most likelyControl wire shorted to a battery voltage feed
- PossibleWater or corrosion in the pump connector
- PossiblePump electronics failed so no current is drawn
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 P24AA 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). |
| AA | The exact fault in that area. |
What to do next
- Note P24AA 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 P24AA
What does P24AA mean?
P24AA means "EGR Cooler Coolant Pump Control Circuit High". With P24AA the controller finds the control line of the EGR cooler coolant pump at a higher voltage than its switching state allows. It is a generic code, so it means the same on every make.
Is it safe to drive with P24AA?
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 P24AA fail an emissions test?
Yes, it can. P24AA 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 P24AA 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 P24AA clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.