P24F8 code meaning
Exhaust Aftertreatment Fuel Air Purge Valve Control Circuit
Powertrain system Generic code P24xx codes Check engine light
What P24F8 means
P24F8 is the electrical fault of the fuel/air purge valve: the control unit finds the solenoid drive circuit not working, typically an open wire or a coil that draws no current. Volvo and Mack report it as P24F813, the suffix 13 meaning open circuit. In their AHI diagnosis guide for US10+OBD13 engines onward it stands in the electrical fault table together with P24FA and P24FB, and the prescribed work is the AHI module connector and the harness, not the air or fuel supply. The dosing module carries the valve; on newer trucks it sits on the fuel filter housing. While the valve cannot be driven, the doser line is not blown clear after dosing, which puts filter regeneration at risk. CARB's heavy-duty rules require actuators like this to be checked for circuit continuity.
P24F8 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P24F8
- Warning lamp right after the circuit test runs
- Active regeneration blocked or incomplete
Common causes of P24F8
- Most likelyBroken wire or chafed harness between engine controller and AHI module
- PossibleCorroded or loose plug at the AHI dosing module
- PossibleInterrupted coil of the purge valve solenoid
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Aftertreatment purge valveSolenoid driverWiring harness
What each part of P24F8 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). |
| F8 | The exact fault in that area. |
What to do next
- Note P24F8 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 P24F8
What does P24F8 mean?
P24F8 means "Exhaust Aftertreatment Fuel Air Purge Valve Control Circuit". P24F8 is the electrical fault of the fuel/air purge valve: the control unit finds the solenoid drive circuit not working, typically an open wire or a coil that draws no current. It is a generic code, so it means the same on every make.
Is it safe to drive with P24F8?
Drive gently and only to a workshop. With P24F8 the car can go into limp mode (reduced power) to protect itself.
Will P24F8 fail an emissions test?
Yes, it can. P24F8 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 P24F8 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P24F8 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.