P24FA code meaning
Exhaust Aftertreatment Fuel Air Purge Valve Control Circuit Low
Powertrain system Generic code P24xx codes Check engine light
What P24FA means
P24FA reports that voltage on the purge valve control line is lower than the driver stage expects in the current switching state: a short to ground on the wire, a coil with too little resistance or a weak supply. Volvo and Mack name P24FA00 in the electrical section of their AHI troubleshooting guide for US10+OBD13 and newer engines; the work there is on the dosing module plug and the harness, not on the air or fuel side. Depending on how the driver is wired, a ground short can either keep the valve energised permanently or stop it from switching. In both cases the purge cycle after hydrocarbon dosing becomes unreliable, and the controller may suspend active regeneration until the fault is fixed. An open circuit is P24F8, the opposite polarity P24FB.
P24FA 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 P24FA
- Warning lamp shortly after key-on or during dosing
- Regeneration not possible
Common causes of P24FA
- Most likelyControl wire chafed through to chassis ground
- PossiblePurge valve coil with shorted turns
- Less likelyMoisture in the AHI module connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Aftertreatment purge valveSolenoid driver
What each part of P24FA 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). |
| FA | The exact fault in that area. |
What to do next
- Note P24FA 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 P24FA
What does P24FA mean?
P24FA means "Exhaust Aftertreatment Fuel Air Purge Valve Control Circuit Low". P24FA reports that voltage on the purge valve control line is lower than the driver stage expects in the current switching state: a short to ground on the wire, a coil with too little resistance or a weak supply. It is a generic code, so it means the same on every make.
Is it safe to drive with P24FA?
Drive gently and only to a workshop. With P24FA the car can go into limp mode (reduced power) to protect itself.
Will P24FA fail an emissions test?
Yes, it can. P24FA 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 P24FA to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P24FA clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.