P24FBExhaust Aftertreatment Fuel Air Purge Valve Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- With P24FB the purge valve control line sits higher than allowed, a pattern that points to a short to battery voltage or to a broken low-side path, so the controller cannot pull the line down. In the Volvo/Mack AHI guide P24FB00 is listed right beside P24FA00 among the electrical codes, and the first check is the harness and the plug at the dosing module. If the valve never energises, compressed air does not flush the feed to the 7th injector, and fuel left there can carbonise over time. A driver stage that shuts itself off against overcurrent may also log this code. The low counterpart is P24FA, a plain interruption P24F8. Expect a warning lamp and, on trucks, a dash message about filter regeneration.
- What you may notice
- Warning lamp and aftertreatment message
- Filter regeneration unavailable
- Likely causes
- LikelyControl wire shorted to a battery-voltage feed in the harness
- PossibleInterrupted return path between valve and controller
- RareController output stage protecting itself against overcurrent
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.