Powertrain, generic (extended)

P24F8 Exhaust Aftertreatment Fuel Air Purge Valve Control Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Broken wire or chafed harness between engine controller and AHI module
Corroded or loose plug at the AHI dosing module
Interrupted coil of the purge valve solenoid

Symptoms

  • Warning lamp right after the circuit test runs
  • Active regeneration blocked or incomplete

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–1,200
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

aftertreatment purge valvesolenoid driverwiring harness

Related codes

P24F9P24FAP24FBP24F6P2697

References: static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.