Powertrain, generic (extended)

P2A24 Alternative Fuel Tank Shutoff Valve B Control Circuit Low

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modeNo

P2A24 means the alternative fuel module sees the control line of shutoff valve B sitting too low. TransEco Energy, which converts trucks to CNG, assigns it in the fault table of its AFCM v1.4 to a lead shorted to ground or open, lights the MIL on dedicated and bi-fuel systems alike and does not force a fallback. The same table prints P2A14 in a second column beside it, a number that current code lists give to injection pump metering C. Ford's 2014 Boss 302S code list also includes P2A24, though without the MIL marker it shows for P224E. Chafed wires along the cylinder mounts are a classic cause. P2A25 is the high counterpart, P2A28 the matching fault on valve C.

Likely causes

Control wire of valve B chafed through to ground at a tank bracket

Open lead, which the TransEco module reports under this code

Shorted turns in the coil of valve B

Symptoms

Check engine light
Gas from tank B unavailable, range reduced

Repair estimate

DifficultyHardWorkshop job

Parts and labour€80–1,200

Time0.5–3 h

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

Parts involved

alt fuel tank shutoff valve bwiring harnessafcm

Related codes

P2A22 P2A23 P2A25 P2A28 P224E

References: http:, performanceparts.ford.com, law.cornell.edu.