Powertrain, generic (extended)

P2A31 Alternative Fuel Tank Shutoff Valve E Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2A31 closes the shutoff valve series with the high fault on valve E: the module measures voltage on the control wire where none should be. TransEco names a short to power and lights the MIL while the gas system continues; it prints P2A21 beside the code. Ford's Boss 302S list includes P2A31 without a MIL marker. In operation this can mean that cylinder E keeps supplying gas when the module wants it locked, for example after the inertia switch has tripped, the device through which Ford cut gas on its 2003 bi-fuel CNG vehicles. In the J2012 range the AFCM power relay codes follow from P2A32 onwards. P2A30 is the low-side code for the same valve, P2A2D the high fault on valve D.

Likely causes

Valve E wire shorted to a voltage source
Driver for valve E in the module stuck on
Valve E fed from a wrong circuit after an upfit

Symptoms

  • Check engine light
  • Cylinder E not locked when it should be

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 ewiring harnessafcm

Related codes

P2A2EP2A2FP2A30P2A2DP2A32

References: http:, performanceparts.ford.com, static.nhtsa.gov, law.cornell.edu.