Powertrain, generic (extended)

P2A2F Alternative Fuel Tank Shutoff Valve E Control Circuit Performance/Stuck Off

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2A2F signals that valve E was energized but the system did not see the expected gas flow from that cylinder. No manufacturer publishes this code or its test conditions; CARB only requires output components to be checked for a proper reaction to commands. New Flyer's bulletin explains that its tank solenoids switch on while the starter spins the engine to about 400 rpm. A weak battery or a voltage dip during cranking can therefore leave a coil unable to lift its armature, which looks exactly like a valve that hangs shut. GM's bi-fuel Impala regulates gas to 468 to 896 kPa, a useful reference when checking the low-pressure side. Contamination and a closed manual valve remain obvious mechanical causes.

Likely causes

Voltage drop during cranking, coil cannot lift the armature
Contaminated or sticking valve E
Manual valve on cylinder E closed

Symptoms

  • Check engine light
  • Cylinder E does not empty
  • Fault appears mainly after cold or weak-battery starts

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–1,500
Time0.5–4 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

P2A2EP2A30P2A31P2A2BP224D

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