Powertrain, generic (extended)

P2A26 Alternative Fuel Tank Shutoff Valve C Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2A26 is the open-circuit code for shutoff valve C, the solenoid on yet another gas cylinder. The module drives the coil and finds that no current flows, so the coil, its plug or the lead to it is interrupted. No manufacturer documents P2A26 publicly. What the repair costs depends on the design: in GM's single-tank bi-fuel Impala (bulletin PI1330) the high-pressure solenoid is threaded into the tank's manual valve and counts as non-serviceable, so a faulty one means a new tank, whereas New Flyer buses allow the coil alone to be exchanged. CARB requires output components to be watched for open and shorted circuits. Valves B, D and E have their own open-circuit codes, P2A22, P2A2A and P2A2E.

Likely causes

Interrupted lead or unplugged connector at valve C
Open coil in valve C
Faulty driver for valve C in the control module

Symptoms

  • Check engine light
  • Gas in cylinder C cannot be used

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–2,500
Time0.5–4 h

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

Parts involved

alt fuel tank shutoff valve cwiring harnessafcm

Related codes

P2A27P2A28P2A29P2A22P2A2AP2A2E

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