Powertrain, generic (extended)

P2A95 Alternative Fuel Tank Select Valve B Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2A95 says the module finds no proper current path through tank select valve B. Where a second select valve exists, it typically serves the next vessel or supply in line. Cespira's patent for a gas engine fed from two compressed-gas supplies shows how much depends on such valves: the controller connects each supply either to a compressor or to the regulator, and only by switching can it keep using a supply whose pressure has dropped. With valve B dead, that step is missing and fuel held in the affected vessel is effectively stranded. Unlike P2A22, which concerns the shutoff solenoid on tank B, this code concerns the routing valve. No manufacturer documents P2A95. A broken lead, a loose plug or an open coil are the usual findings.

Likely causes

Loose plug or broken wire to select valve B
Open solenoid coil of valve B
Output stage for valve B in the module defective

Symptoms

  • Malfunction lamp on
  • Content of one vessel cannot be used
  • Range well below the usual figure

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,200
Time1–4 h

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

Parts involved

alt fuel tank select valve bwiring harnessafcm

Related codes

P2A96P2A97P2A98P2A91P2A99P2A22

References: law.cornell.edu, patents.google.com.