P2A22 code meaning
Alternative Fuel Tank Shutoff Valve B Control Circuit/Open
Powertrain system Generic code P2Axx codes Check engine light
What P2A22 means
P2A22 covers the drive circuit of shutoff valve B, the electric lock on a further gas cylinder of a multi-tank CNG or LPG installation, when the module finds no current path at all. A broken lead, a loose plug or a burnt-out coil are the usual findings. No manufacturer documents P2A22 publicly; the upfitter TransEco lumps an open line into its Low code P2A24 instead. New Flyer's CNG bus bulletin SMB-169 suggests a quick test for a dead tank solenoid: swap its coil with the one from a neighbouring valve. CARB's comprehensive component rules require such outputs to be checked for wiring faults. With one cylinder isolated, the remaining tanks still feed the engine, so reduced range is often the first thing a driver notices.
P2A22 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyHard
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2A22
- Check engine light
- Noticeably shorter range on gas
- Gas left in one cylinder after the others are empty
Common causes of P2A22
- Most likelyBroken lead or disconnected plug at the valve on tank B
- PossibleBurnt-out solenoid coil of valve B
- Less likelyCorroded terminals in the valve connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Alt fuel tank shutoff valve bWiring harnessAfcm
What each part of P2A22 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| A | Area: hybrid propulsion. |
| 22 | The exact fault in that area. |
What to do next
- Note P2A22 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2A22
What does P2A22 mean?
P2A22 means "Alternative Fuel Tank Shutoff Valve B Control Circuit/Open". P2A22 covers the drive circuit of shutoff valve B, the electric lock on a further gas cylinder of a multi-tank CNG or LPG installation, when the module finds no current path at all. It is a generic code, so it means the same on every make.
Is it safe to drive with P2A22?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2A22 fail an emissions test?
Yes, it can. P2A22 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2A22 to fix?
Difficulty: hard. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P2A22 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.