P2A93 code meaning
Alternative Fuel Tank Select Valve A Control Circuit Low
Powertrain system Generic code P2Axx codes Check engine light
What P2A93 means
P2A93 is stored when the module measures a voltage on the control line of tank select valve A that falls short of the level expected for the commanded state. With a low-side driver this usually means the line touches ground, which can energise the solenoid permanently and keep valve A in its switched position regardless of the command. If the valve is fed from the positive side instead, the same fault overloads that output, which then usually switches itself off. In both cases the module can no longer choose the vessel, so the automatic change from an empty tank to a full one, as described in Westport's two-vessel patent, cannot be relied on. Valves near cryogenic lines collect condensation, so water in the connector is a plausible cause. No manufacturer documents P2A93; P2A94 is the high case.
P2A93 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2A93
- Malfunction lamp on
- Tank selection stuck, one vessel emptied completely
- Fuse or output protection of the gas module trips
Common causes of P2A93
- Most likelyControl wire of valve A chafed through to ground
- PossibleCondensation or water in the connector of valve A
- Less likelyShorted turns in the coil of valve A
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Alt fuel tank select valve aWiring harnessAfcm
What each part of P2A93 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. |
| 93 | The exact fault in that area. |
What to do next
- Note P2A93 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 P2A93
What does P2A93 mean?
P2A93 means "Alternative Fuel Tank Select Valve A Control Circuit Low". P2A93 is stored when the module measures a voltage on the control line of tank select valve A that falls short of the level expected for the commanded state. It is a generic code, so it means the same on every make.
Is it safe to drive with P2A93?
Drive gently and only to a workshop. With P2A93 the car can go into limp mode (reduced power) to protect itself.
Will P2A93 fail an emissions test?
Yes, it can. P2A93 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 P2A93 to fix?
Difficulty: hard. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P2A93 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.