P2A98 code meaning
Alternative Fuel Tank Select Valve B Control Circuit High
Powertrain system Generic code P2Axx codes Check engine light
What P2A98 means
P2A98 appears when the voltage on the control circuit of tank select valve B stays higher than the module allows for the commanded state. A ground-switched valve with an interrupted winding or lead shows this pattern, as does a wire that has picked up battery voltage. The valve will then not move on command, and the system keeps drawing from whichever vessel the resting valve connects. In Westport's two-vessel design with a single pump, that means one tank is used up and the second is never reached, so the engine runs short of gas while the gauge still shows reserve. CARB's heavy-duty rule expects such circuit faults to be detected and stored separately. No manufacturer publishes P2A98. A coil resistance check at the valve plug separates a dead coil from a wiring fault.
P2A98 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 P2A98
- Malfunction lamp on
- Second vessel never used, gas runs out early
- Gauge shows reserve while power drops
Common causes of P2A98
- Most likelyInterrupted winding or lead at valve B
- PossibleControl line of valve B in contact with battery voltage
- Less likelyCorrosion at the valve B connector raising resistance
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 bWiring harnessAfcm
What each part of P2A98 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. |
| 98 | The exact fault in that area. |
What to do next
- Note P2A98 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 P2A98
What does P2A98 mean?
P2A98 means "Alternative Fuel Tank Select Valve B Control Circuit High". P2A98 appears when the voltage on the control circuit of tank select valve B stays higher than the module allows for the commanded state. It is a generic code, so it means the same on every make.
Is it safe to drive with P2A98?
Drive gently and only to a workshop. With P2A98 the car can go into limp mode (reduced power) to protect itself.
Will P2A98 fail an emissions test?
Yes, it can. P2A98 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 P2A98 to fix?
Difficulty: hard. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P2A98 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.