P2A92 is the functional check for tank select valve A: the wiring tests pass, yet the fuel system does not behave as if the commanded vessel were connected. Software can judge this only through pressures. A patent by Cespira, the Westport and Volvo venture, outlines the logic for two compressed-gas supplies with their own pressure sensors: a supply-select valve assembly routes one supply to a compressor and the other to the regulator, and stages change whenever a supply falls under a set pressure. After such a command the newly chosen supply should start to lose pressure while the other holds steady. If nothing changes, or the wrong tank empties, valve A is probably sticking or leaking across its seat. No manufacturer publishes P2A92 or a threshold for it.
High severity. Can I keep driving?If you smell gas, do not keep driving or start the engine: move away and call for assistance. With no smell, drive moderately to an authorized shop.
Symptoms
- Malfunction lamp on
- Tanks empty unevenly or in the wrong order
- Short gas supply although one vessel still holds fuel
Most likely causes
- Select valve A sticking from dirt, ice or wear
- Valve A leaking across its seat so both vessels are drawn
- Tank pressure sensor giving a misleading reading
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- It can trigger limp mode.
- It affects emissions.
What each character of P2A92 means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- A: Hybrid or air and fuel
- 92: Specific fault in that system
Frequently asked questions
Can I keep driving with code P2A92?
If you smell gas, do not keep driving or start the engine: move away and call for assistance. With no smell, drive moderately to an authorized shop.
What causes code P2A92?
The most common causes are: select valve A sticking from dirt, ice or wear; valve A leaking across its seat so both vessels are drawn; tank pressure sensor giving a misleading reading.
Related codes
- P2A91Alternative Fuel Tank Select Valve A Control Circuit/Open
- P2A93Alternative Fuel Tank Select Valve A Control Circuit Low
- P2A94Alternative Fuel Tank Select Valve A Control Circuit High
- P2A96Alternative Fuel Tank Select Valve B Control Circuit Performance
- P2A9AAlternative Fuel Tank Select Valve C Control Circuit Performance
- P019EAlternative Fuel Tank A Pressure Sensor Circuit
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.