What does code P2A99 mean?

Q: What does code P2A99 mean?

Alternative Fuel Tank Select Valve C Control Circuit/Open. P2A99 indicates that the powertrain control module (PCM) has detected an open circuit or control fault on the electrical path for the alternative fuel tank select valve C. This valve is responsible for switching between fuel sources, such as gasoline and compressed natural gas (CNG) or liquefied petroleum gas (LPG), and the PCM monitors the control circuit for expected voltage or current changes when the valve is commanded. When the circuit remains open or the feedback does not match the command, the PCM stores this code and may disable alternative fuel operation.

DTC codes / P2Axx · Hybrid propulsion / P2A99

P2A99Alternative Fuel Tank Select Valve C Control Circuit/Open

P2A99 indicates that the powertrain control module (PCM) has detected an open circuit or control fault on the electrical path for the alternative fuel tank select valve C. This valve is responsible for switching between fuel sources, such as gasoline and compressed natural gas (CNG) or liquefied petroleum gas (LPG), and the PCM monitors the control circuit for expected voltage or current changes when the valve is commanded. When the circuit remains open or the feedback does not match the command, the PCM stores this code and may disable alternative fuel operation.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaHybrid propulsion

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.