What does code P01A9 mean?

Q: What does code P01A9 mean?

Alternative Fuel Rail/System Pressure - Too High. P01A9 indicates that the powertrain control module has detected an alternative fuel rail or system pressure that is higher than the calibrated target for the current operating conditions. The computer compares the pressure sensor signal against expected values and sets this code when the measured pressure exceeds the commanded pressure by a calibrated threshold for a set time.

DTC codes / P01xx · Fuel and air metering / P01A9

P01A9Alternative Fuel Rail/System Pressure - Too High

P01A9 indicates that the powertrain control module has detected an alternative fuel rail or system pressure that is higher than the calibrated target for the current operating conditions. The computer compares the pressure sensor signal against expected values and sets this code when the measured pressure exceeds the commanded pressure by a calibrated threshold for a set time.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaFuel and air metering

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