OBD-II code · Powertrain (generic)
P01A8 Alternative Fuel Rail/System Pressure - Too Low
Alt fuel rail or system pressure below the expected operating range.
Is it safe to drive with P01A8?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyAlt fuel pump weak
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1.5–6 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Alt Fuel Pump, Alt Fuel Lines, Regulator
Related codes
- P01A5Alternative Fuel Rail Pressure Sensor Circuit Low
- P01A6Alternative Fuel Rail Pressure Sensor Circuit High
- P01A7Alternative Fuel Rail Pressure Sensor Circuit Intermittent/Erratic
- P01A9Alternative Fuel Rail/System Pressure - Too High
- P01AAAlternative Fuel Tank Temperature Sensor Circuit
- P01ABAlternative Fuel Tank Temperature Sensor Range/Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.