P01BFFuel Rail Pressure Sensor Circuit Range/Performance Bank 2
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- The bank 2 rail pressure sensor measures the pressure in a second, separate high-pressure rail on V engines that have one rail with its own sensor per bank. Many V engines connect both rails and use only one sensor (P0190–P0194); the only documented user of the bank 2 codes is GM's 5.5 litre LT6 (Corvette Z06 2023–2024) with a digital sensor per rail. P01BF is the plausibility fault of the bank 2 sensor, the counterpart of P0191. GM documents it on the LT6 as an 'internal component fault' of the sensor, appearing together with codes for low rail pressure at start (P00C6), pressure regulation at its limit and injector faults: a wrong 12-pin intermediate connector to the bank 2 rail let water in. The fix was a new engine/injector harness and rail pressure sensor. Thresholds are not published; GM's dual-channel comparison on bank 1 (1.0 MPa) suggests similar logic. On a fault the module uses a substitute value and usually limits power.
- What you may notice
- Check engine light on
- Reduced power
- Starting problems (with P00C6)
- Misfires with injector codes at the same time
- Likely causes
- LikelyWater or corrosion at the bank 2 intermediate connector (GM LT6: wrong 12-pin connector)
- PossibleBank 2 rail pressure sensor faulty internally
- RareGenuine pressure fault on bank 2 (pump, control valve)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €80 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.