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.
Medium severity. Can I keep driving?Avoid long trips and hard acceleration. If you smell fuel or the car stalls, do not continue.
Bank 2 is the side without cylinder 1, so it only exists on V or boxer engines.
Symptoms
- Check engine light on
- Reduced power
- Starting problems (with P00C6)
- Misfires with injector codes at the same time
Most likely causes
- Water or corrosion at the bank 2 intermediate connector (GM LT6: wrong 12-pin connector)
- Bank 2 rail pressure sensor faulty internally
- Genuine pressure fault on bank 2 (pump, control valve)
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It can trigger limp mode.
- It affects emissions.
What each character of P01BF means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- 1: Air and fuel
- BF: Specific fault in that system
Frequently asked questions
Can I keep driving with code P01BF?
Avoid long trips and hard acceleration. If you smell fuel or the car stalls, do not continue.
What causes code P01BF?
The most common causes are: water or corrosion at the bank 2 intermediate connector (GM LT6: wrong 12-pin connector); bank 2 rail pressure sensor faulty internally; genuine pressure fault on bank 2 (pump, control valve).
Related codes
- P0191Fuel Rail Pressure Sensor A Circuit Range/Performance
- P01BEFuel Rail Pressure Sensor Circuit Bank 2
- P01C0Fuel Rail Pressure Sensor Circuit Low Bank 2
- P01C1Fuel Rail Pressure Sensor Circuit High Bank 2
- P01C2Fuel Rail Pressure Sensor Circuit Intermittent/Erratic Bank 2
- P00C6Fuel Rail Pressure Too Low - Engine Cranking
Sources
- law.cornell.edu: 13 CCR 1968.2
- static.nhtsa.gov: MC 11009469 0001
- gsi.ext.gm.com: 18OBDG03A Engine Diagnostics
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.