P0B54Hybrid/EV Battery Voltage Sense F Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Ford's 2024 special service message for the 2023 Mustang Mach-E and E-Transit is the most instructive case for P0B54: vehicles built up to 9 December 2023 could store this and the other open-line codes from P0B3B to P0B5E, show the wrench light, refuse to start or charge, or display Stop Safely Now, and the cause was an intermittent BECM flexible printed circuit cable rather than the cells. The 2019-2020 Fusion PHEV shows the same code with a battery replacement as remedy. P0B54 itself means sense channel F is electrically open; GM confirms this with neighbouring cells at least 1.3 V apart, a balanced cell under 36 mV or a splice above 0.1 V for 0.6 s, Type A.
- What you may notice
- Powertrain malfunction (wrench) indicator on
- No start or no charging
- Stop Safely Now message
- Likely causes
- LikelyIntermittent BECM flexible printed circuit cable (Ford Mach-E, E-Transit built to Dec 2023)
- PossibleOpen channel F tap or splice
- RareInternal traction battery failure (Ford Fusion PHEV)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €8,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.