P0B5EHybrid/EV Battery Voltage Sense H 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
- P0B5E flags a broken measuring path on voltage sense H, the eighth cell tap channel read by the battery monitoring electronics. In GM's 2019 tables the battery energy control module runs an open sense line test within a 0.6 s window: neighbouring cells diverging by 1.3 V or more, a cell under 36 mV while its balancing switch is on, or a splice above 0.1 V (0.5 V at a bus bar splice) sets it as Type A. Ford names P0B5E in two bulletins: a no-start on the 2019-2020 Fusion plug-in hybrid, repaired with a new traction battery, and the 2023 Mustang Mach-E and E-Transit, where H is the last code of the affected range and an intermittent flexible printed circuit at the BECM is blamed. Starting and charging may fail.
- What you may notice
- Powertrain malfunction (wrench) indicator and Stop Safely Now message
- Vehicle does not start or does not become ready to drive
- High-voltage battery cannot be charged
- Likely causes
- LikelyIntermittent flexible printed circuit cable at the battery controller (Ford Mach-E, E-Transit 2023)
- PossibleOpen cell tap, splice or bus bar connection on channel H
- PossibleInternal traction battery failure requiring pack replacement (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.