P0B59Hybrid/EV Battery Voltage Sense G 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
- Voltage sense G is the seventh cell measuring channel; how many cells or groups it covers depends on how the manufacturer splits the pack among monitoring chips. P0B59 is its open-circuit code. Two Ford bulletins name it: the 2019-2020 Fusion PHEV, where the open-line group up to P0B7C leads to a battery replacement, and the 2023 Mach-E and E-Transit, where it is blamed on the BECM flexible printed circuit. GM's BECM sets it after 0.6 s of an open-line pattern such as adjacent cells 1.3 V apart, a balanced cell under 36 mV or splice voltages above 0.1 V or 0.5 V, Type A. If several channels report at once, suspect a shared connection first.
- What you may notice
- Vehicle not ready to drive
- Charging blocked
- Wrench light or hybrid warning
- Likely causes
- LikelyOpen channel G tap, splice or bus bar contact
- PossibleIntermittent BECM flexible circuit (Ford Mach-E, E-Transit)
- 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.