Powertrain, generic · Hybrid propulsion

P0B26 Hybrid/EV Battery A Voltage High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0B26 means the voltage of hybrid/EV battery A is above the permitted value. Bentley documents it in the 48 V Dynamic Ride system of the Continental GT and Flying Spur, stored in address 0021 with symptom code 28672; the prescribed repair is replacing the super capacitor. On the Bentayga it appeared with P16C5, traced to a broken solder joint inside the capacitor; on the Bentayga and Flying Spur Hybrid it shows up in the high-voltage battery manager 008C beside P0B25, with MIL and red HV warning. GM monitors the analogous pack overvoltage with P0ABD (above 479 V, Type A). Typical reasons are a failing energy store, an overcharged cell group or a measuring fault. Low and unstable readings are P0B25 and P0B24. Charging and recuperation are limited.

Likely causes

Failing energy store, e.g. Bentley 48 V super capacitor
Cell group charged too high, balancing not effective
Voltage measurement fault in the controller or sense leads

Symptoms

  • Bentley Dynamic Ride fault warning, roll control inactive
  • MIL on
  • Hybrid/EV system or high-voltage battery warning on
  • Charging or recuperation restricted

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€300–5,000
Time1–10 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

hv battery abms

Related codes

P0B23P0B24P0B25P0B2AP0ABD

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.