Powertrain, generic · Hybrid propulsion

P0B2E Hybrid/EV Battery C Voltage High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0B2E is set when the voltage of hybrid/EV battery C exceeds its upper limit. It pairs with P0B2D for undervoltage; P0B2C covers unstable readings and P0B2B the general fault. No manufacturer publishes a description of P0B2E. GM's comparable monitor for the complete pack is P0ABD, which fails above 479 V and is Type A, so the MIL comes on at once. CARB requires monitoring of hybrid battery voltage sensors and cells and dedicated codes for the replaceable unit. An overvoltage reading usually comes from a cell group that ended up overcharged because balancing failed, or from a drifting measurement channel. The controller then blocks or reduces charging and regenerative braking; plugging in may be refused.

Likely causes

Cell group in battery C charged too high, balancing ineffective
Drifting voltage measurement channel or sense lead fault
Battery controller software fault

Symptoms

  • Hybrid/EV system or high-voltage battery warning on
  • MIL on
  • Charging or recuperation restricted
  • External charging refused

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–4,000
Time1–10 h

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

Parts involved

hv battery cbms

Related codes

P0B2BP0B2CP0B2DP0B26P0B2AP0ABD

References: law.cornell.edu, gsi.ext.gm.com.