Powertrain, generic · Hybrid propulsion

P0B32 Hybrid/EV Battery D Voltage High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0B32 sets when the voltage of hybrid/EV battery D goes above its permitted maximum. It is the high counterpart of P0B31; P0B30 covers unstable readings and P0B2F the general fault. No manufacturer documents P0B32 publicly; Bentley's P0B26 for battery A, cured by replacing the 48 V super capacitor, shows the same fault type on another unit. GM's analogous whole-pack monitor is P0ABD (above 479 V, Type A, MIL at once). CARB requires hybrid storage voltage sensors and cells to be monitored and codes to identify the replaceable unit. Causes are an overcharged cell group when balancing fails, a defective module or a measuring error. Charging and recuperation are cut back, and the contactors may open to protect the pack.

Likely causes

Cell group in battery D charged too high, balancing ineffective
Defective module in battery D
Voltage measurement fault in the controller or sense leads

Symptoms

  • Hybrid/EV system or high-voltage battery warning on
  • MIL on
  • Charging or recuperation restricted
  • Battery power limited, less electric drive or assist

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 dbms

Related codes

P0B2FP0B30P0B31P0B26P0B2EP0ABD

References: law.cornell.edu, gsi.ext.gm.com, static.nhtsa.gov.