Powertrain, generic · Hybrid propulsion

P0B2F Hybrid/EV Battery D Voltage

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P0B2F is the general voltage fault of hybrid/EV battery D, the fourth and last sub-battery in this code family. The controller reports with it that the voltage of unit D is implausible, without specifying unstable (P0B30), low (P0B31) or high (P0B32). Only packs that the manufacturer splits into four separately monitored units can set it, and no manufacturer documents P0B2F publicly. For orientation, GM checks the whole pack with P0ABB to P0ABD, including a comparison of the pack voltage with the sum of all cells. CARB requires voltage sensors and cells of hybrid storage systems to be monitored, with codes pointing to the smallest replaceable unit. The driver sees a hybrid or battery warning and reduced power.

Likely causes

Weak or failing cells or module in battery D

Fault in the voltage sense leads or connectors of battery D

Battery controller software or internal measurement fault

Symptoms

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

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

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