Powertrain, generic · Hybrid propulsion

P0B2C Hybrid/EV Battery C Voltage Unstable

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0B2C indicates that the voltage of hybrid/EV battery C is unstable, meaning it changes faster or further than plausible for the current load, while a steady deviation would set P0B2D or P0B2E. No manufacturer documents P0B2C publicly. The pattern is known from the A and B siblings: on the Jeep Wrangler 4xe and Grand Cherokee 4xe, P0B24 and P0B28 were cured with battery controller software, and Ford fixed P0B24 on the Mach-E the same way. CARB requires the voltage sensors of the hybrid storage to be monitored for circuit and rationality faults. Physically, a loose busbar screw, a corroded sense terminal or a cell with high internal resistance can make the voltage of unit C jump, so the warning often comes and goes.

Likely causes

Loose busbar, terminal or sense contact in battery C
Battery controller software (pattern known from P0B24/P0B28)
Cell with rising internal resistance in battery C

Symptoms

  • Hybrid/EV system or high-voltage battery warning on
  • MIL on
  • Warning comes and goes, fault often stored as intermittent
  • Battery power limited, less electric drive or assist

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–3,000
Time0.5–8 h

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

Parts involved

hv battery cbms

Related codes

P0B2BP0B2DP0B2EP0B24P0B28P0B30

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