Code Definition

B2236 — Weak or Defected Electric Vehicle Battery Module Fault

System: Body  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About B2236

B2236 is a generic (obd-ii standard) body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

Because B2236 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

DTC B2236 is set by the high voltage Battery Management System (BMS) when it detects that one or more battery modules in the high voltage traction battery pack is weak or defective compared to the rest of the pack. The BMS continuously monitors each module's voltage, temperature, and internal impedance, and compares modules against each other to detect imbalance, excessive voltage sag under load, or self discharge that exceeds acceptable limits. A weak module typically presents as a cell or module group that drops voltage faster under load, recovers slower, runs warmer, or fails to balance wit...

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