Code Definition

C1864 — Battery Module Fault

System: Chassis  |  Type: Manufacturer-Specific  |  Make: Generic

About C1864

C1864 is a manufacturer-specific chassis diagnostic trouble code. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

Scanning & clearing: Chassis (C) codes are stored in the ABS, traction control, or stability-control modules. An enhanced or OEM-level scan tool is usually required to read and clear them.

C1864 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

This code relates to the high voltage battery pack of an electric or hybrid vehicle, which is made up of multiple battery modules, each containing several cells monitored by the battery management system. The battery management system measures the voltage, temperature, and balance of each module and compares them against limits and against the other modules. DTC C1864 sets when the management system detects a fault in a battery module, such as an out of range or unbalanced cell voltage, an over temperature condition, an internal resistance problem, or a loss of the module sensing signal. When ...

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