Code Definition

B1013 — ROM checksum error

System: Body  |  Type: Manufacturer-Specific  |  Make: GM

About B1013

B1013 is a manufacturer-specific body diagnostic trouble code recorded for GM vehicles. 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.

B1013 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

The Body Control Module (BCM) performs a continuous internal self-test routine that compares the current checksum value of its Read-Only Memory (ROM) against a stored reference value written during manufacture. DTC B1013 is set when the BCM detects that the calculated ROM checksum does not match the stored reference, indicating that the module's internal program memory has become corrupted or the memory hardware is failing. The ROM contains the core operating software that tells the BCM how to control body electrical systems such as interior lighting, power door locks, exterior lighting, and s...

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