Code Definition

B1009 — Eeprom checksum error

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

About B1009

B1009 is a manufacturer-specific body diagnostic trouble code recorded for Holden 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.

B1009 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) in Holden vehicles stores critical configuration and adaptive data in Electrically Erasable Programmable Read-Only Memory (EEPROM), and maintains an inverse copy of certain memory blocks as a data integrity safeguard. DTC B1009 is set when the BCM's microprocessor performs a checksum validation by reading a stored value and its inverse copy and finds that they do not sum to zero, indicating that the stored data has become corrupted. This corruption can result from voltage instability during write cycles, interrupted programming events, electrical surges, or degrad...

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