Code Definition

B1004 — Keep alive memory KAM error

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

About B1004

B1004 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.

B1004 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 GM-specific body code is set when a control module — typically the Body Control Module (BCM) — detects an error in its Keep Alive Memory (KAM) during a power-up integrity check. KAM is a non-volatile memory area within the module that retains learned adaptive values, personalisation settings, security data, and operating calibrations when the ignition is off, relying on a continuous battery power supply to maintain data integrity. The code is triggered when the module determines that the stored KAM data is corrupt, incomplete, or unreadable — most commonly as a result of battery vol...

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