U0600
Internal Control Module Memory Reset
A control module reports that its non-volatile memory has been reset (lost adaptions, lost coding, lost trip counters). Often appears after battery disconnects, voltage drops below operating limit, or module reflashes.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: easy
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Common causes
Ordered by how often each turns out to be the cause.
- Battery disconnected or low voltage eventCommon
- Module reflash or coding changePossible
- Gateway module routing CAN messages incorrectlyLess likely
Parts involved
- Control Module
U0600 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.