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P1680 GMC - Control Module Not Programmed

Possible causes
- Engine Control Module (ECM) program error
- Wrong Engine Control Module (ECM)
- Faulty Engine Control Module (ECM)
What does this mean? What does this mean?
Tech notes
This code means that there may be an internal problem with the Engine Control Module (ECM). Start by checking battery charge and connections. Try clearing the code and re test.
What does this mean? What does this mean?
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1680 Gmc Description

The Engine Control Module (ECM) program does not recognize the vehicles id, or the id is missing in the ECM.

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