P1682 GMC - Ignition 1 Switch Circuit 2
- Faulty ignition switch
- Ignition Switch harness is open or shorted
- Ignition Switch circuit poor electrical connection
- Faulty Engine Control Module (ECM)
When is the code detected?
The ECM has detected a voltage deifference between two circuits
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible no crank or start
P1682 GMC Description
There are 2 ignition 1 voltage circuits supplied to the Engine Control Module (ECM). The first ignition circuit is provided by the powertrain relay, through a fuse. This ignition 1 voltage circuit supplies power to all the internal ECM circuits associated with the throttle actuator control (TAC) operation. The second ignition 1 voltage circuit is supplied by the run/crank relay through a fuse, and is used to power the remaining internal ECM circuits. If the ECM detects a voltage difference between the 2 ignition 1 voltage circuits, DTC P1682 will set.
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GMC Technical Service Bulletins for P1682 code
2007 GMC SIERRA 3500 Fuel System, Gasoline:storage:tank Assembly Details
2007 GMC SIERRA 3500 Fuel System, Gasoline:storage:tank Assembly:mounting Details
2007 GMC SIERRA 3500 Fuel System, Other:storage:tank Assembly Details
2007 GMC SIERRA 3500 Fuel System, Other:storage:tank Assembly:filling/charging Details
2007 GMC SIERRA 3500 Fuel System, Other:storage:tank Assembly:mounting Details
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