P1682 GMC Ignition 1 Switch Circuit 2
Possible causes
– Faulty ignition switch
– Ignition Switch harness is open or shorted
– Ignition Switch circuit poor electrical connection
– Faulty Engine Control Module (ECM)
– Ignition Switch harness is open or shorted
– Ignition Switch circuit poor electrical connection
– Faulty Engine Control Module (ECM)
What about the obd code?
The ECM has detected a voltage deifference between two circuits
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
– Possible no crank or start
– 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 GMC will set.
GMC Vehicle:GMC Acadia,GMC Canyon,GMC Envoy,GMC Savana 1500,GMC Savana 2500,GMC Savana 3500,GMC Sierra 1500,GMC Sierra 2500 HD,GMC Sierra 3500 HD,GMC Terrain,GMC Yukon,GMC Yukon XL 1500,GMC Yukon XL 2500,