P1681 Buick Control Module Not Programmed

P1682 Buick 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)
What about the obd code?
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 Buick 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 Buick will set.

Buick Vehicle:Buick Regal – ?Buick Riviera – ?Buick LaCrosse – ?David Dunbar Buick – Buick Century – Buick LaCrosse – Buick LeSabre – Buick Lucerne – Buick Park Avenue – Buick Regal – Buick Verano – Buick Enclave – Buick Encore – Buick Rainier – Buick Rendezvous – Buick Terraza – Buick Riviera