Engine-Codes - GMC - P1682 GMC

P1682 GMC Code - Ignition 1 Switch Circuit 2

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- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC P1682 GMC?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty ignition switch
  • Ignition Switch harness is open or shorted
  • Ignition Switch circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

Code Tech Notes





User Submitted Video

There is a Factory Service Bulletin for the following GMC models:
2016-2018 GMC Sierra 1500
2019 GMC Sierra Limited
Dead Battery / P1682 P129D P10E4 P2535 / Crank No Start

There is a Factory Service Bulletin for the 2013-2014 GMC Acadia:

CONDITION:
Customers may comment of intermittent Service Engine Soon light on with Reduced Engine Power and/or engine stall with P0689 and/or P1682 stored in history.

CAUSE:
Terminal #51 at X3 Connector of Under Hood Fuse Block loose terminal tension with arcing corrosion on terminal #51 on fuse block.

CORRECTION
1. Check for water intrusion on IP fuseblock. If water leak and corrosion is found, repair following normal SI procedures. If no indication of water or corrosion, go to the next step.
2. Remove under hood fuse block and inspect for any arcing corrosion on terminal 51 of the X3 connector. It is helpful to use a cell phone camera to zoom in on the terminal to see the arc spot. If an arc spot is found, replace under hood fuse panel and terminal 51 in the harness using a terminated lead.


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How to Fix the DTC P1682 GMC?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P1682 GMC code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • No Engine Crank or Start

What Does the P1682 GMC Code Mean?

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.

P1682 GMC Code - Ignition 1 Switch Circuit 2

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