Engine-Codes - Buick - P1682 BUICK

P1682 BUICK Code - Ignition 1 Switch Circuit 2

- Code Popularity: 18,857 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
Table of contents

|What are the Possible Causes of the P1682 BUICK Code?

  • Faulty ignition switch
  • Ignition Switch harness is open or shorted
  • Ignition Switch circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

|How to Fix the P1682 BUICK Code?

Start by checking 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's pins.

|P1682 BUICK code tech notes

There is a Factory Service Bulletin for the 2013-2014 Buick Enclave:

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.

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

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.

|What is the cost to diagnose the P1682 BUICK code?

Labor: 1.0

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

|What are P1682 BUICK code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Possible no crank or start

|What Does the P1682 BUICK 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.

Ignition 1 Switch Circuit 2

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