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P1682 Buick Code - Ignition 1 Switch Circuit 2

- Code Popularity: 24,407 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC P1682 Buick?

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)
⚠ Does your Buick have Safety Recalls? → Check here

How to Fix the DTC P1682 Buick?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Code Tech Notes

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

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.

OBDII Code P1682 2013-2014 Buick Enclave - AutoCodes.com

OBDII Code P1682 2013-2014 Buick Enclave - AutoCodes.com

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1682 Buick code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to 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

Code 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 will set.

OBDII Code P1682 Buick - Ignition 1 Switch Circuit 2 - AutoCodes.com
P1682 Buick Code - Ignition 1 Switch Circuit 2

Need More Information on the Code?

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Code P1682 Buick comments

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