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P1682 2018 GMC Sierra Code - Ignition 1 Switch Circuit 2

Quick Answer

The P1682 diagnostic trouble code for a 2018 GMC Sierra indicates a problem with the Ignition 1 Switch Circuit 2. Common causes include Faulty ignition switch, Wiring or connection issues in the ignition circuit, Blown fuse related to the ignition system. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1682 2018 GMC Sierra indicates Ignition 1 Switch Circuit 2.
Common causes
Common causes include Faulty ignition switch, Wiring or connection issues in the ignition circuit, Blown fuse related to the ignition system.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Aug 18, 2024
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Code P1682 2018 GMC Sierra Description

The P1682 diagnostic trouble code for a 2018 GMC Sierra indicates a problem with the Ignition 1 Switch Circuit 2. This code typically means that there is a malfunction in the circuit that controls the ignition switch, which is responsible for providing power to various electrical components in the vehicle. The ignition switch plays a crucial role in starting the engine and powering essential systems like the fuel pump, ignition system, and other accessories. If this circuit is not functioning properly, it can lead to issues such as intermittent starting problems, electrical malfunctions, and potential safety hazards.

OBDII Code P1682 2018 GMC Sierra - Ignition 1 Switch Circuit 2
P1682 2018 GMC Sierra Code - Ignition 1 Switch Circuit 2

Common Causes of P1682 2018 GMC Sierra

  1. Faulty ignition switch
  2. Wiring or connection issues in the ignition circuit
  3. Blown fuse related to the ignition system
  4. Malfunctioning ignition control module
  5. Electronic control unit (ECU) failure

Symptoms of P1682 2018 GMC Sierra

  1. Intermittent starting problems
  2. Engine stalling or misfiring
  3. Loss of power to electrical components
  4. Illumination of the check engine light
  5. In some cases, the vehicle may not start at all

How to Fix P1682 2018 GMC Sierra

  1. Diagnose the issue by using a diagnostic scanner to retrieve the trouble codes and perform a thorough inspection of the ignition system.
  2. Check the wiring and connections related to the ignition switch for any signs of damage or corrosion. Repair or replace as needed.
  3. Test the ignition switch for proper functionality and replace if faulty.
  4. Inspect and replace any blown fuses in the ignition circuit.
  5. If necessary, replace the ignition control module or ECU if they are found to be the root cause of the issue.

Cost to Fix P1682 2018 GMC Sierra

The cost of repairing the Ignition 1 Switch Circuit 2 issue in a 2018 GMC Sierra can vary depending on the specific cause of the problem and the labor rates in your area. On average, the repair costs for this type of issue can range from $150 to $500, including parts and labor. However, it's important to note that prices may be higher at dealerships or in metropolitan areas, while independent shops may offer more affordable rates. It's recommended to get a personalized estimate from a trusted auto repair shop to determine the exact cost for your vehicle.

What does this mean?

Tech Notes for P1682 2018 GMC Sierra

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

Need more information about the P1682 2018 GMC Sierra code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1682 2018 GMC Sierra Code

1. What does OBDII code P1682 in a 2018 GMC Sierra mean?

The code P1682 in a 2018 GMC Sierra indicates a problem with the Ignition 1 Switch Circuit 2.

2. What are the common symptoms of OBDII code P1682 in a 2018 GMC Sierra?

Common symptoms of P1682 may include issues starting the vehicle, intermittent stalling, and problems with electrical components.

3. What are the possible causes of OBDII code P1682 in a 2018 GMC Sierra?

Possible causes of P1682 include a faulty ignition switch, wiring issues, poor electrical connections, or a malfunctioning ignition switch circuit.

4. How can I diagnose the source of OBDII code P1682 in my 2018 GMC Sierra?

To diagnose P1682, you may need to perform a thorough inspection of the ignition switch, check the wiring for any damage, and test the circuit for continuity using a multimeter.

5. Can I still drive my 2018 GMC Sierra with OBDII code P1682 present?

It is not recommended to drive your GMC Sierra with the P1682 code present, as it may lead to potential safety hazards and further damage to the vehicle.

6. How can I repair OBDII code P1682 in my 2018 GMC Sierra?

Repairing P1682 may involve replacing the faulty ignition switch, repairing damaged wiring, ensuring proper electrical connections, and clearing the trouble code with an OBDII scanner.

7. Will disconnecting the battery reset OBDII code P1682 in a 2018 GMC Sierra?

Disconnecting the battery may temporarily reset the code, but if the underlying issue causing P1682 is not fixed, the code is likely to reappear after some time.

8. Can a DIY enthusiast fix OBDII code P1682 in a 2018 GMC Sierra?

Depending on your level of automotive expertise, a DIY enthusiast may be able to diagnose and repair P1682 by following online guides or service manuals. However, if unsure, it's best to consult a professional mechanic.

9. How much does it cost to repair OBDII code P1682 in a 2018 GMC Sierra at a mechanic?

Repair costs for P1682 can vary based on the specific issue and labor rates in your area. It's advisable to get quotes from different mechanics to compare prices before proceeding with the repair.

10. Is OBDII code P1682 a serious issue in a 2018 GMC Sierra?

While P1682 may not always indicate a critical problem, it should be addressed promptly to prevent potential safety risks and avoid further damage to the vehicle's electrical system.

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