AutoCodes – GMC – P1682 2016 GMC Sierra

P1682 2016 GMC Sierra Code - Ignition 1 Switch Circuit 2

Quick Answer

There are 2 ignition 1 voltage circuits supplied to the Engine Control Module (ECM). Common causes include Faulty ignition switch, Ignition Switch harness is open or shorted, Ignition Switch circuit poor electrical connection. 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 2016 GMC Sierra indicates Ignition 1 Switch Circuit 2.
Common causes: Common causes include Faulty ignition switch, Ignition Switch harness is open or shorted, Ignition Switch circuit poor electrical connection.
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.

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Code Popularity 408

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 11, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1682 2016 GMC Sierra 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 2016 GMC Sierra - Ignition 1 Switch Circuit 2 - AutoCodes.com — P1682 2016 GMC Sierra Code - Ignition 1 Switch Circuit 2

What does this mean?

What are the Possible Causes of the DTC P1682 2016 GMC Sierra?

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 DTC P1682 2016 GMC Sierra?

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

What does this mean?

Code Tech Notes

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1682 2016 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1682 2016 GMC Sierra code?

Need more information on how to fix the P1682 2016 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the 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 2016 GMC Sierra Code

1. What does OBDII code P1682 on a 2016 GMC Sierra mean?

The code P1682 for a 2016 GMC Sierra specifically relates to the Ignition 1 Switch Circuit 2.

2. What are the common symptoms of OBDII code P1682 on a 2016 GMC Sierra?

Common symptoms of P1682 may include issues with starting the vehicle, intermittent stalling, or problems with the vehicle's electrical systems.

3. What are the possible causes of OBDII code P1682 on a 2016 GMC Sierra?

Potential causes of P1682 can include a faulty ignition switch, wiring issues in the ignition circuit, or a malfunctioning ignition switch actuator.

4. How can I diagnose the OBDII code P1682 on my 2016 GMC Sierra?

Diagnosing P1682 may involve checking the ignition switch, inspecting the wiring for any damage, and testing the ignition switch actuator for proper function.

5. Can I still drive my 2016 GMC Sierra with OBDII code P1682?

It is not recommended to continue driving your vehicle with an unresolved P1682 code, as it may lead to further electrical issues or potential safety hazards.

6. How do I reset the OBDII code P1682 on my 2016 GMC Sierra?

Resetting the P1682 code typically involves using an OBDII scanner to clear the code after addressing the underlying issue with the ignition switch circuit.

7. Is it possible to repair OBDII code P1682 on a 2016 GMC Sierra myself?

Depending on your level of automotive expertise, you may be able to address the P1682 code yourself by inspecting the ignition components and wiring for any visible issues.

8. How much does it cost to repair OBDII code P1682 on a 2016 GMC Sierra at a mechanic?

The cost of repairing P1682 can vary depending on the specific issue, but it may involve replacing the ignition switch or addressing any wiring problems, which could range from $100 to $500 or more.

9. Will OBDII code P1682 on a 2016 GMC Sierra cause the check engine light to come on?

Yes, the P1682 code is likely to trigger the check engine light on your 2016 GMC Sierra, indicating a problem with the Ignition 1 Switch Circuit 2.

10. How urgent is it to address OBDII code P1682 on a 2016 GMC Sierra?

It is recommended to address the P1682 code promptly to prevent any further electrical issues or potential safety concerns while driving your 2016 GMC Sierra.