AutoCodes – GMC – P1682 2017 GMC Sierra

P1682 2017 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 2017 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 418

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 2017 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 2017 GMC Sierra - Ignition 1 Switch Circuit 2 - AutoCodes.com — P1682 2017 GMC Sierra Code - Ignition 1 Switch Circuit 2

What does this mean?

What are the Possible Causes of the DTC P1682 2017 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 2017 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 2017 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 2017 GMC Sierra code?

Need more information on how to fix the P1682 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1682 2017 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 2017 GMC Sierra Code

1. What does the OBDII code P1682 in a 2017 GMC Sierra mean?

The code P1682 indicates a problem with the Ignition 1 Switch Circuit 2 in the vehicle.

2. What are the common symptoms associated with OBDII code P1682 in a 2017 GMC Sierra?

Common symptoms include issues with starting the vehicle, engine stalling, and potential electrical malfunctions.

3. What are the possible causes of OBDII code P1682 in a 2017 GMC Sierra?

Potential causes include a faulty ignition switch, damaged wiring or connectors in the circuit, or a defective ignition switch relay.

4. How serious is the OBDII code P1682 in a 2017 GMC Sierra?

While the code itself may not cause immediate harm to the vehicle, it can lead to starting and electrical issues that may affect the overall performance and safety of the vehicle.

5. How can I diagnose the OBDII code P1682 in a 2017 GMC Sierra?

Diagnosing this code typically involves checking the ignition switch, inspecting the wiring and connectors in the circuit, and testing the ignition switch relay for proper functionality.

6. Can I still drive my 2017 GMC Sierra with the OBDII code P1682 present?

It is not recommended to drive the vehicle with this code present, as it can lead to unexpected stalling or electrical failures while on the road.

7. What are some repair tips for fixing OBDII code P1682 in a 2017 GMC Sierra?

Repair tips include replacing the faulty ignition switch, repairing any damaged wiring or connectors, and ensuring proper functioning of the ignition switch relay.

8. Can I reset the OBDII code P1682 in a 2017 GMC Sierra myself?

While you can clear the code with an OBDII scanner, it is important to address the underlying issue causing the code to prevent it from reoccurring.

9. How much does it cost to repair OBDII code P1682 in a 2017 GMC Sierra?

The cost of repairing this code can vary depending on the exact cause of the issue, but it may involve replacing the ignition switch or repairing the wiring, which can range from moderate to expensive.

10. Is it necessary to take my 2017 GMC Sierra to a mechanic for OBDII code P1682 repair?

While some DIY enthusiasts may attempt to address this code themselves, it is recommended to seek professional help, especially if you are not familiar with automotive electrical systems.