AutoCodes – GMC – P1682 2014 GMC Sierra

P1682 2014 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 2014 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 767

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 2014 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 2014 GMC Sierra - Ignition 1 Switch Circuit 2 - AutoCodes.com — P1682 2014 GMC Sierra Code - Ignition 1 Switch Circuit 2

What does this mean?

What are the Possible Causes of the DTC P1682 2014 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 2014 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 2014 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 2014 GMC Sierra code?

Need more information on how to fix the P1682 2014 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 2014 GMC Sierra Code

1. What does the OBDII code P1682 mean on a 2014 GMC Sierra?

P1682 indicates an issue with the Ignition 1 Switch Circuit 2, which involves a malfunction in the electrical circuit responsible for powering the ignition system.

2. What are the common symptoms of the P1682 code in a 2014 GMC Sierra?

Symptoms may include difficulty starting the engine, a no-start condition, the engine stalling while driving, or the Check Engine Light being illuminated.

3. What causes the P1682 code on a 2014 GMC Sierra?

Common causes include a faulty ignition switch, damaged wiring or connectors in the Ignition 1 circuit, a failing Powertrain Control Module (PCM), or a blown fuse.

4. Can I drive my 2014 GMC Sierra with the P1682 code?

It is not recommended to drive with this code active, as it can lead to engine stalling or prevent the vehicle from starting, potentially leaving you stranded.

5. How can I diagnose the P1682 code on a 2014 GMC Sierra?

Begin by inspecting the ignition switch, fuses, and wiring for damage or loose connections. Use a multimeter to test circuit continuity and verify proper voltage at the ignition circuit.

6. How do I fix the P1682 code on a 2014 GMC Sierra?

Repairs may include replacing the ignition switch, repairing or replacing damaged wiring, ensuring all connectors are secure, or reprogramming/replacing the PCM if necessary.

7. Is the P1682 code on a 2014 GMC Sierra a common problem?

While not extremely common, this code can occur due to wear and tear on the ignition switch or issues with the vehicle’s electrical system over time.

8. How much does it cost to fix the P1682 code on a 2014 GMC Sierra?

Repair costs depend on the underlying issue. Replacing an ignition switch typically costs $200–$400, while PCM replacement and programming can cost $500–$1,200.

9. Can a weak battery cause the P1682 code on a 2014 GMC Sierra?

Yes, a weak or failing battery can cause electrical issues that may trigger this code, so it’s important to ensure the battery and charging system are functioning properly.

10. Do I need to clear the P1682 code after repairs on a 2014 GMC Sierra?

Yes, after completing repairs, use an OBDII scanner to clear the code and verify that it does not return. This confirms the issue has been resolved.