AutoCodes – Chevrolet – P1682 2018 Chevrolet Silverado

P1682 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 1,485

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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado - Ignition 1 Switch Circuit 2 - AutoCodes.com — P1682 2018 Chevrolet Silverado Code - Ignition 1 Switch Circuit 2

What does this mean?

What are the Possible Causes of the DTC P1682 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado code?

Need more information on how to fix the P1682 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado Code

1. What does the OBDII code P1682 mean on a 2018 Chevrolet Silverado?

P1682 indicates an issue with "Ignition 1 Switch Circuit 2," meaning the Engine Control Module (ECM) has detected a problem with the secondary ignition voltage circuit.

2. What are the common symptoms of code P1682 on a 2018 Silverado?

Symptoms may include difficulty starting the engine, stalling, reduced engine performance, or the Check Engine Light being illuminated.

3. What causes the P1682 code to appear on a 2018 Chevrolet Silverado?

Common causes include a faulty ignition switch, wiring issues in the ignition circuit, a failing ECM, or corrosion on electrical connectors.

4. Can I drive my 2018 Silverado with a P1682 code?

Driving with a P1682 code is not recommended, as it could lead to stalling or other reliability issues, potentially leaving you stranded.

5. How do I diagnose the P1682 code on a 2018 Chevrolet Silverado?

Start by checking the ignition switch and related wiring for damage or loose connections. Use a multimeter to test voltage in the circuit and ensure proper operation of the ECM.

6. What repairs can fix the P1682 code on a 2018 Silverado?

Repairs may include replacing the ignition switch, repairing or replacing damaged wiring or connectors, or, in rare cases, replacing the ECM.

7. How much does it cost to fix code P1682 on a 2018 Chevrolet Silverado?

Repair costs vary depending on the issue. Replacing the ignition switch typically costs $200â€“$400, while ECM replacement can exceed $1,000.

8. Can a bad battery cause the P1682 code on a 2018 Silverado?

Yes, a weak or failing battery may cause voltage irregularities that trigger the P1682 code. Testing and replacing the battery, if necessary, is a good starting point.

9. Will resetting the Check Engine Light clear the P1682 code permanently?

Clearing the code without addressing the root issue will only temporarily turn off the light. The code will return if the problem persists.

10. Can an aftermarket remote start system cause the P1682 code on a 2018 Chevrolet Silverado?

Yes, improperly installed aftermarket remote start systems can interfere with the ignition circuit and trigger the P1682 code. Disconnecting the remote start system may help identify the issue.