AutoCodes – GMC – B2742 GMC

B2742 GMC Code - Front Fog Lamp Switch Circuit Low

Quick Answer

The fog lamp switch provides a ground input into the Body Control Module (BCM) for the fog lamp switch state input when the switch is pressed. Common causes include Faulty Front Fog Lamp Switch, Front Fog Lamp Switch harness is open or shorted, Front Fog Lamp 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: B2742 GMC indicates Front Fog Lamp Switch Circuit Low.
Common causes: Common causes include Faulty Front Fog Lamp Switch, Front Fog Lamp Switch harness is open or shorted, Front Fog Lamp 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 517

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 26, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2742 GMC Description

The fog lamp switch provides a ground input into the Body Control Module (BCM) for the fog lamp switch state input when the switch is pressed. This input is used by the BCM to control the fog lamps. The Diagnostic Trouble Code (DTC) sets when the BCM detects a short to ground in the fog lamp switch signal circuit for longer than 60 seconds.

OBDII Code B2742 GMC - Front Fog Lamp Switch Circuit Low - AutoCodes.com — B2742 GMC Code - Front Fog Lamp Switch Circuit Low

What does this mean?

What are the Possible Causes of the DTC B2742 GMC?

Faulty Front Fog Lamp Switch
Front Fog Lamp Switch harness is open or shorted
Front Fog Lamp Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B2742 GMC?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B2742 GMC 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.

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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 B2742 GMC Code

1. What are the common symptoms of OBDII code B2742 GMC (Front Fog Lamp Switch Circuit Low)?

- The common symptoms include the front fog lamps not turning on, flickering lights, or a dashboard warning light indicating an issue.

2. What are the possible causes of OBDII code B2742 GMC?

- The code B2742 GMC may be caused by a faulty front fog lamp switch, damaged wiring or connectors in the circuit, or a malfunctioning control module.

3. How can I diagnose the Front Fog Lamp Switch Circuit Low issue?

- To diagnose the issue, you can start by checking the front fog lamp switch for proper functionality, inspecting the wiring and connectors for any damage, and using an OBDII scanner to retrieve the specific trouble codes.

4. What are the recommended repair tips for resolving OBDII code B2742 GMC?

- Repair tips include repairing or replacing the front fog lamp switch, repairing any damaged wiring or connectors, and resetting the fault codes after the repairs are completed.

5. Can I drive my vehicle with OBDII code B2742 GMC present?

- It is generally safe to drive your vehicle with this code, but it is recommended to address the issue promptly to ensure proper functioning of the front fog lamps.

6. How much does it typically cost to repair OBDII code B2742 GMC?

- The cost of repair can vary depending on the specific cause of the issue, but it may involve parts and labor expenses ranging from $50 to $200 or more.

7. Can I reset OBDII code B2742 GMC without fixing the underlying issue?

- While you can clear the code with an OBDII scanner, it is not recommended to do so without addressing the root cause, as the issue may persist and potentially affect your vehicle's performance.

8. Is OBDII code B2742 GMC a serious problem?

- OBDII code B2742 GMC (Front Fog Lamp Switch Circuit Low) is not usually a serious problem in terms of safety, but it can affect the functionality of your front fog lamps and should be addressed to maintain proper visibility while driving.

9. How long does it take to repair OBDII code B2742 GMC?

- The repair time can vary depending on the extent of the issue and the expertise of the technician, but it typically takes between 1 to 2 hours to diagnose and fix the problem.

10. Can I fix OBDII code B2742 GMC myself?

- If you have experience with automotive electrical systems and the necessary tools, you may be able to fix the issue yourself by following repair guides or consulting with a professional for guidance.