AutoCodes – Chevrolet – B2740 2017 Chevrolet Silverado

B2740 2017 Chevrolet Silverado Code - Front Fog Lamp Switch Circuit Malfunction

Quick Answer

The front fog lamp relay is supplied with battery voltage at all times. Common causes include Faulty Headlamp Switch, Headlamp Switch harness is open or shorted, Headlamp 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: B2740 2017 Chevrolet Silverado indicates Front Fog Lamp Switch Circuit Malfunction.
Common causes: Common causes include Faulty Headlamp Switch, Headlamp Switch harness is open or shorted, Headlamp 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 167

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 Jun 01, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2740 2017 Chevrolet Silverado Description

The front fog lamp relay is supplied with battery voltage at all times. The front fog lamp switch signal circuit is grounded momentarily by pressing the front fog lamp switch. The Body Control Module (BCM) energizes the front fog lamp relay by applying ground to the front fog lamp relay control circuit. When the front fog lamp relay is energized, the relay switch contacts close, and battery voltage is applied through the fog lamp fuse to the front fog lamp control circuit which illuminates the front fog lamps. With the front fog lamp switch activated the BCM sends a message via serial data to the instrument cluster requesting the instrument cluster to illuminate the front fog indicator. The Diagnostic Trouble Code (DTC) sets when the BCM detects a short to ground in the front fog lamp switch signal circuit.

OBDII Code B2740 2017 Chevrolet Silverado - Front Fog Lamp Switch Circuit Malfunction - AutoCodes.com — B2740 2017 Chevrolet Silverado Code - Front Fog Lamp Switch Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC B2740 2017 Chevrolet Silverado?

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

How to Fix the DTC B2740 2017 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B2740 2017 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 B2740 2017 Chevrolet Silverado code?

Need more information on how to fix the B2740 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 B2740 2017 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code B2740 on a 2017 Chevrolet Silverado?

- Common symptoms include non-functioning front fog lamps, illuminated dashboard warning light, and the inability to turn on or off the fog lamps.

2. What are some possible causes of the Front Fog Lamp Switch Circuit Malfunction (B2740) in a 2017 Chevrolet Silverado?

- Possible causes may include a faulty fog lamp switch, damaged wiring or connectors in the circuit, blown fuses, or issues with the fog lamp control module.

3. How can I diagnose the Front Fog Lamp Switch Circuit Malfunction (B2740) in my 2017 Chevrolet Silverado?

- You can start by checking the fuse related to the front fog lamps, inspecting the wiring and connectors for any visible damage, and testing the fog lamp switch for functionality using a multimeter.

4. Can I continue driving my 2017 Chevrolet Silverado with the B2740 trouble code?

- While it may be safe to drive, it is recommended to address the issue promptly to ensure proper functioning of the front fog lamps and to prevent potential electrical problems.

5. Is it possible to reset the B2740 trouble code on a 2017 Chevrolet Silverado without fixing the issue?

- Simply clearing the trouble code without addressing the underlying problem will likely result in the code reappearing once the issue is detected again by the vehicle's diagnostic system.

6. What are some repair tips for fixing the Front Fog Lamp Switch Circuit Malfunction (B2740) in a 2017 Chevrolet Silverado?

- Repair tips include checking and replacing any blown fuses, repairing or replacing damaged wiring or connectors, testing and replacing the fog lamp switch if necessary, and ensuring proper connection to the fog lamp control module.

7. Can extreme weather conditions contribute to the Front Fog Lamp Switch Circuit Malfunction (B2740) in a 2017 Chevrolet Silverado?

- Extreme weather conditions such as heavy rain, snow, or intense heat can potentially cause electrical components to malfunction, leading to issues with the front fog lamp circuit.

8. How much does it typically cost to repair the Front Fog Lamp Switch Circuit Malfunction (B2740) in a 2017 Chevrolet Silverado?

- The cost of repair can vary depending on the specific cause of the issue, but it may involve expenses for parts replacement, labor costs, and diagnostic fees from a mechanic or dealership.

9. Are there any recalls or technical service bulletins related to the B2740 trouble code in a 2017 Chevrolet Silverado?

- It's recommended to check with Chevrolet authorized service centers or online databases for any relevant recalls or technical service bulletins related to the Front Fog Lamp Switch Circuit Malfunction (B2740) in a 2017 Silverado.

10. How important is it to address the Front Fog Lamp Switch Circuit Malfunction (B2740) promptly in a 2017 Chevrolet Silverado?

- Promptly addressing the issue is important to ensure proper operation of the front fog lamps, maintain vehicle safety, and prevent potential electrical problems that could affect other systems in the vehicle.