AutoCodes – GMC – B2605 2017 GMC Sierra

B2605 2017 GMC Sierra Code - Right Daytime Running Lamps Control Circuit

Quick Answer

The ambient light sensor is used to monitor outside lighting conditions. Common causes include Faulty Right Headlamp Assembly, Right Headlamp Assembly harness is open or shorted, Right Headlamp Assembly 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: B2605 2017 GMC Sierra indicates Right Daytime Running Lamps Control Circuit.
Common causes: Common causes include Faulty Right Headlamp Assembly, Right Headlamp Assembly harness is open or shorted, Right Headlamp Assembly 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 211

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 May 26, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B2605 2017 GMC Sierra Description

The ambient light sensor is used to monitor outside lighting conditions. The ambient light sensor provides a voltage signal that will vary between 0.2 and 4.9 volts depending on outside lighting conditions. The Body Control Module (BCM) provides a 5-volt reference signal to the ambient light sensor and the Heating, Ventilation, and Air Conditioning (HVAC) control module provides a low reference ground. The BCM monitors the ambient light sensor signal circuit to determine if outside lighting conditions are correct for either Daytime Running Lights (DRL) or Automatic Lamp Control (ALC) when the headlamp switch is in the AUTO position. In daylight conditions, the BCM will command the DRLs ON. During low light conditions, the BCM will command the low beam headlamps ON. Any function or condition that turns on the headlamps will cancel the DRL operation. The Diagnostic Trouble Code (DTC) will be set when the BCM detects a problem in the left DRL control circuit.

OBDII Code B2605 2017 GMC Sierra - Right Daytime Running Lamps Control Circuit - AutoCodes.com — B2605 2017 GMC Sierra Code - Right Daytime Running Lamps Control Circuit

What does this mean?

What are the Possible Causes of the DTC B2605 2017 GMC Sierra?

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

How to Fix the DTC B2605 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

B2605:01 Right Daytime Running Lamps Control Circuit short to Battery
B2605:02 Right Daytime Running Lamps Control Circuit Short to Ground
B2605:04 Right Daytime Running Lamps Control Circuit Open

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B2605 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 B2605 2017 GMC Sierra code?

Need more information on how to fix the B2605 2017 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 B2605 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code B2605 in a 2017 GMC Sierra related to the Right Daytime Running Lamps Control Circuit?

Symptoms may include the right daytime running lamp not functioning properly or not turning on at all.

2. What are possible causes of OBDII code B2605 in a 2017 GMC Sierra?

Potential causes include a faulty daytime running lamp module, wiring issues, or a defective light bulb.

3. How can I diagnose the Right Daytime Running Lamps Control Circuit issue in my 2017 GMC Sierra?

You can use a diagnostic scanner to retrieve the specific trouble code B2605 and then inspect the wiring, connections, and components related to the right daytime running lamp.

4. Can a blown fuse cause OBDII code B2605 in a 2017 GMC Sierra?

Yes, a blown fuse related to the right daytime running lamp circuit can trigger this error code.

5. What repair steps can I take to fix OBDII code B2605 in my 2017 GMC Sierra?

You may need to replace the faulty daytime running lamp module, repair any damaged wiring, or replace a defective light bulb to resolve the issue.

6. Is it possible to reset the OBDII code B2605 in a 2017 GMC Sierra without fixing the underlying problem?

While you can clear the code with an OBDII scanner, it's crucial to address the root cause to prevent the issue from recurring.

7. Can weather conditions impact the Right Daytime Running Lamps Control Circuit in a 2017 GMC Sierra?

Extreme weather conditions like heavy rain or snow may contribute to wiring corrosion or connection issues that can affect the proper functioning of the right daytime running lamp circuit.

8. How do I prevent OBDII code B2605 from appearing in my 2017 GMC Sierra again?

Regularly inspecting and maintaining the daytime running lamp system, checking for any signs of wear or damage, can help prevent this trouble code from reoccurring.

9. Is it safe to continue driving my 2017 GMC Sierra with OBDII code B2605 related to the Right Daytime Running Lamps Control Circuit?

It's best to address the issue promptly to ensure proper visibility and safety while driving, especially during low-light conditions.

10. Can a professional mechanic help diagnose and repair OBDII code B2605 in my 2017 GMC Sierra?

Yes, a qualified mechanic with the right tools and expertise can efficiently diagnose the issue and perform the necessary repairs to resolve the Right Daytime Running Lamps Control Circuit problem.