AutoCodes – GMC – B2605 2015 GMC Sierra

B2605 2015 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 2015 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 177

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 2015 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 2015 GMC Sierra - Right Daytime Running Lamps Control Circuit - AutoCodes.com — B2605 2015 GMC Sierra Code - Right Daytime Running Lamps Control Circuit

What does this mean?

What are the Possible Causes of the DTC B2605 2015 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 2015 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 2015 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 2015 GMC Sierra 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 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code B2605 in a 2015 GMC Sierra related to the Right Daytime Running Lamps Control Circuit?

The common symptoms include the right daytime running lamp not functioning, flickering, or staying on when it shouldn't be.

2. What are the possible causes of OBDII code B2605 in a 2015 GMC Sierra?

Potential causes include a faulty daytime running lamp bulb, a problem with the wiring or connections, a malfunctioning lamp control module, or a blown fuse.

3. How can I diagnose the issue causing OBDII code B2605 in my 2015 GMC Sierra?

You can start by visually inspecting the right daytime running lamp, checking the wiring and connections for any damage, testing the lamp control module, and verifying the fuse related to the circuit.

4. Can I repair OBDII code B2605 in my 2015 GMC Sierra myself?

Depending on the exact cause, you may be able to repair it yourself by replacing a faulty bulb, fixing wiring issues, or replacing a defective lamp control module. However, if you're unsure, it's best to consult a professional mechanic.

5. Is it safe to continue driving with OBDII code B2605 in my 2015 GMC Sierra?

If the issue is only related to the right daytime running lamp and doesn't affect the vehicle's overall functionality or safety, it may be safe to drive. However, it's best to address the problem promptly to ensure proper visibility and compliance with regulations.

6. How much does it typically cost to repair OBDII code B2605 in a 2015 GMC Sierra?

The cost of repair can vary depending on the cause of the issue. Simple fixes like replacing a bulb may cost less, while more complex problems like a faulty lamp control module could be more expensive. It's recommended to get a diagnostic from a mechanic for an accurate estimate.

7. Will resetting the OBDII code B2605 in my 2015 GMC Sierra make the issue go away?

Resetting the code may temporarily turn off the warning light, but it won't fix the underlying problem causing the code to trigger. It's important to diagnose and address the root cause to prevent the code from reoccurring.

8. Can extreme weather conditions cause OBDII code B2605 to appear in a 2015 GMC Sierra?

Extreme weather conditions such as heavy rain, snow, or extreme temperatures can potentially damage the daytime running lamp components or wiring, leading to issues like OBDII code B2605. Inspecting and maintaining these components regularly can help prevent weather-related problems.

9. Are there any preventive measures to avoid OBDII code B2605 in a 2015 GMC Sierra?

Regularly inspecting the condition of the daytime running lamps, keeping the connections clean and secure, and ensuring proper maintenance of the lighting system can help prevent issues that may trigger OBDII code B2605.

10. Will OBDII code B2605 affect the overall performance of my 2015 GMC Sierra?

OBDII code B2605 specifically relates to the right daytime running lamp control circuit, so it shouldn't affect the overall performance of the vehicle. However, it's still important to address the issue to maintain proper lighting functionality and compliance with regulations.