AutoCodes – GMC – B2605 2016 GMC Sierra

B2605 2016 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 2016 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 205

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 2016 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 2016 GMC Sierra - Right Daytime Running Lamps Control Circuit - AutoCodes.com — B2605 2016 GMC Sierra Code - Right Daytime Running Lamps Control Circuit

What does this mean?

What are the Possible Causes of the DTC B2605 2016 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 2016 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 2016 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 2016 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 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code B2605 on a 2016 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 constantly.

2. What are the possible causes of OBDII code B2605 on a 2016 GMC Sierra?

- Possible causes may include a faulty right daytime running lamp bulb, a damaged wiring harness, or a malfunctioning control module.

3. How can I diagnose the Right Daytime Running Lamps Control Circuit issue on my 2016 GMC Sierra?

- To diagnose the issue, you can start by checking the right daytime running lamp bulb, inspecting the wiring for any damage, and using an OBDII scanner to read the trouble code.

4. What should I do if my right daytime running lamp is not working due to OBDII code B2605 on a 2016 GMC Sierra?

- If the right daytime running lamp is not working, start by checking and replacing the bulb. If the issue persists, further diagnosis by a professional may be needed.

5. Can I repair the Right Daytime Running Lamps Control Circuit issue on my 2016 GMC Sierra by myself?

- Depending on the cause of the issue, some repairs like bulb replacement can be done by yourself. However, complex wiring or module issues may require professional assistance.

6. Are there any temporary solutions if my right daytime running lamp is flickering due to OBDII code B2605 on a 2016 GMC Sierra?

- A temporary solution could be to disconnect the lamp to prevent any electrical issues or safety hazards until the problem is properly diagnosed and repaired.

7. Is it safe to continue driving my 2016 GMC Sierra with the Right Daytime Running Lamps Control Circuit issue?

- It is generally safe to drive, but it is recommended to get the issue diagnosed and repaired as soon as possible to ensure proper visibility and adherence to road regulations.

8. How much does it typically cost to repair the Right Daytime Running Lamps Control Circuit issue on a 2016 GMC Sierra?

- The cost of repair can vary depending on the exact cause of the issue. Simple fixes like bulb replacement may cost less, while complex wiring or module repairs can be more expensive.

9. Can extreme weather conditions affect the Right Daytime Running Lamps Control Circuit on a 2016 GMC Sierra?

- Yes, extreme weather conditions like moisture or extreme temperatures can potentially damage the wiring or components of the daytime running lamp system.

10. Will resetting the OBDII code B2605 on my 2016 GMC Sierra make the Right Daytime Running Lamps work again?

- Resetting the code may temporarily turn off the warning light, but it will not fix the underlying issue causing the Right Daytime Running Lamps Control Circuit problem. Proper diagnosis and repair are necessary.