AutoCodes – GMC – B2600 2015 GMC Sierra

B2600 2015 GMC Sierra Code - Left Daytime Running Lamps Control Circuit

Quick Answer

The ambient light sensor is used to monitor outside lighting conditions. Common causes include Faulty Left Headlamp Assembly, Left Headlamp Assembly harness is open or shorted, Left 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: B2600 2015 GMC Sierra indicates Left Daytime Running Lamps Control Circuit.
Common causes: Common causes include Faulty Left Headlamp Assembly, Left Headlamp Assembly harness is open or shorted, Left 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 215

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 B2600 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 B2600 2015 GMC Sierra - Left Daytime Running Lamps Control Circuit - AutoCodes.com — B2600 2015 GMC Sierra Code - Left Daytime Running Lamps Control Circuit

What does this mean?

What are the Possible Causes of the DTC B2600 2015 GMC Sierra?

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

How to Fix the DTC B2600 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

B2600:01 Left Daytime Running Lamps Control Circuit short to Battery
B2600:02 Left Daytime Running Lamps Control Circuit Short to Ground
B2600:04 Left Daytime Running Lamps Control Circuit Open

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B2600 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 B2600 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 B2600 2015 GMC Sierra Code

1. What does the OBDII code B2600 mean on a 2015 GMC Sierra?

The code B2600 indicates a problem with the Left Daytime Running Lamps (DRL) Control Circuit, such as an open, short, or fault in the wiring or components.

2. What are the common symptoms of code B2600 on a 2015 GMC Sierra?

Symptoms include the left daytime running lamp not functioning, a warning on the dashboard, and potentially other lighting issues.

3. What causes the B2600 code to appear on a 2015 GMC Sierra?

Common causes include a blown bulb, faulty wiring, a bad DRL control module, a corroded connection, or a malfunctioning switch.

4. Can a blown bulb trigger the B2600 code?

Yes, a blown left daytime running lamp bulb is one of the most common causes of this code.

5. How can I diagnose the B2600 code on my 2015 GMC Sierra?

Start by checking the left daytime running lamp bulb, inspecting the wiring and connectors for damage or corrosion, and testing the DRL control module for proper operation.

6. Is the B2600 code serious for my 2015 GMC Sierra?

While it doesnâ€™t usually affect drivability, it can compromise visibility and safety, especially in low-light conditions, so it should be addressed promptly.

7. Can I fix the B2600 code myself on a 2015 GMC Sierra?

If the issue is a blown bulb or minor wiring problem, you can likely fix it yourself with basic tools. For more complex electrical issues, professional help may be required.

8. How do I reset the B2600 code after repairs?

After fixing the issue, clear the code with an OBDII scanner. If the issue is resolved, the code should not return.

9. How much does it cost to repair the B2600 code on a 2015 GMC Sierra?

Costs vary depending on the issue. Replacing a bulb might cost $10â€“$20, while repairing wiring or replacing a control module can cost $100â€“$300 or more.

10. Can cold weather affect the B2600 code on a 2015 GMC Sierra?

Yes, cold weather can cause connections to loosen or wires to become brittle, potentially triggering the B2600 code.