AutoCodes – Generic – B2600

B2600 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 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 10,523

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

What does this mean?

What are the Possible Causes of the DTC B2600?

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?

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 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 code?

Need more information on how to fix the B2600 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2600 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2600 Buick — Left Daytime Running Lamps Control Circuit
B2600 Cadillac — Left Daytime Running Lamps Control Circuit
B2600 Chevrolet — Left Daytime Running Lamps Control Circuit
B2600 GMC — Left Daytime Running Lamps Control Circuit
B2600 Infiniti — Configuration Error
B2600 Nissan — Configuration Error
B2600 Pontiac — Left Daytime Running Lamps Control Circuit

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 Code

1. What are the common symptoms of OBDII code B2600 (Left Daytime Running Lamps Control Circuit)?

- The common symptoms include the left daytime running lamp not functioning, flickering, or staying on constantly.

2. What are the possible causes of OBDII code B2600?

- The code B2600 may be triggered by issues such as a faulty daytime running lamp bulb, a damaged wiring harness, a defective lamp control module, or a problem with the vehicle's body control module.

3. How can I diagnose the cause of OBDII code B2600?

- You can start by visually inspecting the left daytime running lamp and its wiring for any visible damage. Using a multimeter, you can test the continuity of the wiring and check for any loose connections or corrosion.

4. Can I still drive my vehicle with OBDII code B2600 present?

- It is generally safe to drive with this code, but it is recommended to address the issue promptly to ensure the proper functioning of the left daytime running lamp.

5. How can I repair OBDII code B2600 myself?

- Depending on the cause, you may be able to replace the faulty bulb, repair damaged wiring, or replace the lamp control module yourself if you have the necessary tools and knowledge.

6. Will resetting the OBDII codes make OBDII code B2600 disappear?

- Resetting the codes may temporarily clear the B2600 code, but it will likely reappear if the underlying issue is not addressed.

7. Can extreme weather conditions cause OBDII code B2600 to trigger?

- Yes, extreme weather conditions such as heavy rain or snow may cause moisture to affect the left daytime running lamp circuit, leading to the B2600 trouble code.

8. Is it necessary to use an OBDII scanner to diagnose OBDII code B2600?

- Using an OBDII scanner is recommended to properly diagnose the B2600 trouble code and to clear it after the issue has been resolved.

9. How much does it typically cost to repair OBDII code B2600 at a professional auto repair shop?

- The cost of repairing OBDII code B2600 can vary depending on the cause of the issue and the labor rates of the auto repair shop. It is advisable to get a diagnosis and cost estimate from a professional technician.

10. Are there any recalls related to OBDII code B2600 affecting certain vehicle models?

- It is recommended to check with the vehicle manufacturer or visit the National Highway Traffic Safety Administration (NHTSA) website to see if there are any recalls related to OBDII code B2600 for your specific vehicle model.