AutoCodes – Chevrolet – B2605 2018 Chevrolet Silverado

B2605 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 443

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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado - Right Daytime Running Lamps Control Circuit - AutoCodes.com — B2605 2018 Chevrolet Silverado Code - Right Daytime Running Lamps Control Circuit

What does this mean?

What are the Possible Causes of the DTC B2605 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado code?

Need more information on how to fix the B2605 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado Code

1. What does the OBDII code B2605 mean for a 2018 Chevrolet Silverado?

B2605 indicates an issue with the Right Daytime Running Lamps (DRL) Control Circuit, such as a fault in the wiring, bulb, or control module.

2. What are common symptoms of the B2605 code in a 2018 Chevrolet Silverado?

Symptoms may include the right daytime running lamp not functioning, a dashboard warning light, or intermittent operation of the DRL.

3. What causes the B2605 code to trigger in a 2018 Chevrolet Silverado?

Common causes include a burned-out DRL bulb, faulty wiring or connections, a damaged DRL module, or a failure in the body control module (BCM).

4. Can I still drive my 2018 Chevrolet Silverado with the B2605 code?

Yes, you can still drive the vehicle, but itâ€™s important to address the issue promptly as it affects visibility and safety.

5. How do I diagnose the B2605 code on a 2018 Chevrolet Silverado?

Start by checking the right daytime running lamp bulb for damage, inspect the wiring and connectors for corrosion or loose connections, and test the control circuit with a multimeter.

6. How can I fix the B2605 code on my 2018 Chevrolet Silverado?

Repair steps may include replacing a faulty DRL bulb, repairing or replacing damaged wiring, securing loose connectors, or replacing the DRL module if necessary.

7. How much does it cost to repair the B2605 code on a 2018 Chevrolet Silverado?

The cost varies depending on the cause, ranging from $10 to $50 for a bulb replacement to $150 or more for module repairs or professional diagnostics.

8. Can a weak battery cause the B2605 code in a 2018 Chevrolet Silverado?

While uncommon, a weak or failing battery can sometimes cause voltage issues that may trigger circuit-related codes like B2605.

9. Will resetting the code fix the issue in my 2018 Chevrolet Silverado?

Resetting the code may temporarily clear it, but the underlying issue must be resolved to prevent the code from returning.

10. Do I need specialized tools to fix the B2605 code on a 2018 Chevrolet Silverado?

Basic tools like a multimeter and a diagnostic scanner are helpful for identifying and resolving the issue, but in some cases, professional equipment may be required.