AutoCodes – Generic – B2605

B2605 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 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 6,745

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

What does this mean?

What are the Possible Causes of the DTC B2605?

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?

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 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 code?

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Need Help with the Code?

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Information for Specific Makes

B2605 Buick — Right Daytime Running Lamps Control Circuit
B2605 Cadillac — Right Daytime Running Lamps Control Circuit
B2605 Chevrolet — Right Daytime Running Lamps Control Circuit
B2605 GMC — Right Daytime Running Lamps Control Circuit
B2605 Infiniti — Park/Neutral Position Switch
B2605 Nissan — Park/Neutral Position Switch

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 Code

1. What are the common symptoms of OBDII code B2605 (Right Daytime Running Lamps Control Circuit)?

- The common symptoms include the right daytime running lamp not functioning, dim or flickering light, or a dashboard warning light.

2. What are the possible causes of OBDII code B2605?

- The code B2605 can be caused by a faulty daytime running lamp bulb, wiring issues, a defective control module, or a blown fuse.

3. How can I diagnose the cause of OBDII code B2605?

- To diagnose the issue, you can start by checking the right daytime running lamp bulb, inspecting the wiring harness for any damage, testing the control module, and verifying the fuse's condition.

4. Can I repair OBDII code B2605 on my own?

- Depending on the cause, you may be able to repair the issue yourself by replacing the faulty bulb, repairing damaged wiring, or replacing a blown fuse. However, complex issues may require professional assistance.

5. Are there any safety concerns associated with OBDII code B2605?

- Yes, driving with a malfunctioning daytime running lamp can reduce visibility to other drivers, especially during low-light conditions, increasing the risk of accidents. It is advisable to address this issue promptly.

6. How can I prevent OBDII code B2605 from recurring?

- To prevent the code from recurring, ensure proper maintenance of your vehicle's lighting system, promptly address any lighting issues, and regularly inspect the daytime running lamps for signs of wear or damage.

7. Is it safe to drive with OBDII code B2605 illuminated?

- While it may be safe to drive during daylight hours with a malfunctioning right daytime running lamp, it is not recommended to drive at night or in low visibility conditions. It is best to address the issue promptly.

8. Will OBDII code B2605 cause my vehicle to fail an emissions test?

- The code B2605 is related to the right daytime running lamp control circuit and is not directly linked to emissions. However, it is essential to address the issue to maintain the overall safety and functionality of your vehicle.

9. How much does it typically cost to repair OBDII code B2605?

- The cost of repairing OBDII code B2605 can vary depending on the cause of the issue, the extent of the repairs needed, and whether you choose to address it yourself or seek professional help. Costs may range from a simple bulb replacement to more complex wiring repairs.

10. Can OBDII code B2605 affect other systems in my vehicle?

- While the code specifically relates to the right daytime running lamps control circuit, electrical issues in one part of the vehicle can sometimes impact other systems. It's important to address the code promptly to prevent any potential cascading effects on other components.