AutoCodes – Buick – B2602 Buick

B2602 Buick Code - DRL Relay Control Circuit Shorted To Ground

Quick Answer

The Daytime Running Lamps (DRL) Relay is controlled by the Body Control Module (BCM). Common causes include Faulty Daytime Running Lamps (DRL) Relay, Daytime Running Lamps (DRL) Relay harness is open or shorted, Daytime Running Lamps (DRL) Relay 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: B2602 Buick indicates DRL Relay Control Circuit Shorted To Ground.
Common causes: Common causes include Faulty Daytime Running Lamps (DRL) Relay, Daytime Running Lamps (DRL) Relay harness is open or shorted, Daytime Running Lamps (DRL) Relay 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 629

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 Jan 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2602 Buick Description

The Daytime Running Lamps (DRL) Relay is controlled by the Body Control Module (BCM). Ignition positive voltage is applied to the DRL relay coil. The BCM grounds the DRL relay control circuit in order to turn on the DRL relay. When the DRL relay control circuit becomes shorted to ground without being commanded on by the BCM, DTC B2602 is set.

OBDII Code B2602 Buick - DRL Relay Control Circuit Shorted To Ground - AutoCodes.com — B2602 Buick Code - DRL Relay Control Circuit Shorted To Ground

What does this mean?

What are the Possible Causes of the DTC B2602 Buick?

Faulty Daytime Running Lamps (DRL) Relay
Daytime Running Lamps (DRL) Relay harness is open or shorted
Daytime Running Lamps (DRL) Relay circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B2602 Buick?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B2602 Buick 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.

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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 B2602 Buick Code

1. What are the common symptoms of OBDII code B2602 Buick (DRL Relay Control Circuit Shorted To Ground)?

- Common symptoms include the daytime running lights not working, flickering or staying on constantly, and the DRL indicator light illuminated on the dashboard.

2. What can cause the DRL relay control circuit to short to ground in a Buick?

- Possible causes include damaged wiring or connectors, a faulty DRL relay, a short circuit in the wiring harness, or a malfunctioning DRL control module.

3. How serious is the OBDII code B2602 Buick (DRL Relay Control Circuit Shorted To Ground)?

- While this code may not affect the overall drivability of the vehicle, it can impact visibility and safety, especially during daytime driving conditions.

4. Can I continue driving my Buick with the DRL relay control circuit shorted to ground?

- It is not recommended to drive the vehicle with this issue, as it can compromise the proper functioning of the daytime running lights, affecting visibility to other drivers on the road.

5. How can I diagnose and repair OBDII code B2602 in my Buick?

- A thorough inspection of the DRL system, including checking the wiring, connectors, relay, and control module, is necessary. Repair or replace any damaged components as needed.

6. Is it possible to reset the OBDII code B2602 Buick without fixing the issue?

- Clearing the code without addressing the underlying problem will likely result in the code returning once the system detects the fault again.

7. Are there any troubleshooting tips for resolving the DRL relay control circuit short to ground issue?

- Start by visually inspecting the wiring and connectors for any signs of damage or corrosion. Testing the DRL relay and control module with a multimeter can help pinpoint the faulty component.

8. Can extreme weather conditions contribute to the DRL relay control circuit shorting to ground?

- Yes, extreme heat or moisture can sometimes lead to electrical issues in the DRL system, causing shorts or malfunctions that trigger the B2602 trouble code.

9. Will fixing the DRL relay control circuit issue improve the overall performance of my Buick?

- While resolving the DRL relay control circuit fault may not directly affect the performance of the vehicle, it is crucial for ensuring the proper functioning of the daytime running lights.

10. How long does it typically take to repair the DRL relay control circuit shorted to ground in a Buick?

- The repair time can vary depending on the exact cause of the issue and the complexity of accessing the components. It is recommended to consult a professional mechanic for an accurate estimate.