AutoCodes – GMC – B2602 GMC

B2602 GMC 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 GMC 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 2,355

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

What does this mean?

What are the Possible Causes of the DTC B2602 GMC?

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 GMC?

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 GMC 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 GMC Code

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

- Common symptoms include non-functioning Daytime Running Lights (DRL), flickering or dim DRL, and illuminated DRL indicator on the dashboard.

2. What are the possible causes of the DRL Relay Control Circuit shorted to ground?

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

3. How can I diagnose the DRL Relay Control Circuit shorted to ground issue?

- Use a multimeter to test for continuity and voltage in the DRL circuit, inspect the wiring for any damage or corrosion, and check the DRL relay and module for proper operation.

4. Can I drive my vehicle with the DRL Relay Control Circuit shorted to ground?

- It is not recommended to drive the vehicle with a shorted DRL circuit as it can affect the visibility of your vehicle to other drivers, especially in low light conditions.

5. How do I repair the DRL Relay Control Circuit shorted to ground issue?

- Repair steps may include repairing or replacing damaged wiring, replacing the faulty DRL relay or module, and clearing the OBDII trouble code with a diagnostic scanner.

6. Are there any DIY tips for fixing the DRL Relay Control Circuit shorted to ground problem?

- DIY tips include checking and securing all electrical connections, inspecting the fuse related to the DRL circuit, and referring to the vehicle's service manual for specific troubleshooting steps.

7. Will disconnecting the DRL system solve the shorted to ground issue?

- Disconnecting the DRL system may temporarily disable the circuit, but it is not a recommended solution as it can compromise the safety of your vehicle, especially during daytime driving.

8. How much does it cost to repair the DRL Relay Control Circuit shorted to ground issue at a repair shop?

- The cost of repair can vary depending on the specific cause of the issue, but it may range from $100 to $300 for parts and labor at a repair shop.

9. Can a dealership service center help with diagnosing and fixing the DRL Relay Control Circuit shorted to ground problem?

- Yes, a dealership service center with qualified technicians and specialized diagnostic equipment can help diagnose and repair the DRL circuit issue effectively.

10. How can I prevent the DRL Relay Control Circuit from shorting to ground in the future?

- To prevent future issues, regularly inspect and maintain the DRL system, avoid overloading the electrical circuit, and address any warning signs promptly to prevent further damage.