AutoCodes – Buick – B0507 Buick

B0507 Buick Code - Open Or Short To Ground In The LH DRL Relay Control Circuit

Quick Answer

The Body Control Module (BCM) provides control for the LH DRL relay circuit. Common causes include Faulty Left Daylight Running Lamp (DRL) Relay, Left Daylight Running Lamp (DRL) Relay harness is open or shorted, Left Daylight Running Lamp (DRL) Relay circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B0507 Buick indicates Open Or Short To Ground In The LH DRL Relay Control Circuit.
Common causes: Common causes include Faulty Left Daylight Running Lamp (DRL) Relay, Left Daylight Running Lamp (DRL) Relay harness is open or shorted, Left Daylight Running Lamp (DRL) Relay circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 1,051

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 11, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B0507 Buick Description

The Body Control Module (BCM) provides control for the LH DRL relay circuit. The BCM grounds the Left Daylight Running Lamp (DRL) relay control circuit in order to energize the LH DRL relay and turn ON the LF turn signal This allows the LF turn signal to be used for DRL and approach lighting functions. The BCM monitors the voltage level on the LH DRL relay control circuit. When the BCM commands the relay ON, the voltage level on the LH DRL relay control circuit should be low. When the relay is OFF, the voltage on the LH DRL relay control circuit should be high. If the BCM detects a voltage level other than expected, a malfunction is present and a Diagnostic Trouble Code (DTC) will set.

OBDII Code B0507 Buick - Open Or Short To Ground In The LH DRL Relay Control Circuit - AutoCodes.com — B0507 Buick Code - Open Or Short To Ground In The LH DRL Relay Control Circuit

What does this mean?

What are the Possible Causes of the DTC B0507 Buick?

Faulty Left Daylight Running Lamp (DRL) Relay
Left Daylight Running Lamp (DRL) Relay harness is open or shorted
Left Daylight Running Lamp (DRL) Relay circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B0507 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 B0507 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 B0507 Buick Code

1. What does the OBDII code B0507 mean for a Buick?

The code B0507 indicates an open or short to ground in the Left-Hand DRL (Daytime Running Light) relay control circuit.

2. What are the common symptoms of the B0507 code?

Symptoms may include the left-hand daytime running light not working, the DRL indicator on the dash malfunctioning, or no visible warning at all.

3. What causes the B0507 code in a Buick?

Common causes include a faulty DRL relay, damaged wiring or connectors, a blown fuse, or a malfunctioning BCM (Body Control Module).

4. How do I diagnose the B0507 code?

Start by checking the DRL relay, inspecting the wiring and connectors for damage, and testing the circuit for continuity or grounding issues.

5. Can a blown fuse cause the B0507 code?

Yes, a blown fuse in the DRL circuit can trigger the B0507 code as it interrupts the circuitâ€™s functionality.

6. How do I fix the B0507 code on my Buick?

Repairs may include replacing the DRL relay, repairing or replacing damaged wiring, cleaning corroded connectors, or addressing issues with the Body Control Module.

7. Is the B0507 code a serious issue?

While it does not affect engine performance, it can compromise visibility and safety due to malfunctioning daytime running lights.

8. Can I drive my Buick with the B0507 code?

Yes, but it is recommended to repair the issue promptly to ensure proper functionality of the daytime running lights for safety.

9. What tools are needed to troubleshoot the B0507 code?

Youâ€™ll need a multimeter to test the circuit, a scan tool to read and clear codes, and potentially wiring diagrams for your specific Buick model.

10. Does the Body Control Module need replacement for the B0507 code?

Only if the BCM is found to be faulty after ruling out other potential issues like relays, fuses, and wiring problems.

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