AutoCodes – GMC – B0502 GMC

B0502 GMC Code - Open Or Short To Ground In The RH DRL Relay Control Circuit

Quick Answer

The Body Control Module (BCM) provides control for the Right Daylight Running Lamp (DRL) relay circuit. Common causes include Faulty Right Daylight Running Lamp (DRL) Relay, Right Daylight Running Lamp (DRL) Relay harness is open or shorted, Right 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: B0502 GMC indicates Open Or Short To Ground In The RH DRL Relay Control Circuit.
Common causes: Common causes include Faulty Right Daylight Running Lamp (DRL) Relay, Right Daylight Running Lamp (DRL) Relay harness is open or shorted, Right 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 927

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 B0502 GMC Description

The Body Control Module (BCM) provides control for the Right Daylight Running Lamp (DRL) relay circuit. The BCM grounds the RH DRL relay control circuit in order to energize the RH DRL relay and turn ON the RF turn signal. This allows the RF turn signal to be used for DRL and approach lighting functions. The BCM monitors the voltage level on the RH DRL relay control circuit. When the BCM commands the relay ON, the voltage level on the RH DRL relay control circuit should be low. When the relay is OFF, the voltage on the RH 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 B0502 GMC - Open Or Short To Ground In The RH DRL Relay Control Circuit - AutoCodes.com — B0502 GMC Code - Open Or Short To Ground In The RH DRL Relay Control Circuit

What does this mean?

What are the Possible Causes of the DTC B0502 GMC?

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

How to Fix the DTC B0502 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 B0502 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 B0502 GMC Code

1. What are the common symptoms of OBDII code B0502 GMC?

- Common symptoms include the right headlight not working, flickering or dimming of the right headlight, or the right headlight staying on constantly.

2. What does OBDII code B0502 GMC indicate?

- This code indicates an open or short to ground in the right headlight daytime running lamp (DRL) relay control circuit.

3. What are the possible causes of OBDII code B0502 GMC?

- Possible causes include damaged wiring in the right DRL relay control circuit, a faulty DRL relay, a malfunctioning DRL module, or a poor electrical connection.

4. How can I diagnose the issue related to OBDII code B0502 GMC?

- You can use a multimeter to test the continuity of the wiring in the right DRL relay control circuit, check the DRL relay for proper functioning, and inspect the electrical connections for any corrosion or damage.

5. Can I repair OBDII code B0502 GMC myself?

- Depending on your skill level and access to tools, you may be able to repair this issue yourself by replacing the damaged wiring, faulty relay, or addressing any poor connections.

6. Is it safe to continue driving with OBDII code B0502 GMC?

- It is not recommended to drive with this code present, as it can affect the proper functioning of your vehicle's right headlight, compromising visibility and safety.

7. How much does it typically cost to repair OBDII code B0502 GMC?

- The cost of repair can vary depending on the specific cause of the issue, but it may involve replacing wiring, relays, or modules, which can range from a few hundred dollars to over a thousand dollars.

8. Can a faulty DRL relay cause other issues in the vehicle?

- Yes, a faulty DRL relay can cause issues such as intermittent or non-functioning right headlight, draining of the battery, or triggering of other related warning lights on the dashboard.

9. Will resetting the OBDII code B0502 GMC make the issue go away?

- Resetting the code may temporarily clear the warning light, but it will not fix the underlying issue causing the code to appear. It is important to diagnose and repair the problem to prevent further issues.

10. How long does it take to repair OBDII code B0502 GMC?

- The repair time can vary depending on the extent of the issue and the specific components that need to be addressed. It may take a few hours to a full day to complete the repair.