AutoCodes – Generic – B0502

B0502 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 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 2,779

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B0502 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 - Open Or Short To Ground In The RH DRL Relay Control Circuit - AutoCodes.com — B0502 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?

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?

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 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 B0502 code?

Need more information on how to fix the B0502 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0502 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B0502 Buick — Open Or Short To Ground In The RH DRL Relay Control Circuit
B0502 Cadillac — Open Or Short To Ground In The RH DRL Relay Control Circuit
B0502 Chevrolet — Open Or Short To Ground In The RH DRL Relay Control Circuit
B0502 GMC — Open Or Short To Ground In The RH DRL Relay Control Circuit

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 Code

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

- Common symptoms include non-functioning right-hand daytime running lights (DRL) or flickering DRL lights on the vehicle.

2. What does OBDII code B0502 mean?

- OBDII code B0502 indicates an open or short to ground in the right-hand DRL relay control circuit.

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

- Possible causes include a faulty DRL relay, damaged wiring in the right-hand DRL circuit, or a poor connection in the circuit.

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

- You can diagnose the issue by inspecting the wiring in the right-hand DRL circuit, testing the DRL relay, and checking for loose or corroded connections.

5. Can OBDII code B0502 be fixed at home?

- Depending on your level of expertise, you may be able to fix OBDII code B0502 at home by identifying and repairing the open or short to ground in the right-hand DRL relay control circuit.

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

- It is not recommended to drive with OBDII code B0502 unresolved, as it may affect the proper functioning of the right-hand DRL lights, reducing visibility and safety on the road.

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

- The cost of repairing OBDII code B0502 can vary depending on the specific cause of the issue, but it may involve replacing the DRL relay, repairing wiring, or addressing connection problems.

8. Are there any preventative measures to avoid OBDII code B0502?

- To prevent OBDII code B0502, it is advisable to regularly inspect the DRL circuit wiring, ensure proper connections, and address any issues promptly to avoid potential shorts or opens in the circuit.

9. Can OBDII code B0502 cause other problems in the vehicle?

- While OBDII code B0502 specifically relates to the right-hand DRL relay control circuit, unresolved issues with this code may lead to further electrical problems or malfunctions in the vehicle's lighting system.

10. How urgent is it to address OBDII code B0502?

- It is recommended to address OBDII code B0502 in a timely manner to ensure the proper functioning of the right-hand DRL lights and maintain optimal visibility while driving.