Engine-Codes - Generic - B0503

B0503 Code - Short To Voltage Or BCM Open Internally In The RH DRL Relay Control Circuit

- Code Popularity: 1,236 Views
- Repair Importance Level: 1/3
- Repair Difficulty Level: 2/3
Table of contents

|What are the Possible Causes of the Code B0503?

  • 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 B0503 Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|What is the Cost to Diagnose the Code B0503?

Labor: 1.0

The cost to diagnose the B0503 code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

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|What are Code B0503 Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|What Does the B0503 Code Mean?

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.

Short To Voltage Or BCM Open Internally In The RH DRL Relay Control Circuit

|Need more Information on the B0503 Code?

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|Code B0503 Information for Specific Makes

  • B0503 Buick Short To Voltage Or BCM Open Internally In The RH DRL Relay Control Circuit
  • B0503 Cadillac Short To Voltage Or BCM Open Internally In The RH DRL Relay Control Circuit
  • B0503 Chevrolet Short To Voltage Or BCM Open Internally In The RH DRL Relay Control Circuit
  • B0503 GMC Short To Voltage Or BCM Open Internally In The RH DRL Relay Control Circuit

|Need Help with the B0503 Code?

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