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

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)
  • Need help with this OBD II code? Our mechanics are available within west Michigan to help. Outside of our service area? Visit our Car Help Section where you can ask questions and get answers.

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