B2603 Code – DRL Relay Control Circuit Shorted To Battery Positive Voltage

What are the Possible Causes of the Code B2603?
  • Faulty Daytime Running Lamps (DRL) Relay
  • Daytime Running Lamps (DRL) Relay harness is open or shorted
  • Daytime Running Lamps (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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