B2603
DRL Relay Control Circuit Shorted To Battery Positive Voltage
B2603 is an OBD-II diagnostic trouble code meaning: DRL Relay Control Circuit Shorted To Battery Positive Voltage. Common causes: short circuit in wiring harness, faulty drl relay. Estimated repair cost: $33–89.
Symptoms
- Daytime running lights do not turn on
- DRLs are constantly on (do not turn off)
- Dashboard warning light
- The error is stored in the ECU memory after reset
Causes
- Short circuit in wiring harness
- Faulty DRL relay
- Damage to wire insulation
- Problems in the relay power circuit
- Control unit malfunction
How to Fix
- Check the integrity of the wiring harness to the DRL relay
- Check the condition of the DRL relay (winding resistance)
- Check the voltage in the relay control circuit
- Inspect connections and connectors for oxidation
- If necessary, replace relays or damaged wires
- Clear error codes and check system operation
Related codes
FAQ
What does the B2603 code mean?
B2603 is an OBD-II diagnostic trouble code that indicates: DRL Relay Control Circuit Shorted To Battery Positive Voltage
What causes a B2603 error code?
The most common causes of B2603 include: Short circuit in wiring harness; Faulty DRL relay; Damage to wire insulation; Problems in the relay power circuit.
How do I fix a B2603 diagnostic trouble code?
To fix B2603: Check the integrity of the wiring harness to the DRL relay. Check the condition of the DRL relay (winding resistance). Check the voltage in the relay control circuit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B2603?
Limited driving only, diagnose soon
How much does it cost to fix B2603?
The estimated repair cost for B2603 is $33–89. Actual cost depends on your vehicle, location, and labor rates.
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