RLC 002370.03 – Right Front Turn-Signal Light, Voltage Too High

RLC 002370.03 (RLC 2370.03)

Code: 002370.03

Shortcode: 2370.03


This diagnostic trouble code is generated if a voltage higher than 16 volts is registered at the output to the right turn-signal light on the front. This indicates a short circuit to a positive lead.


When this error is detected, the control software may experience limited or no functionality of the front right turn signal light.


  • Inspect Turn Signal Circuit:
    • Check the wiring and connectors associated with the right front turn-signal light for signs of short circuits to a positive lead. Look for damaged insulation or exposed wires. Repair or replace any compromised wiring.
  • Verify Voltage Regulation:
    • Ensure the voltage regulator is functioning correctly and maintaining proper voltage levels. Replace the regulator if it is faulty.
  • Test Turn Signal Light:
    • Test the right front turn-signal light to ensure it is not damaged or causing the voltage increase. Replace any faulty light components.
  • Check Power Supply:
    • Ensure the power supply to the turn signal light is stable and within the specified range. Inspect for any issues that could cause an overvoltage condition.


Excessive voltage can damage the turn-signal light and associated circuitry. Regular inspection and maintenance of the electrical system are essential to prevent such issues.

Control Units: John Deere

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