Left Turn Signal Circuit Malfunction

The left turn signal indicator isn't working properly because of an issue in the circuit, which may be caused by a bad bulb, wiring, or the turn signal switch itself.

The Body Control Module (BCM) detects an abnormal voltage or resistance level in the left turn signal circuit when it checks for proper function, often expecting around 12-14 volts during operation.

Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.

1. 1Check the left turn signal bulb to see if it’s burnt out; replace if needed.
2. 2Inspect the wiring and connectors for any signs of corrosion or damage; repair as necessary.
3. 3Use a multimeter to check voltage at the turn signal switch when the signal is activated; you should see around 12V.
4. 4Test the left turn signal switch for proper operation; replace if the switch is not functioning correctly.
5. 5If all parts are functioning as they should, consider testing or replacing the Body Control Module.

• Burnt out left turn signal bulb
• Corroded connector or wiring damaged
• Faulty turn signal switch
• Short circuit in the left turn signal wiring
• Body Control Module failure

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