Left turn signal circuit is open
What it means
B0534. Left turn signal circuit is open. The body control module cannot light the left turn indicator and the body warning light comes on.. This Chevy-enhanced code applies to Chevrolet, GMC, Buick, Cadillac, Pontiac, Oldsmobile and Saturn models that use this code.
Findings, check these first
- Faulty left turn signal lamp bulb
- Left turn signal lamp bulb harness open or shorted
- Poor electrical connection at the left turn signal lamp
- Faulty instrument panel cluster
- Faulty body control module
Standard procedure
- Confirm the code with a scan tool
- Inspect the left turn signal bulb and socket for damage
- Test the turn signal supply circuit for opens, shorts and poor connections
- Command the left turn signal with the scan tool and watch the lamp
- Replace the bulb, cluster or body control module only after circuit tests pass
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Sources and review
Review: checked against the recorded source material.
- B0534 CHEVROLET Code: Meaning, Causes, and Symptoms | OBD2 Codes - OBD2 Codes
live reference page (obd2-codes.co)
Supports: CHEVROLET and GM-family meaning and likely causes for B0534
Fetched directly. B0534 reads "Left Turn Signal Circuit Open".
- Code B0534 meaning and causes | OBDII.pro
live reference page (obdii.pro)
Supports: independent corroboration of the GM meaning
Fetched directly. obdii.pro is a separate publisher and gives the GM meaning as: LH turn signal circuit open More details about the error B0534 and possible reasons for its occurrence.
Last updated 2026-10-02.
Report a correction for B0534. Include your vehicle, the issue and a source if you have one.