Rear Left Turn Signal Circuit Malfunction
The B0034 code means the vehicle's onboard diagnostic system has detected: Rear Left Turn Signal Circuit Malfunction. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- easy
- Estimated cost
- $5 - $200 (parts and labor)
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Common Symptoms
- Rear left turn signal not flashing
- Fast blink rate on dash indicator
- Rear left signal stays solid
- Turn signal warning on instrument cluster
- Hazard lights only work on one side
Probable Causes (Ranked by Likelihood)
- Burned out rear left turn signal bulb Very High
- Corroded bulb socket in tail light assembly High
- Broken wiring to rear left turn signal Moderate
- Faulty turn signal relay or flasher module Low
Step-by-Step Diagnostic Procedure
-
Visually inspect rear left turn signal bulb
-
Check bulb socket for corrosion or melting
-
Test voltage at bulb socket with multimeter
-
Inspect wiring from body control module to rear light
-
Test turn signal relay operation
Frequently Asked Questions
Why is my turn signal blinking fast?
A fast blink rate, called hyperflash, is the most common indicator that one of the turn signal bulbs has burned out. It is designed to alert the driver to a bulb failure.
Can I fix this myself?
In most cases yes. A burned out bulb is the most common cause and typically costs under $10 and takes minutes to replace by accessing the bulb through the trunk or tail light housing.
Is it legal to drive without a working turn signal?
No. Functioning turn signals are required by law in all states. Driving without a working turn signal can result in a traffic citation and is a safety hazard.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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