Right Reverse Light Circuit Malfunction
The B0043 code means the vehicle's onboard diagnostic system has detected: Right Reverse Light Circuit Malfunction. This is a moderate severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- easy
- Estimated cost
- $5 - $250 (parts and labor)
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Common Symptoms
- Right reverse light not illuminating in reverse
- Only left reverse light works
- Reduced visibility when backing up at night
- Reverse light failure message on display
- Backup area poorly lit on right side
Probable Causes (Ranked by Likelihood)
- Burned out right reverse light bulb Very High
- Corroded or melted reverse light socket High
- Open circuit in right reverse light wiring Moderate
- Poor ground at right tail light assembly Low
Step-by-Step Diagnostic Procedure
-
Check right reverse light bulb condition
-
Inspect socket for damage or corrosion
-
Test voltage at socket in reverse gear
-
Check ground connection at tail light assembly
-
Inspect wiring between junction and right reverse light
Frequently Asked Questions
Why do both reverse lights need to work?
Having both reverse lights functional provides maximum visibility to pedestrians and other drivers behind you, signaling that you are backing up and illuminating the area behind the vehicle.
Can a transmission problem cause this?
If both reverse lights are out, a faulty reverse light switch or transmission range sensor is possible. If only one is out, it is more likely a bulb, socket, or wiring issue on that side.
What bulb type is used for reverse lights?
Common reverse light bulbs include types 921, 3156, 7440, and W16W. The correct type varies by vehicle, so check your owner's manual or the old bulb markings.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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