B3951 Cadillac Code - Right Rear Turn Signal Circuit

B3951 indicates a fault in the right rear turn signal circuit, typically involving an open, short, or malfunction in the wiring or components controlling the turn signal.

Symptoms include the right rear turn signal not working, hyper-flashing of the turn signal indicator, or a warning on the dashboard about a turn signal malfunction.

Common causes include a burned-out turn signal bulb, faulty wiring, corroded connectors, a damaged turn signal socket, or a malfunctioning Body Control Module (BCM).

Inspect the right rear turn signal bulb for damage or burnout and replace it if necessary. Also, verify if the bulb socket is clean and free of corrosion.

Yes, a malfunctioning Body Control Module can disrupt the turn signal circuit and trigger the B3951 code, but this is less common than wiring or bulb issues.

Inspect the wiring harness for the right rear turn signal for visible damage, corrosion, or disconnections. Repair or replace any damaged sections.

While the vehicle may still be drivable, a malfunctioning turn signal can create a safety hazard and should be repaired promptly to ensure proper signaling.

Clearing the code without addressing the underlying problem will likely cause the code to return. The fault in the circuit must be diagnosed and repaired first.

You’ll need an OBDII scanner to read and clear codes, a multimeter to check for continuity and voltage in the circuit, and basic hand tools for bulb or wiring replacement.

Repair costs vary depending on the issue. Replacing a bulb may cost under $20, while fixing wiring or replacing a BCM could cost several hundred dollars, including labor.