B1798 Code - Lamp Turn Signal Front Output Circuit Failure

The code B1798 indicates a failure in the front turn signal lamp output circuit, meaning the system has detected an issue with the wiring, bulb, or related components.

Symptoms include a non-functioning front turn signal, rapid blinking of the turn signal indicator on the dashboard, or a warning light for the lighting system.

Common causes include a burned-out turn signal bulb, damaged wiring, a corroded bulb socket, or a malfunctioning turn signal relay or control module.

Start by inspecting the front turn signal bulb, wiring, and socket for damage or corrosion. Use a multimeter to test for proper voltage in the circuit and check the turn signal relay or module.

While the vehicle may still be drivable, it is unsafe and illegal to drive without functioning turn signals. Address the issue promptly to avoid accidents or traffic violations.

Repairs may involve replacing the turn signal bulb, cleaning or replacing a corroded socket, repairing damaged wiring, or replacing the turn signal relay or control module if faulty.

Repair costs can range from $10 to $50 for a bulb or socket replacement to $100–$300 for more complex wiring or module repairs, depending on labor rates and parts.

A weak battery is unlikely to directly cause this code, but electrical issues stemming from low voltage could exacerbate circuit problems in rare cases.

Clearing the code without addressing the underlying issue will only temporarily remove the alert. The code will likely return until the root cause is fixed.

Regularly inspect and maintain your vehicle's lighting system, check for corrosion in sockets, and promptly replace burned-out bulbs to avoid circuit failures.