C1748 Ford Code - Switch Input Circuit Short To Ground

C1748 indicates a "Switch Input Circuit Short To Ground," meaning there is an electrical fault in the circuit associated with a switch input, such as a short to ground.

Symptoms may include malfunctioning switches (e.g., brake, clutch, or steering controls), warning lights on the dashboard, or a lack of response from specific vehicle systems.

Common causes include damaged or shorted wiring, a faulty switch, corroded connectors, or a malfunctioning control module.

While the vehicle may still be operable, it’s not recommended to ignore the issue, as it could impact the functionality of critical systems like braking or steering.

Start by inspecting the wiring and connectors for damage or corrosion, then use a multimeter to test for shorts to ground in the circuit. Check the switch associated with the circuit for proper function.

You’ll typically need an OBDII scanner, a multimeter to test electrical circuits, and wiring diagrams specific to your Ford model.

Repairs may involve replacing damaged wiring, repairing or replacing the faulty switch, cleaning corroded connectors, or reprogramming or replacing the control module if necessary.

Yes, a blown fuse in the affected circuit could cause the circuit to short to ground and trigger the C1748 code.

Repair costs vary depending on the root cause, but diagnosing and fixing wiring or a switch typically costs between $100 and $300, while module replacement may be more expensive.

Clearing the code without addressing the root cause will only temporarily remove it, as the issue will likely trigger the code again shortly after.