If the fault only appears when a trailer is hitched, the issue is almost certainly in the trailer lead or the trailer's own lighting system. Swap the cable with a known working one to isolate the problem. 4. The "Hard Reset"

Understanding these codes is essential for reducing downtime and avoiding expensive dealership diagnostics for simple wiring issues. What is the Iveco Stralis RFC Module?

If you see an RFC error on the dash, follow these steps before heading to the shop: 1. Check the Bulbs and Sockets

If you receive codes related to "Communication Timeout" or "CAN Line Malfunction," the issue may be deeper.

RFC codes are extremely sensitive to resistance changes. A slightly corroded bulb base can trigger a fault even if the light appears to be working. Clean the contacts with electrical cleaner. 2. Inspect the Chassis Ground

Reverse light circuit fault. Common in trucks used in muddy or construction environments where sensors get coated in debris.

While lighting faults are easy to DIY, errors related to the or Internal Module Memory require an Iveco EASY (Electronic Advanced System) diagnostic tool. If the truck is stuck in a "Limp Mode" or the air bags refuse to inflate, professional calibration is necessary to ensure road safety. To help you narrow this down, could you tell me: The specific code number showing on your display?

Check the wiring harness where it passes over the rear axles. Vibration often causes the insulation to rub through, grounding out the signal wires.

ECAS pressure sensor errors. These are critical as they can affect the truck’s stability and load distribution.