Iveco Stralis Rfc Fault Codes Free Patched Jun 2026

| Fault Code (DTC) & FMI | Description of Fault | Most Common Causes & Solutions | | :--- | :--- | :--- | | | Air pressure sensor on the Air Processing Unit defective or open circuit. | * Cause : Faulty air pressure sensor or broken wires; sensor often fails due to excessive air pressure. The air unit may not release the overpressure. * Fix : Locate the Air Processing Unit (Air Dryer) in the middle of the chassis on the left-hand side (UK passenger side). It is identified by a large filter cartridge. The sensor is on top with a round connector. Check the connector for corrosion. Test or replace the sensor itself. | | 16 / FMI 05 | Short circuit or open circuit on trailer tail light circuit. | * Cause : Short circuit or high resistance/open circuit on the trailer's tail light circuit; often caused by damaged cabling in the trailer plug or a defective/faulty bulb in the trailer. * Fix : Visually inspect the trailer’s lighting plug and socket for damage or corrosion. Check all tail lights on the trailer for proper operation. Replace any faulty bulbs or repair damaged wiring. | | 18 / FMI 05 | Short circuit or open circuit on trailer right turn signal circuit. | * Cause : Open circuit or short to ground on the power supply for the trailer’s right turn signal. This is usually a wiring or bulb issue on the trailer side. * Fix : Inspect the trailer’s right turn signal bulb; ensure it is of the correct wattage (typically 21W). Check the trailer's cabling and the main connector for damage, corrosion, or a poor ground connection. | | 1A / FMI 05 | Number plate light circuit: open circuit. | * Cause : An open circuit in the power supply to the number plate lamp(s). * Fix : Check that the number plate light bulb(s) are working and are the correct wattage (typically 10W). If the bulb is good, inspect the wiring to the light unit for damage, corrosion, or a poor connection. | | 1B / FMI 05 | Rear right-hand position light (tail light) circuit: open circuit. | * Cause : An open circuit or high resistance in the rear right tail light. * Fix : Inspect the rear right tail light. This is often a simple fix of replacing a blown bulb (typically 5W/24V) or cleaning a corroded bulb holder. Ensure the bulb is of the correct wattage. | | 1E / FMI 12 | Tail clearance light circuit: current too low or value too high (undercurrent). | * Cause : This is often an undercurrent, meaning a bulb with incorrect (lower) wattage is installed, or a bulb has failed. * Fix : Check all marker lights along the side and rear of the tractor. Replace any dim or non-functional bulbs. Verify all bulbs are of the correct, manufacturer-recommended wattage. | | 1F / FMI 12 | Left-hand parking light circuit: short circuit. | * Cause : A short circuit in the left-hand clearance/parking light wiring. * Fix : Inspect the wiring harness, particularly where it may rub against the chassis or be exposed to moisture. Look for frayed wires or damaged insulation. Check the bulb holders for internal short circuits. | | 1D / FMI 05 | General short circuit or open circuit on one or more rear lighting circuits. | * Cause : A non-specific electrical fault in the rear lighting system. * Fix : Since the code is generic, the solution is to perform a systematic visual inspection of every single light at the rear of the truck (tail, stop, turn, reverse, marker, and number plate). Check all bulbs, their holders, and the visible wiring for damage. Often, this will lead you to a single failed bulb. | | 01 / FMI 06 | Overload or short circuit on an auxiliary output of the RFC, often the connector for rear bodywork/equipment. | * Cause : A connected accessory or body on the rear of the truck is drawing too much current, or there is a short circuit in its wiring. * Fix * : Disconnect any aftermarket or auxiliary rear equipment connected to the vehicle’s wiring. Check for chafed wires in the added equipment's harness. If the fault disappears, the issue lies with the external accessory. | | 13 / FMI 05 | Trailer left side lighting circuit: open circuit. | * Cause : The left side lighting circuit for the trailer is incomplete. * Fix : Check the trailer’s left side lights (position, side marker) and the corresponding pins in the trailer connector. Inspect the trailer's main cable for wear. | | 18 / FMI 05 | Trailer right brake light circuit: not engaging. | * Cause : The right-hand stop light on the trailer is not functioning. * Fix : Have someone press the brake pedal while you check the trailer's right brake light. Inspect the bulb, the bulb holder, and the wiring for that specific light. |

Troubleshooting Iveco Stralis RFC Fault Codes: A Complete Diagnostic Guide

Current above normal or short circuit to ground (Look for pinched wires rubbing against the metal frame).

The screen will display the active fault codes. Write down the numbers exactly as they appear. Understanding the Code Structure iveco stralis rfc fault codes free

Many RFC errors are caused by simple bulb issues or sensor wiring damage due to their exposed location on the chassis. Typical Meaning Common Fix / Requirement Air Pressure Sensor (Front/Rear Axle)

Located on the side of the gearbox.

A yellow RFC light can also point to issues with the vehicle's air brake system, as the RFC monitors the pressure sensors on the air processing unit (APU). | Fault Code (DTC) & FMI | Description

When an RFC error pops up, understanding what it means without paying for expensive diagnostics is key to getting back on the road. This guide provides a free list of Iveco Stralis RFC fault codes, their meanings, and troubleshooting steps. What is the RFC in an Iveco Stralis?

By far, the most common cause of an RFC fault code is something simple: a burned-out light bulb or a corroded bulb holder. The RFC's primary job is to monitor the lighting circuits for correct current draw. If a bulb is missing, the wrong wattage, or has failed, the RFC will detect an "open circuit" or "incorrect value" and trigger the warning light.

| Fault Code / Reference | Likely Component | Description and Symptoms | | :--- | :--- | :--- | | | Splitter Solenoid Valve | Open circuit or short to ground. The ECU cannot energize the valve to switch ranges. Truck may get stuck in one gear range. | | P1741 / Code 21 | Range Position Sensor | Signal implausible. The sensor reports the gearbox is in High range when the ECU requested Low, or vice versa. | | P1730 | Transmission Actuator | Mechanical failure. The pneumatic actuator is stuck or leaking. You may hear hissing air from the gearbox area. | | P1725 | J-Gate / Selector Lever | Fault in the gear selector signal. The truck does not know if you want Drive, Neutral, or Reverse. | | P0730 | Incorrect Gear Ratio | A generic code often triggered when the splitter fails to engage, causing a slip or mismatch between engine RPM and wheel speed. | | EDC 615 | Clutch Position Sensor | Often linked to RFC faults because if the clutch doesn't open fully, the range change cannot occur. | | Code 43 | Pressure Switch | Low air pressure supply to the gearbox splitter unit. Check air tanks and dryer. | * Fix : Locate the Air Processing Unit

RFC faults are frequently triggered by the air pressure sensor (the "chocolate" sensor) located near the four-circuit valve. Clean the contacts if they are dirty.

Electrical supply and signals sent to the towed trailer.

Chafed insulation where the harness rubs against the metal frame. Corrosion inside the rear junction distribution box. Water accumulation inside the protective plastic conduit. Step 4: Perform a Hard Reset