The Iveco Stralis is a workhorse of the European logistics industry, known for its durability and efficiency. However, like any modern heavy-duty truck, it relies on a complex network of electronic control units (ECUs) to manage engine performance, emissions, and safety systems. One of the most critical—and often misunderstood—components of the Stralis is the RFC system (Regeneration Functional Control or, in some contexts, the proprietary Iveco chassis and engine management protocol).
Example: Fault code 4742 + 4747 active.
→ Additive dosing circuit malfunction (4742) leads to DPF efficiency low (4747).
→ Likely cause: Clogged dosing injector or dead pump.
→ Repair: Replace RFC dosing unit, reset counter, regen DPF.
: A faulty engine oil pressure sensor or air pressure sensor can trigger RFC errors. Connector Integrity iveco stralis rfc fault codes
| Fault Code | Description | Likely Cause | |------------|-------------|----------------| | 4741 | RFC – Additive level too low | Additive tank empty or level sensor failure | | 4742 | RFC – Additive dosing circuit malfunction | Clogged injector, pump failure, or blocked line | | 4743 | RFC – Additive pressure sensor fault | Faulty pressure sensor in dosing unit | | 4744 | RFC – Communication error between ECU and RFC controller | CAN bus interruption, wiring issue, or faulty RFC module | | 4745 | RFC – Additive quality error | Wrong or degraded additive (non-genuine fluid) | | 4746 | RFC – Additive temperature out of range | Sensor failure or heater malfunction (cold climates) | | 4747 | RFC – DPF efficiency low due to missing additive | Additive system disabled or empty for long period | | SPN 5394 / FMI 0-16 (J1939) | RFC Additive Tank Level – Low / Data erratic | Level sensor or wiring short |
0119 - Controller Voltage Loss: Loss of voltage (terminal 15) to the control module. Mastering Iveco Stralis RFC Fault Codes: A Comprehensive
⚠️ Important: Do not use non-approved additives. Wrong fluid will cause crystallization, injector blockage, and permanent damage to the RFC system.
To understand the "RFC fault code" is to understand the breakdown of the covenant between man and machine. EBS control unit (main brake computer) Trailer control
Many RFC errors are triggered by simple blown bulbs or using the wrong wattage. Check all trailer and rear tractor lights. Check Connectors: