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Incorrect or missing signal from the rear wheel speed sensor. Internal RFC Module Error
3. Low Fluid Level / Sensor Signals (e.g., RFC ... 11 12 13 )
Here are some common RFC fault codes associated with the Iveco Stralis:
Many veteran drivers and mechanics have compiled troubleshooting spreadsheets and PDFs. By consulting truck mechanic communities like the Iveco Support Forum, you can search for your exact code combination (like RFC 15 02 ) to find out exactly what other drivers did to resolve the problem. Troubleshooting Common RFC Fault Codes iveco stralis rfc fault codes free
Indicates a power supply issue to the RFC, often resulting in erratic electronic behavior.
: Several websites provide downloadable factory manuals at no cost. For electrical architecture, the "Electricidad Iveco Stralis" manual (available on idoc.pub) provides an excellent description of the multiplex system and the functions of the FFC and RFC ECUs. Another valuable resource is the "Iveco Stralis Código De Errores.pdf" , a 420-page document providing deep troubleshooting instructions for the Body Computer (BC) and instrument cluster, which is invaluable for cross-referencing general truck electronics.
: Related to the rear lighting or side direction lights. 1401 : Supply pressure sensor fault. Diagnostic Indicators (FMI Codes) Incorrect or missing signal from the rear wheel speed sensor
: RFC faults are frequently caused by corrosion on the ground points near the rear frame.
If you do not have access to paid diagnostic software, you can attempt a basic diagnosis using the dashboard display and physical inspection.
Electronically Controlled Air Suspension (ECAS) sensors and solenoids. Trailer connection sockets (7-pin / 15-pin ISO connectors). Axle load sensors and lift-axle controls. 11 12 13 ) Here are some common
Truck starts fine cold but after 1 hour highway, loses power. Code RFC 18 (rail pressure low during cranking – but engine isn't cranking!) Free diagnosis: The ECM erroneously logs cranking pressure faults while driving due to a failing crankshaft position sensor (CKP). Cleaned CKP and repositioned air gap – no new RFC codes for 6 months.
Check the main power fuses located in the primary cab fuse box (usually marked with an RFC or Chassis symbol). 2. Inspect the "Green Rot" Wiring Zones
| RFC Code | SPN | FMI | Meaning | Common Cause | |----------|-----|-----|---------|---------------| | | 157 | 1 | Rail pressure too low | Clogged fuel filter, suction valve stuck closed | | RFC 2 | 157 | 0 | Rail pressure too high | Return line restriction, pressure relief valve failed | | RFC 13 | 1645 | 0 | Fuel metering unit current too high | Short to ground in suction valve wiring | | RFC 14 | 1645 | 1 | Fuel metering unit current too low | Open circuit, broken wire to suction valve | | RFC 18 | 157 | 18 | Rail pressure below minimum during cranking | Empty fuel tank, air in system, failed lift pump | | RFC 27 | 1645 | 7 | Mechanical failure of metering unit | Internal wear, debris in fuel | | RFC 32 | 1569 | 3 | RFC – Soak pressure drop | Leaking injector, internal pump leak | | RFC 41 | 157 | 15 | Rail pressure deviation – positive | Suction valve stuck open, pump oversupply | | RFC 42 | 157 | 16 | Rail pressure deviation – negative | Weak pump, restricted suction valve | | RFC 77 | 1645 | 12 | Fuel metering unit calibration error | After replacement, unit not learned | | RFC 93 | 157 | 31 | Emergency RFC limit active | Severe pressure mismatch – immediate limp mode |
Iveco Stralis RFC fault codes are an essential tool for diagnosing and troubleshooting issues with the vehicle's systems. While there are commercial resources available, free resources like the Iveco official website, online forums, and PDF manuals can provide valuable information. By understanding the causes and solutions for common fault codes, technicians and owners can efficiently diagnose and repair issues, reducing downtime and increasing vehicle performance.