Safe to driveTo the nearest safe stop
J1939 code SPN 4049. Below — how the fault is worded at the factory by International, Knorr-Bremse EBS and MAN, and what the second half of the code (FMI) means in the standard.
InternationalKnorr-Bremse EBSMAN
| FMI 5 | Transfer Case Rear Driveline Actuator — Transfer Case Rear Driveline Relay Under Current Or Open Circuit |
| FMI 6 | Transfer Case Rear Driveline Actuator — Transfer Case Rear Driveline Relay Over Current |
| FMI 8 | Central control unit, EEPROM checksum error own test. Wrong signal |
| FMI 8 | Central control unit EEPROM own test - Wrong signal |
| SPN 4049 FMI 54049/5 · 4049.5 | current below normal or open circuit |
| SPN 4049 FMI 64049/6 · 4049.6 | current above normal or grounded circuit |
| SPN 4049 FMI 84049/8 · 4049.8 | abnormal frequency or pulse width |
Safe to drive. Below — how much time you have and what happens if you keep going.
The gearbox or clutch has gone into limp mode: some gears may be unavailable and an automated box may stop shifting under load.
The main risk is being left on a climb with no gear and rolling back. Do not take a loaded truck into the hills; reaching level ground and a shop is fine.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.