Safe to driveUntil the next service
SPN 520233 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by KAMAZ, MAZ, SITRAK, Volvo and YaMZ, and what the second half of the code (FMI) means.
| FMI 20 | Service signal: cylinder cutout test |
| FMI 20 | Cylinder cutout test in progress - Test in progress. Blink code: 5-3-5. |
| FMI 11 | ECU internal monitoring reported a fault, function monitoring level (MoF). Scan tool code: P101D. |
| FMI 12 | Wiring between the LCM and the switch shorted, or switch faulty. |
| FMI 20 | Cylinder cutout test in progress (Test running). Blink code: 5-3-5. |
| SPN 520233 FMI 11520233/11 · 520233.11 | root cause not known |
| SPN 520233 FMI 12520233/12 · 520233.12 | faulty device or component |
| SPN 520233 FMI 20520233/20 · 520233.20 | data drifted high |
Safe to drive. Below — how much time you have and what happens if you keep going.
A standalone fault with no immediate consequences for driving.
Show the codes at the next service. If a second code from the same system appears, stop putting it off.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.