Safe to driveDrivable, but watch it yourself
J1939 code SPN 2023. Below — how the fault is worded at the factory by International and Mercedes-Benz, and what the second half of the code (FMI) means in the standard.
| FMI 3 | Gauge Cluster — Fault on Analog Input 4 above normal when used for ambient light |
| FMI 4 | Gauge Cluster — Fault on Analog Input 4 below when used for ambient light |
| FMI 6 | Gauge Cluster — Short detected in the panel dimmer |
| FMI 9 | Gauge Cluster — EGC Data Link Comm. Failure |
| FMI 11 | Gauge Cluster — Message ignition and switched ignition do not match. |
| FMI 12 | Gauge Cluster — Failure of non‐ volatile memory or checksum fault |
| FMI 14 | Gauge Cluster — Gauge Cluster (address 23), lost communication with ESC.; Gauge Cluster — Gauge Cluster (address 23), lost communication with engine controller.; Gauge Cluster — Gauge Cluster (address 23). ABS warning light malfunction.; Gauge Cluster — Gauge Cluster (address 23). Trailer ABS (Bus Lift Gate) warning light malfunction.; Gauge Cluster — Gauge Cluster (address 23). Datalink ignition signal does not match the hardwired ignition signal.; Gauge Cluster — Gauge Cluster (address 23) gauge location 1, data out of range high. and other gauge locations |
| FMI 9 | J1939 Message is missing from source address 23 (23dec = Instrument Cluster ECU missing) |
Safe to drive. Below — how much time you have and what happens if you keep going.
This is an electrical fault: an open, a short or a bad contact in the sensor circuit. The value it measures is most likely fine.
You can drive. But until the circuit is repaired this system runs blind and cannot warn you about a real failure.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.