3 Universal Heavy diagnostic codes on file. Each shows the symptom for free — unlock the full diagnosis, repair steps, and field insights with a free account.
| Code | System | Symptom | Fix |
|---|---|---|---|
| SPN 1638 FMI 0 | Hydraulics | Hydraulic Speed Slowdown / Maintenance Warning | Unlock |
| SPN 1638 FMI 0 | Hydraulics | Hydraulic Speed Slowdown / Maintenance Warning | Unlock |
| SPN 1638 FMI 0 | Hydraulics | Hydraulic Speed Slowdown / Maintenance Warning | Unlock |
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