5 Allison 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 |
|---|---|---|---|
| Code 24-12 | Transmission | Trans Locked in Neutral / Shift Inhibited | Unlock |
| P0700 | Transmission | Shift Inhibited | Unlock |
| SPN 191 FMI 9 | — | Trans Warning. | Unlock |
| SPN 191 FMI 9 | Transmission | Trans is in "Limp" (3rd Gear). | Unlock |
| SPN 523 FMI 7 | Transmission | Gear Mismatch / Neutral Lock. | Unlock |
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