The database covers 163 dealer codes — Allison uses its own factory format, outside the J1939 SPN/FMI standard. A few examples below; look up your own code in the search on the homepage, where you can also pick “Allison” from the brand list.
| C1312 | Retarder engage request — signal voltage low. Retarder disabled. |
| P0610 | Vehicle options hardware error. Calibration data from the TCM ID module (TID) is used. |
| P0703 | Brake switch signal problem. On refuse trucks, N-D range shifting is blocked; if the code is active, retarder operation is disabled. |
| P0717 | No turbine speed sensor signal. Diagnostics run, transmission locked in current gear. |
| P0733 | Incorrect gear ratio in 3rd gear. Diagnostics run, transmission tries 4th, then 6th. |
| P0776 | Fault in the PCS2 solenoid hydraulic circuit. Diagnostics run, limp-home (RPR) active. |
| P0847 | Pressure sensor PS2 — signal voltage low. |
| P0962 | Pressure control solenoid circuit — voltage low. Diagnostics run, solenoids off, hydraulic control active. |
| P0975 | Solenoid SS2 — open circuit. On the 7-speed transmission, 1-7 and reverse-1 shifts are disabled. |
| P1714 | Transmission pressure switch reverse circuit stuck on Check Trans light on. |
| P1779 | Engine torque delivered to ECM Check Trans light on. |
| P2670 | Circuit HSD2 — voltage low. Diagnostics run, solenoids off, hydraulic control active. |
| P2724 | Fault in the PCS1 solenoid hydraulic circuit. Diagnostics run, limp-home (RPR) active. |
| P2763 | Torque converter lock-up solenoid circuit — voltage low. Torque converter lock-up inhibited. |
| U0010 | CAN bus (IESCAN) counter overflow. Default values used, torque management during shifts disabled. |
Know the code number? Type it into the search — or paste the whole list from the scanner and we will show which fault is the real one.