This WTEC III DTC list is an 8-page reference brochure published by Allison Transmission covering diagnostic trouble codes, oil level check procedures, and prognostic features for WTEC III electronically controlled shift selectors used on 3000/4000 Series transmissions. It provides main codes, sub codes, and plain-language descriptions that mechanics need to interpret CHECK TRANS light warnings and shift selector display readouts.
Official WTEC III DTC list document details
| Brand | Allison Transmission |
| Model coverage | 3000/4000 Series Allison Transmissions |
| System / Group | WTEC III (3rd Generation) Electronic Controls / Shift Selectors |
| Publication no. | SA7297EN (2012/12) |
| Year / Revision | December 2012 |
| Pages | 8 |
| File size | 5.2 MB |
| Format | |
| Language | English |
Document table of contents
- General Information — The Allison Advantage
- Fluid Levels — Checking Fluid Levels procedure
- Oil Level Sensor fault codes (oL display, delayed fluid level check, fault code table)
- Diagnostic Codes — Entering, reading, and clearing codes via shift selector
- Diagnostic Transmission Codes table for WTEC III (3rd Generation) Shift Selectors — Main Code 11 through 70
- Mode Button operation (primary and secondary shift schedule modes)
Applicable truck models
This brochure applies to any vehicle equipped with an Allison 3000 or 4000 Series automatic transmission using the WTEC III electronic controls package and 3rd-generation shift selectors (pushbutton or lever style). Common applications include medium- and heavy-duty trucks, transit buses, refuse vehicles, and emergency apparatus. The Transmission Control Module (TCM) codes listed cover solenoid circuits (A through N), speed sensors, throttle position sensor faults, sump oil temperature sensor errors, retarder temperature and modulation sensor codes, ratio and pressure-switch tests, J1939 serial communication faults, ECU self-tests, and software loop overruns. For additional technical resources and operator’s manuals, visit Allison Transmission official site.
Who needs this WTEC III DTC list manual
Fleet mechanics, independent transmission shops, and workshop owners servicing Allison-equipped trucks will find this reference essential for quickly identifying fault codes displayed on the shift selector without requiring a laptop-based scan tool. It is also useful for drivers who need to perform a fluid level check or record active and inactive diagnostic codes before visiting an authorized service outlet.
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