The Allison Transmission Codes Manual provides a comprehensive guide to diagnostic trouble codes (DTCs) for Allison automatic transmissions. It includes error code definitions, troubleshooting steps, and repair recommendations, helping technicians and operators quickly identify and resolve transmission issues for optimal performance and reliability in commercial and heavy-duty vehicles. https://mechnician.com/blogs/news/a-review-of-the-allison-transmission-fault-codes-list-and-the-jaltest-code-reader