My 2018 Ram 3500 Cummins 6.7 with an Aisin transmission intermittently enters a “4th gear only” limp mode when towing heavy loads in hot weather. The dealer previously diagnosed and repaired the issue using diagnostic trouble codes (DTCs) read upon arrival, while the truck was still exhibiting symptoms. Unfortunately, the problem persists, although now a simple restart, rather than a 30-minute cooldown, seems to temporarily resolve the issue. I need a reliable 2018 Ram Cummins Scan Tool capable of live data scanning to provide comprehensive diagnostic information for the dealer’s next attempt at repair.
The ideal scan tool must have full code access for all 2018 Ram systems, including the Cummins 6.7 engine and Aisin transmission. Crucially, it needs live scanning capabilities, freeze frame data capture, and bi-directional controls. My research has been challenging due to the lack of clear information regarding tool compatibility with my 4th generation diesel Ram. While the Foxwell MD808 Pro appears potentially suitable, confirming its capabilities for the Aisin transmission has been difficult, even on the manufacturer’s website. Other brands like Autel also seem promising.
I’m seeking recommendations from those with firsthand experience using a 2018 Ram Cummins scan tool for Aisin transmission diagnostics. Specific details about the tool’s functionality and confirmed compatibility are essential. Previous discussions regarding this issue can be found here: https://www.turbodieselregister.com/threads/aisin-limp-home-symptom-under-load-in-hot-weather.270228/. While insightful advice has been received, the relative rarity of this specific Aisin problem limits comprehensive diagnostic knowledge.
Therefore, finding a dependable scan tool compatible with both the Cummins 6.7 and Aisin transmission, capable of diagnosing engine and transmission codes and live data, is paramount. Cost is a secondary concern, as a reliable tool for resolving this and future issues is a worthwhile investment. A tool priced in the hundreds of dollars is acceptable if it meets these requirements.
Ultimately, the goal is to accurately diagnose the root cause of the intermittent limp mode using a capable 2018 Ram Cummins scan tool. Live data analysis, freeze frame data, and comprehensive DTC access are vital for effective troubleshooting. The ability to perform bi-directional controls would be a significant advantage. Recommendations for specific scan tools known to work effectively with the 2018 Ram 3500 Cummins 6.7 and Aisin transmission are greatly appreciated.
