I brought it in for the tranny TSB, but the actual cause was the injectors so they really didn't misdiagnose anything. I'll be monitoring the fluid condition going forward. Interestingly, why such a frequent change interval if the software fix is supposed to help remedy this problem, IE proper cooling? I can understand 30K for people that tow, but otherwise..?If the "judder" went away after the injector replacement, then it wasn't torque converter judder as addressed by the TSBs. In order for Honda to reimburse the dealer for this repair, they have to record the judder using a snap shot and the graph has to indicate a specific type of judder.
What likely happened was the the dealer misdiagnosed your issue as torque converter judder and Honda wouldn't reimburse them for the flush so they passed the cost of their mistake on to you.
There is no 30,000-mile transmission fluid replacement interval - that's something made up by the dealer. The transmission fluid is supposed to be replaced when code 3 appears on the Maintenance Minder along with A1 or B1. On average, code 3 will appear for the first time at an oil change near 45,000 miles then ever 30,000 miles after that. The exact distance will vary depending on actual driving conditions since the vehicle calculates engine oil life and transmission fluid life based on actual driving conditions.