I've been dealing with a "no reverse" issue in my 2000 Passat's 01V transmission for almost one year now, and I'm still trying to narrow down the likelihood of the possible problems; given that the car is about 12 years old with 110K miles, I would like to avoid a major rebuild it possible.
Here are the symptoms, which have been very consistent since the problem first surfaced.
- On a cold start (no driving for several hours/over night), reverse will engage for a short period of time and then disengage. The car will shudder when moving into reverse gear, will move with throttle, then disengage shortly afterwards as if it were shifted into neutral. In this state, there is a small amount of constant drive force as the car will start to move in reverse from a full stop.
- On a warm start, reverse will never engage and no drive force is present.
- All forward gears engage and stay engaged as expected.
I performed a proper ATF fluid and filter change and noticed no unnatural debris (transmission parts) in the ATF pan during the process. Furthermore, scanning the TCM with a VAG-COM yielded no stored errors. I also used the VAG-COM to observe the motion of the N88 solenoid during shifting and it appears normal, though I didn't observe the pressure-control valves N91 and N93 (the manuals states these are the three valves that operate when in reverse); the multifunction-swtich also appears to be operating correctly as it doesn't slip when selecting reverse.
I've read about the d-drum issue with the ZF 5HP19 transmission (manufacturer labeling for the 01V transmission), but I don't think that is the problem since I can engage in reverse for a short period of time.
What could be the possible cause of this problem and what can I do to further diagnose the root cause? Has anyone else had a similar problem and resolved it?