Passat (B5) :: Auto Trans Keep Downshifting From 5th To 4th While Going 65 - 70 Mph
May 24, 2007
I was driving to work this morning on the highway and noticed my car was running at 3500 RPMs while I'm going 65... kind of odd, right? drop it into tiptronic, shows fourth, I shift up to 5th, and drop it back into "drive." A few seconds later I laid off the accelerator as the road started going downhill, and the car downshifted to 4th while I'm going 65... Back to tiptronic, shift up to 5th again, then shift back over to Drive.
I then accelerated a little as the road started going up hill, and the car downshifted AGAIN for no reason while I'm doing 70!!!! I wasn't laying on it at all either, very grandpa-like driving.... I've never driven an automatic car before, so maybe this is normal - but it doesn't seem normal. Once I got off the highway the car drove fine, but i dunno whats up. It's a v6 with 107k on it....
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My 07 AT 2.0 has a weird problem - when auto downshifting after a long drive at highways speeds, the whole car thuds. This happens after driving about 20 miles or so at 60MPH+. 5 or 10 miles are not a problem.
What happens is that when it slips down into 2nd, it sounds like something jams (no grinding). The force/feeling is similar to running into something at a slow speed - like bumping a car while parking.
If I slip into Tip and downshift manually, it doesn't happen. Outside of this the car has 22K miles and drives great.
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I was driving around some very steep hilly highways recently. I have tried this in both cruise control and normal coasting.
I noticed that the Tiguan will automatically downshift when going down a steep enough incline and a certain higher speed is automatically reached. Whether that is based on what was set by your cruise control, or even when letting the car coast down by releasing the gas peddle, it will still reach a point of downshifting automatically.
What I hate about it though is that this downshifting causes the engine to suddenly rev very high RPMs. Its also pretty loud at that point. That's bad for the transmission system right?
Usually in automatic mode driving, gear shifts up at around 2,500 RPM (mostly around 2000 RPM point). But when you are going downhill in a steep incline, the Tiguan automatically goes to a lower gear causing the RPM to shoot right up. I've had mine go up to 4,000 RPM downhill and the engine screams and spins really fast as you can clearly hear. It of course does the job of keeping the car at a certain speed, but is this bad for the transmission?
I mean, I prefer pressing on the breaks to control speed downhill. Break pads are cheap and easily replaceable. Transmission strain and failure is a whole other business. So I would prefer the strain be placed on my breaks and not my transmission system for the purposes of controlling speeds downhill. The latter failure mode will be the case if they rely on the transmission to control speed downhill.
So what is a "happy RPM" for the engine anyway? What RPM is the 2.0T engine at its most efficient?
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While getting onto the highway yesterday I was in D (not + -) and I was probably in 4th gear and hit the gas pedal maybe 60-70% down and my rpms shot straight to 6-7k but I didn't get any acceleration. I let the rpms drop and it drove fine after. Pretty sure I was smelling burnt clutch too (kind of unfamiliar with that scent, I've never slipped a clutch before).
I should probably take it to the dealer for them to look at it, but am worried it will be a 1-2 week thing and I'm not sure if I'd get a loaner.
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