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Tiptronic Shifter wont engage Parking "P"

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Hi all,

I need your help. I just got a 1999 Boxster Tiptronic.

The gear selector(shifter) moves to possition "P" but it does not accually moves the gear to possition "P".

When I move it to "P" the Reverse "R" light flashes in the cluster, and the "P" light never lights up.

I have to put the shifter to neutral "N" to start the car.

Also the Shifter feels a little hard to move.

Any ideas of how to solve this problem?

Thank you in advance.

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I'm no Tippy expert, but you did ask for ideas. I recently installed and engine and transmission in my car, so I'm at least familiar with the setup. If you're lucky, it's just a matter of cable adjustment. :)

First thing to do is isolate where the problem is. The shifter cable connects to the left rear of the transmission to a bellcrank which operates a 10" rod ("deflector lever") that is connected to the transmission gear selector lever. From under the car, you can see where the shifter cable mounts to a bracket on the side of the transmission, so make sure the retainer clip is holding the cable firmly in place. When you pull back on the shifter in the cockpit, the cable moves the bellcrank in the opposite direction - so the rod moves forward toward the front of the car. When the shifter and transmission are in P, you're supposed to be able to easily slide the cable mounting head on top of the bellcrank without any tension. That is easier said than done, as my cable was firmly mounted and very difficult to pull off of the belcrank stud. Alternatively, find where the shifter rod attaches to the gear selector lever and pry off the rod from the ball socket. I found a long pry bar worked well for this. Once the rod is disconnected, pull the gear select lever on the transmission all the way rearward into P and see if the ball socket on the rod is lines up perfectly with the ball stud on the select lever (assuming the shifter in the cockpit is in P). If it doesn't, then you either need to make an adjustment of the cable end at the bellcrank (you can see the adjustment nut) or find another cause.

If the selector lever on the transmission will not go into P, then you have a more serious problem. You can easily move the selector around the different gears and monitor position by the LED in the cluster. Hope it's just a cable problem or adjustment issue.

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  • 7 months later...
I also have the same problem and symptoms and would like to know what causes it. Malfunctioning inhibitor switch potentially?

There are too many possibilities to have a single answer. The cockpit shifter moves the cable which operates a bellcrank with a rod attached and in turn operates the transmission shift lever. The tiptronic multi-function switch is bolted to the port side of the transmission and operated by the same transmission shift lever. So here are most possibilities:

Cockpit shifter or cable binding or damaged

Shifter cable kinked or binding or loose between cockpit and rear of transmission

Bellcrank binding or lack of lubrication

Adjustment of rod between bellcrank and transmission shift lever

Transmission shift lever damaged

Multi-function switch binding or damaged

Shift lever rod binding in transmission case

Interference where shift lever rod enters valve body

If you're moving the cockpit shifter into P but the dash indicator still shows R and the car won't start, it's very likely the fix is in the shifter mechanism at one of the areas on the list above. It's mechanical, and something is preventing the cable from moving the transmission shift lever from fully moving into P on the transmission. It's going to be a missing cable clip, an adjustment, or damage external to the transmission. Follow the procedure earlier in this thread.

I installed a very low mile transmission in my car that had been in storage for 5 year. As the transmission would heat up, the cable became very hard to move. I'd go for a test drive and barely be able to move the lever from D to P - and I'm a big guy. The mechanisms and cable checked out okay. Luckily, I have access to the NA remanufacturing center for these transmissions and I showed up to talk with one of their experts. He figured it was likely a binding between the internal shifter rod where it is supposed to actuate the valve body, and recommended loosening the valve body and retightening the bolts. Before I could get around to doing the job, the problem miraculously disappeared! I'm guessing the years of storaged caused a buildup of goop around the shift rod, or somewhere else, and just driving the thing got things working again. That was last fall and everything works as new and there are no leaks. Rarely do problems fix themselves, but I'm thrilled to have dodged a bullet on this one.

Good luck!

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Thanks for the advice! Solved this by adjusting the rod from the cable to the bellcrank:

1. Removed the rod's end from the bellcrank

2. Loosened the securing nut

3. Made the rod one round longer

Also lubricated all parts, now it's much smoother to move the shift lever.

The only minor issue remaining is that there's maybe ~1mm of slack in the cable / rod, which was the original reason for my problem. Now after the adjustment, it still sometimes blinks the R if lever is moved to P too slowly. The same sometimes now happens with D, only if I move the shift lever too carefully.

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  • 7 years later...

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