legendrx7

A while back my transmission started shifting weirdly and occasionally making the clanking noise while shifting. The PRND lights would all light up on the dash display too. I must say that I was nervous at first, thinking that I was going to have to replace the transmission. This started at the beginning of a 700 mile trip but it made it back home ok.

I did some searching and reading on the different Cayenne forums and found out that more than likely I was going to have to change out the valve body or transmission computer. I decided to first try a fluid change and ordered some fluid I had read about. Anyway, before I changed out the fluid, I went ahead and pulled codes with my Durametric and found several. Engine codes were B3901 - Evap Sys incorrect purge flow, B3D08 - System at Idle Bank 2, P1909 Air Leak between MAF and Throttle Body. Transmission had 1 code and it was 1314 - DME control module

I cleared the codes but they all came back as well as the transmission issues still happening. I looked through the engine compartment for any loose connections in the piping and hoses and ultimately found a cracked hose that runs across the top of the engine near the throttle body. The hose is thin plastic and is corrugated (looks like large diameter wire loom). So, I replaced the cracked hose with a rubber one I found in my garage. I cleared the codes again and took it for a drive. It drove perfectly and has since While I still have the CEL lit for the purge flow issue, it does not cause any driveability issues. I didn't even bother with the fluid change, I'll save it for later.

I did find another thread where a guy was having these transmission issues including the PRND and he said his was all fixed by changing out one of the emissions valves that the airpumps feed into. So, my point is that other issues outside of the transmission may be causing the transmission computer to do weird things to the shifting. Hope this helps someone in the future.
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04 CTT, silver, 20" Victor Equip Zehn Matte Black, custom 2nd cat delete pipes, Dynomax VT mufflers, lowered with Durametric
93 RX7, widebody, porsche arctic silver, single turbo++++++
93 RX7, wifes toy, streetported with stock twin turbos, tuned ecu++, 18" Work VSXX
93 RX7, electric car project, Warp 11HV, Soliton 1

cordsig79

Holy Schnikeys..............any chance you can take a picture???

I will follow up with my investigation as I am pending his repair and would love to avoid 800-1500 dollar spend.

cordsig79

OK you were right.... Having the plastic pipe replaced and throttle body cleaned for few hundred bucks instead of 2400 dealer recommended.

cordsig79

Pipe replaced

fluellen

So... did replacing that pipe affect the shifting, cordsig?

Thanks...

cordsig79

I had the corrugated pipe replaced (it was cracked) and the throttle body cleaned....it has stopped slippage by 85%. Still does it cold but its much softer and once warm the car pulls hard and strong up to accleration speed goal with full RPMs.

It does do a wee bit on some automatic down shifts but again not as severe.

So yes start there because its 300 bucks.....then decide if you need the replacement solenoid for 800.....then find a local shop to do the labor.

P dealer wanted 2300..

T1MWV

Hi All,

I have the same code 1314 coming up on the system tester 2 and also the dash will display PRND all lit us at once with a gearbox that sounds quite agitated, swapping up and down. You have replaced the corrugated pipe but its not on the Turbo engine. Has anyone replaced the pipe on a Turbo that can tell me where it is please.

Thanks in advance


Tim

khowell

Any luck on this?

hahnmgh63

Start looking at all of the plastic Vacuum / PVC pipes on the engine. The all get very hard and brittle and any jostling around (changing coil packs/plugs, air filters, etc....) can cause them to crack. Especially the ones around the throttle body and the ones running down both sides of the intake manifold. Also in the back of the engine (with the rear plastic cover off) there is a White Plastic Tee that is also prone to breakage as well as the plastic vacuum lines going from the vacuum pump (on the right by the Coolant tank (seen with the right side plastic cover off)) and going all the way across the back of the engine towards the master cylinder (left hand drive).

mcbit

Mine was a turbo and the problem revolved around the hose and valve connected to the secondary air pump.

haverland1975

Hello, I have issues with my gearbox on Cayenne S 2004. When I start it up cold, it always starts at first gear, nothing wrong here, but when I accelerate and it turns to second gear, it does it with a twitch, not softly. What's wrong? Gearbox about to give up? When switching gears from 2-6 nothing is wrong.

phatz

Haver
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