tiptronic gearbox flashing d light

[cbr786]

hi any help would be appreciated I aquired a 996 C4S Convertible and it has a transmission problem. when cold it drives fine for say about ten miles but the D led is flashing on the dash display along with the 4rth gear led they alternate in flashing as the car is driven. eventually the car gives symptoms of clutch slipping reving but no movement obvoisly their is no clutch as it is tiptronic the car is 1999 3.4 C4S cab any help would be good do you think car is low on gear oil ?

Cel light came on AA came out read the fault as gear 3 and 4 ratios incorrect what does this mean ? in laymans terms :)

[Loren]

:welcome:

There was no C4S in MY1999 (C4S started in MY02) - so perhaps your car is a C4?

What are your fault code(s)?

[cbr786]

:welcome:

There was no C4S in MY1999 (C4S started in MY02) - so perhaps your car is a C4?

What are your fault code(s)?

hi thanks for the welcome strange when HPI the car it comes up as a 1999 C4 tiptronic S hence I assumed it was a C4S ? it is a convertible any way I dont know the fault code because the breakdown man did not tell me them all he told me was his computer when hooked up said "incorrect gear ratio 3 and 4" and symptoms are car loosing drive as if it had a clutch and it was slipping car revs perfectly but will not move when this problem occurs and since cel light was cleared by breakdown man by clearin the error code the car still hasthe same problem but no cel light comes on any more ???

I know the cel light is working because it comes on when ignition is switched on then goes out like it should.

/i think some one must have drained the gear oil as i dont know the history on the car came from auction ..

guess that what happens when you try to get a cheap 996 in the UK.. :D

[Richard Hamilton]

Your tiptronic control module has gone into the Limited Driving Program due to an electrical or electronic fault. You need to get a diagnostic check done by an OPC or specialist to see what fault codes are stored.

Edit: BTW, it's safe to continue driving.

Edited May 26, 2008 by Richard Hamilton

[cbr786]

Your tiptronic control module has gone into the Limited Driving Program due to an electrical or electronic fault. You need to get a diagnostic check done by an OPC or specialist to see what fault codes are stored.

Edit: BTW, it's safe to continue driving.

Thanks for the info much appreciated dunno about keep driving as the car refuses to move after 10 miles just revs like thier is no clutch etc and no cel light comes on strange i assumed it should always come on when a fault is detected ?? will contact a after market porsche specialist tue will let everyone know what happens ..

hopefully it wont cost too much and my gearbox is okay

[salayc]

FYI, Vertex auto has rebuilt tips for $2900 (if you find you need one)

For others: is the '99 tip direct drive gears 3-5?

[Richard Hamilton]

Thanks for the info much appreciated dunno about keep driving as the car refuses to move after 10 miles just revs like thier is no clutch etc and no cel light comes on strange i assumed it should always come on when a fault is detected ?? will contact a after market porsche specialist tue will let everyone know what happens ..

hopefully it wont cost too much and my gearbox is okay

I didn't realise that the transmission loses drive completely - that doesn't sound good. The CEL wouldn't come on with a transmission fault anyway - only engine faults.

Where are you located?

[cbr786]

Thanks for the info much appreciated dunno about keep driving as the car refuses to move after 10 miles just revs like thier is no clutch etc and no cel light comes on strange i assumed it should always come on when a fault is detected ?? will contact a after market porsche specialist tue will let everyone know what happens ..

hopefully it wont cost too much and my gearbox is okay

I didn't realise that the transmission loses drive completely - that doesn't sound good. The CEL wouldn't come on with a transmission fault anyway - only engine faults.

Where are you located?

i am in birmingham the tranny losses drive and the car just revs out and tries to move slowly like the clutch has burnt out is thier any way checking gear oil level via dipstick or window etc ?

gonna get it looked at on friday 30th may see what happens just wanted to make sure i dont get ripped off etc

[Richard Hamilton]

There isn't an easy way to check the fluid level. You have to get the car up to operating temperature, get it in the air (engine running), remove the filler plug, and fill until it overflows.

I don't know where you plan to take it, but PCT in Coventry are very good (on the Autobahn site on the A45).

[RFM]

ATF level check at 40° C. max. Tiptronic oil temperature !!!

[Richard Hamilton]

Yes - sorry - I was trying to keep it simple. To be precise:

Testing conditions:

— The transmission must not be in the reduced driving program.

— The ATF temperature must be between 30 C and 45 C. An ATC inspection at an insufficient ATF temperature causes over-filling and an inspection at an excessive ATF temperature causes insufficient filling

— Selector lever in position "P" and engine idling.

— The air-conditioning system and the heater must be switched off.

— The vehicle must be standing horizontally.

[juniinc]

TIP ATF fluid check isn't too easy,,,40C MAX!!!

U will need a Temperature meter with probe inserted into the hole .

[Richard Hamilton]

You can use a PST2/PIWIS to read out the transmission temperature.

Edited May 27, 2008 by Richard Hamilton

[cbr786]

:( drove car again today round the block just to see if fault still there and yep car starts fine idles okay even get water coming out drop at a time from exaust

any way drove car round block 3 times third time the car started slipping by slipping i mean when you press the throttle the car revs up accordingly but no drive anyway a engine light has come on now so will call out local guy tommoz to give me some proper error codes and will let evryone know what they are

some one suggested a switch on the gearbox could be faulty ??

[cbr786]

:( drove car again today round the block just to see if fault still there and yep car starts fine idles okay even get water coming out drop at a time from exaust

any way drove car round block 3 times third time the car started slipping by slipping i mean when you press the throttle the car revs up accordingly but no drive anyway a engine light has come on now so will call out local guy tommoz to give me some proper error codes and will let evryone know what they are

some one suggested a switch on the gearbox could be faulty ??

forgot to mention when car looses drive if i switch car off and on again hey presto drive comes back along with the cel

[salayc]

:( drove car again today round the block just to see if fault still there and yep car starts fine idles okay even get water coming out drop at a time from exaust

any way drove car round block 3 times third time the car started slipping by slipping i mean when you press the throttle the car revs up accordingly but no drive anyway a engine light has come on now so will call out local guy tommoz to give me some proper error codes and will let evryone know what they are

some one suggested a switch on the gearbox could be faulty ??

forgot to mention when car looses drive if i switch car off and on again hey presto drive comes back along with the cel

In gears 1-2 you are using the torque converter which is a fluid coupling. If your fluid is low, the torque converter will slip.

In 3-5 I believe you are in direct drive i.e. the torque converter is not used.

Shifting of an automatic transmission also requires vacuum which may explain your CEL.

[cbr786]

okay thanks for the advice found a fault code the only one that came up was P0734

the guy who read it said gear ratio 4rth gear incorrect ??

what does this mean ?

box low on oil ? (remember i got car in auction do not know history)

clutch plates on auto box?? some one said thier are 6 clutch plates in tip box ??? they could have worn down?? does this make sense

[Loren]

P0734 Gear monitoring, 4th gear - signal implausible

Potential causes:

- ATF level not OK.

- Mechanical/hydraulic fault in transmission.

- 34 (e.g. solenoid valve does not operate despite correct electrical triggering)

- Solenoid valves

- Valve chamber

- Transmission

[Izzy]

Sent you a pm with some info on it too.

[cbr786]

Sent you a pm with some info on it too.

THANKS FOR THE

car has been recovered to porsche independant specialist so we will see what happens

I told the independant that first drain the tranny oil and replace the filter and new fresh oil in the tip box and we will take it from thier

he replied if he starts draining the tranny oil and it comes out black means my box is scrap and will need a rebuild???

does that make sense ?

i will update when I get more info from him as to what is acyually wrong with my car

a big thankyou to evryone who has tried to help me out with advice much apprecieated.

[RFM]

The black colored oil is coming from the clutch disc friction material, which means there is ( was ) too much slip. Give it a try with fresh ATF and keep the tip. replacement for later on.

[Richard Hamilton]

I changed the ATF on mine a couple of months ago and was horrified by the colour - it was as black as your hat. I agree with RFM - try it with fresh fluid, and follow Loren's checklist, before thinking about changing the tranny.

[Izzy]

Nope, he may be trying to set up his next meal ticket. The full oil change is just over 9 liters, a drain and fill is about 6 (from memory). Ask him how much he used without telling him, and you will know if it was a full flush or not. If not, you may have to drain and fill aobut 3 times to get all the old stuff out. Again, that was my experience doing it myself. I drove about 100 miles between flush/refills. A dealer with PIWIS can do a full flush.

[cbr786]

thanks everyone for all your input the information is sooo useful it is good to know so I can be prepared lol the indpendant dealers some times view customers like meal tickets lol

I will tell him to put fresh recomended porsche gear oil in the tranny along with new filter and try the car out like that if it still plays up might need to drain it again as mentioned in previous posts

dont really want to fork out for replacement tranny especially since the current tranny apart from going in reduced driving program works fine no noises or other tantrums etc

the indpendant dealer said he has ordered filter inwont be with him until 2nd june and then he will do the work and see if it resolves the issue fingers crossed

and the sun has come out today usually it is raining

btw with out sounding stupid what is A dealer with PIWIS can do a full flush.??/ is that the computer ro read the temps in the box as the fluids going in ??

[Izzy]

A Porsche dealer has the computer that can connect the to the car and fully flush all the ATF, including the fluid in the transmission cooler. The drain will only drain the fluid in the pan, or roughly 2/3's of all the fluid.

If the independent can do a full flush, you probably want to observe how they do it. If all they do is raise the car, open the drain and flush, then you will still have old fluid in there that will mix with the new.

Did you see the this post on the service?:

http://www.renntech.org/forums/index.php?showtopic=6203