HELP PLZ!!! TIPTRONIC ISSUES

[999]

Hi i have a 2000 986 boxster and about 2 months ago i was driving when the abs light came on and speedometer went out, I ordered a new wheel speed sensor when I realized the connector housing where the speed sensor plugs into was crumbling, so i returned the speed sensor and i guess when inspecting the connector housing it crumbled even more enough to where it was now giving the tip no speed signal so when in gear it would barely move even at high rpms (tip limp mode) so i got that replaced, reset the battery and it was driving great, then about a day later i got greedy and went to get the muffler deleted, dropped it off at the exhaust shop and when i went to pick it up it sounded great but was driving sluggishly and by the time i made it to the exit of the parking lot the shop is at it started doing the flashing d 4 limp mode, so i turned around and restarted it, still sluggish and then d4 came on  again so i reset the battery since i heard welding with the battery connected still (which i think he did) can cause arc flashes through the chassis, messing up the signal to the transmission until you reset the transmission. Long story short that did not do the trick it only made it worse, now its back to how it was originally when i had the abs wire harness issue (barely moves even at high rpms (also tip limp mode)) i looked under the car but didnt notice any cut or melted wires/ ground straps, but will look again. I think him welding with the battery connected still originally caused it to mess with the transmissions values and disconnecting and reconnecting the battery only further reset the transmission values/adaptations but im not really sure what my next step is, im in vegas and the mechanics out here are insanely expensive and I usually end up having to diagnose the issue myself via the forums or google anyways so i'd like to figure this out without having to call a mechanic or at least if I do I'd greatly appriciate if anyone knows an honest mechanic who is well versed in porsche systems, thanks in advance for the help.

[Loren]

You can not reset the transmission (or DME) after a current spike to the electrical system - at least not reliably.

You will need a PIWIS (or older PST2) to review the faults and to re-program both the transmission and DME. Any good Porsche repair shop should have both.

After re-programming they can check for any other damage or faults. If one speed sensor is crumbing I suspect the others are likely on their way out too.

 

[999]

10 minutes ago, Loren said:

You can not reset the transmission (or DME) after a current spike to the electrical system - at least not reliably.

You will need a PIWIS (or older PST2) to review the faults and to re-program both the transmission and DME. Any good Porsche repair shop should have both.

After re-programming they can check for any other damage or faults. If one speed sensor is crumbing I suspect the others are likely on their way out too.

 

hi loren thanks for the reply, i think i neglected to mention but i do have one code for p0717 with that being said with everything you've read do you think this is just a simple issue that has to do with the current spike and can be fixed with software? my main concern is that i will take it to a shop and they will try to get over on me, im a younger guy and ive owned a fair share of euro cars now and every time i go to a shop they always try to pull some sort of scheme which is why i try to work on my own stuff when i can, but this is something out of my league as of right now... how much should i expect to pay for something like that? id just really hate to get it towed to a shop and pay like $225 diag fee and they just give a basic lame diagnosis of it needing a new transmission, when i know it doesn't. thats kinda what happened the first time i called out 3 different people before i had learned that the connector housing being at all damaged can cause the same issue im dealing with now (limp mode), they all charged me for diag and acted like i was crazy for thinking the fix was gonna be anything but the transmission itself until i got the new harness installed and it was back to working flawlessly.

[Loren]

P0717 (Porsche codes 91 and 92) - 
Stall speed, transmission input - signal implausible
Gear monitoring, transmission input speed - signal implausible

 

Possible causes:

- Open circuit

- Short circuit to B+

- Short circuit to ground

- ATF level not OK

- Slipping clutch or brakes
- Faulty torque converter

 

Again further testing is needed (if this is a fault code) to narrow down the issue.

The obvious easy one is making sure the ATF level is correct. There is a procedure to measure the ATF level at a specific temperature in the service manual.

Here is the DIY procedure pretty much the same on a Boxster except the transmission faced the opposite direction)...

 

[999]

16 minutes ago, Loren said:

P0717 (Porsche codes 91 and 92) - 
Stall speed, transmission input - signal implausible
Gear monitoring, transmission input speed - signal implausible

 

Possible causes:

- Open circuit

- Short circuit to B+

- Short circuit to ground

- ATF level not OK

- Slipping clutch or brakes
- Faulty torque converter

 

Again further testing is needed (if this is a fault code) to narrow down the issue.

The obvious easy one is making sure the ATF level is correct. There is a procedure to measure the ATF level at a specific temperature in the service manual.

Here is the DIY procedure pretty much the same on a Boxster except the transmission faced the opposite direction)...

 

hmmm ok before i check that (or have it checked seems like something that could turn into a big job if i mess something up lol) do you think this has to do with the muffler delete the shop did?as mentioned its never had any issues with the tip and always shifted smooth as butter, only issue its ever had like this was the prior issue with the crumbling abs harness i had talked about where it was doing the exact same thing its doing now until i had a new harness installed and the battery reset, then it started working perfectly again, til the muffler delete and i know theres a few ground wires and the transmission connector near the muffler so maybe something got tugged or damaged during the work?