29 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHTraction Control
Leading reported evidence
Check codes, hence the repost here
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Leading evidence: 'Check codes, hence the repost here' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check codes, hence the repost here' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
Did you change your gear oil and not add an additive?
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
It defaults to the on position, but if you want to run without it, then when you press it the button lights up.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
29 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T113718Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
99 C2 and it has limited slip and traction control. I think you have to look for the option codes 220 and 222 to see if you have them. I guess I lucked out because I didn't specifically look for it when I bought the car.
As far as I know....the early cars required special orders for the 220 and 222 option codes. My 99 has a rocker button on the dash that's labelled "TC". It defaults to the on position, but if you want to run without it, then when you press it the button lights up. I know that some of the guys would rather not have it, but my thinking is that if you have it you can always turn it off, but the reverse doesn't apply. There have been previous threads discussing the merits and demerits of having this option. All I can tell you is that it saved me from a potential wreck one time in a rainstorm. I remember seeing the traction control light up on the dash and the car straightened out. After that, I have deliberately tried to get it to light up by harsh maneuvers, but I couldn't get the car sideways....and truthfully, don't want to get too damn aggressive just to prove a point.
I'm not sure if Porsche even offers the 220 option without the 222....they seem to go hand in hand.
My car has 220 and 222. So I should think it has Limited Slip along with the TC. But when I have the back end of the car up, I turn my rear wheel one direction and the other side spins the opposite. Also, at Turn 2 at buttonwillow, I notice I spin the inside tire like crazy before my weight evens out and the outside grips more.
Is something wrong with the LSD? or does the LSD on my 996 work differently than on other cars? Maybe it doesn't have LSD after all?
No, the LSD option is a rare one. Only an available option on the 1999. It was not available again until the 2004 40th anniversary edition came out and it was standard on that car. All GT3 and GT2 have it, not sure about Turbos. It is a great feature to have it you are in to tracking the car.
correctomundo. Can you do a smokey burnout? They you don't have the traction control. It's a bit of a buzz kill. Whenever I get a wild hair to get the tail wagging, I have to have the fore thought to turn off the PSM in my '02.
If you are getting that spinning feeling on the one of the tires in a loaded turn and only one direction then I doubt that you have lsd. When I first felt it autoxing my 87 Carrera I thought that I lost my clutch.
LSD could be shot?
This is just what I have heard, but some people seem to think that most of the LSD systems out there on the 99 p-cars are broken or not working after the abuse they have gone through.
Did you change your gear oil and not add an additive?
You should have a sticker on your hood with the option codes.
If it's been lost, you can call 1-800-porsche and give them the VIN and they can tell you what you have.
It's pretty tough to tell when they're bad unless you're doing extensive analysis. LSD's are designed to slip in situations where having the rear wheels locked together would be hard on drivetrain parts. For instance in tight 90 degree turns the units are ment to slip...so if you're seeing wheel spin when coming off of a slow, tight 90 degree bend it's not necessarily a sigh that the unit is bad...it's just doing it's job.
Now if you're getting inside wheels spin coming off of a 60-70mph sweeper at a track then that's a pretty good sign that your unit is shot.
My 99 has LSD...and from my track experience I can still tell it's back there doing an OK job.
The best and easiest way to tell if it's still functioning (although hardest on the car) is to simply go out and leave from a standing start in a straight line hard enough to spin the rear tires...then go back and see if you've got 1 or two marks on the pavement as in a straight line the LDS should always leave behind 2 as long as it's still working. When they're bad they basically slip all the time and function like an open diff.
Andy
Traction control is a component of PSM. If you have PSM, you have traction control. As far as I know, the only cars with traction control and no PSM are the Carrera GT and the 997 GT3/RS. I wonder if there is confusion about the "traction control" which operates at low speeds only by applying the brake to the spinning wheel. I think it is called ABD. That is NOT the same as a limited slip differential at all. Nor is it traction control in the sense of PSM or TC on the C-GT and 997GT3s.
Regards,
Hey Bob,
my car has both ABD and TC, but no LSD. (Damn thats alot of initials). They all had separate #'s I think they are: 220(TC), 222(LSD), 224(ABD), but I am not 100% on the actual numbers. So traction control was definitely offered on early 996's and it is not mistaken by owners for ABD. Although it sounds like the whole system was simplified by PSM, at least as far as ordering it goes.
My mechanic today called his transmission guy about the issue. Turns out he said a lot of the 99's after a season or 2 of heavy driving have problems and will function like an open diff. Given my car has 88k miles on it, I can accept this because its going to cost a fortune to change it out and I would rather spend that money on tires.
This is a source reference. Confirm exact model applicability in the original material.
