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Shrocky5 05-10-2021 09:06 PM

P0733 2002 sl2
I have a 2002 SL2. The past few days the transmission has been acting up. Harsh shifting through the gears usually during acceleration. If I'm going like 65 on the interstate, when I hit the gas to speed up... when it down shifts it slams really hard. 2 days ago it was having trouble going from 3rd to 4th gear. Today when the SEL light came on it was not downshifting into 3rd from 4th. It would go from 4th to 2nd and then Rev up. Fluid and filter has been changed religiously every 30k since the car was new. It has 227,000 miles on it now. All trans parts are original. Never had a valve body, solenoids, etc. Fluid is full and clean. Would it be worth changing any solenoids or the whole valve body, or does this usually mean the transmission is shot?

billr 05-10-2021 10:21 PM

Re: P0733 2002 sl2
First, check the three fuses for the trans. And swap the fuel-pump relay with a similar one from elsewhere on car.

Shrocky5 05-10-2021 10:48 PM

Re: P0733 2002 sl2
Thanks. Will check those things tomorrow. I must admit that it's had intermittent harsh shifts for quite some time. But it's been intermittent enough I just kind of ignored it. Until the past few days I've never had any codes and it's never had any trouble going into gears like it has the past couple of days. The P0733 is the first code it's ever thrown for the incorrect ratio on 3rd gear.

bluesl2 05-11-2021 12:42 AM

Re: P0733 2002 sl2
The later years of the S-series had a few issues with the main line pressure solenoid as well. Usually it would make the transaxle shift hard. If you don't see any issues with fuses it would be worth checking resistance on those five solenoids and comparing the resistance to each other. As little as 2 or 3 ohms difference can make the difference between shifting right or not.

Shrocky5 05-11-2021 11:53 AM

Re: P0733 2002 sl2
Inspected all fuses, and changed the fuel pump relay. No real difference that I could tell. All fuses were intact. Car was slamming into 3rd gear pretty hard until it warmed up. Once it warmed up it was driving almost normal. Still kind of a hard shift when in 4th gear, and you get on the throttle where it has to downshift into 3rd.

billr 05-11-2021 01:16 PM

Re: P0733 2002 sl2
OK, then check the solenoid resistances; that is easy to do.

If no joy with the solenoids, we have to start talking about checking line-pressure with a gauge, checking the ISN, and then the valve-body and air-checks.

Do you have live-data available? That isn't a "magic bullet" for problems with this trans, but may help eliminate some remote possibilities.

In many (most?) cases problems with this type trans (TAAT) are from the valve-body (VB). The VB is what causes the ISN to loosen, and the solenoids are part of the VB (but are the only part of VB that can be reasonably replaced separately). There seems to be no definitive way to prove the VB is bad, you have to check everything else and then throw a VB at it if nothing else is found wrong.

Oh, and check the car's system voltage; it should be in the 14-15V range when the engine is running. Some feel those solenoids are finicky and don't always operate properly if voltage is a bit low.

Shrocky5 05-11-2021 02:12 PM

Re: P0733 2002 sl2
I do have access to live data. I have a couple of scan tools. Nothing like a professional scan tool but ones that can pull codes and show basic live data.

I will check the battery later. The current battery in the car will be 5 years old next month. Never really gave it a thought that it could be on its way out since I haven't had any other typical battery related issues.

I am at least somewhat tempted to pickup a VB with the sonnex fix from ebay for $209 and throw at it. I wouldn't be able to replace the transaxle myself if it's not the valve body. Which means I'd probably end up having to get rid of the car. It'd cost way to much to get fixed at a shop. I can do the VB myself I belive after watching the youtube videos and reading through all the info on here.

billr 05-11-2021 03:43 PM

Re: P0733 2002 sl2
The battery won't be an issue, unless it is [I]so[/I] bad it sucks down the alternator; but in that case I think you would have noticeable cranking problems. the alternator should be keeping voltage well above any possible battery voltage when the engine is running.

If you get a VB, I recommend you be sure it has [I][B]both[/B][/I] the important Sonnax upgrades; the Booster and Pressure Regulator. Many vendors only do one or the other, but can advertise is has the "Sonnax upgrade". Central Valve Bodies near Tulsa, OK is one that I know does both.

Before going for a new VB, I would remove the VB and do air-checks of the clutches/servo. If the air-checks are OK, you can put the VB back on to continue using the car as-is until the new VB arrives. R & R of the VB is [I]very[/I] easy, you usually can re-use the cover gaskets and you don't need to drain any fluid. It is well worthwhile to check out the basic trans internals, via the air-checks, before throwing that VB at it.

Shrocky5 05-11-2021 04:33 PM

Re: P0733 2002 sl2
Checked the battery voltage. It's perfectly normal both engine off and running. Do you know if central valve bodies sells on ebay, or do you have to them direct to order. The ones I see online are from a vendor in Illinois. Looks like they only do the sonnex upgrade on the pressure regulator valve.

billr 05-11-2021 06:37 PM

Re: P0733 2002 sl2
CVB does sell on ebay, but I don't see a VB for the TAAT listed there. Call/email them for price.

DevinPotter 05-11-2021 09:47 PM

Re: P0733 2002 sl2
Ive had good luck with [url][/url] if you contact them tell them devin recommend them

Shrocky5 05-13-2021 08:41 AM

Re: P0733 2002 sl2
After I pulled those fuses for the solenoids, and put them back in, I haven't had any more issues so far. Drove the car around did 2 hours last night and it shifted perfectly. I'll play the wait and see game before I go any further. I'm nervous about taking all that stuff apart since the car is so old.

billr 05-13-2021 11:33 AM

Re: P0733 2002 sl2
Good plan. There is strong hint now that the problem is/was in the fuse panel connections; no need to look elsewhere unless the problem comes back.

Want to "tease the bear"? Remove the LP fuse and drive it with that fuse out; see if the problem returns. Then, re-install the fuse and see if it is cured again...

Eventually, you may have to remove that plastic top "mask" over the fuse panel sockets and check/tighten the wiring and sockets under there.

Shrocky5 06-14-2021 09:48 PM

Re: P0733 2002 sl2
I'm back. I've been experiencing the issue more. I thought pulling the fuses helped, but I don't think it did. What I've noticed, the slamming is much worse when the AC is on. I think that's why I thought pulling the fuse helped. We had a cool spell and I wasn't using the AC. It still does it with no AC, but not as bad. It seems like the slam is generally when you try and accelerate from 45 to around 70 mph. The downshift to 3rd is where the major slam occurs. Strange thing.... If I shift manually into 3rd gear accelerate, and then back into Drive no problems. No slams. If I'm going 45 or 50 and I give it WOT, no slam occurs, and I belive thats because it goes into 2nd instead of 3rd and then upshifts through 3rd and back into 4th. I did several runs this evening, about 45 mph, manually shift into 3rd accelerate lightly and hard. I was going from about 45mph to 80mph and then would shift back into 4th. No slamming when I manually did the 4th to 3rd downshift. Any ideas where to go from here? Do VB solenoids or anything in the VB still seam like they may be suspect? I haven't messed with the VB yet as I'm leary about taking it apart. I looked at TPS data on my scan tool and had nice steady percentage increases on the graph. No dead spots. Any help is greatly appreciated!

Shrocky5 06-15-2021 12:56 AM

Re: P0733 2002 sl2
This is exactly what my car is doing!! Except I did get the engine light only that one time.


Shrocky5 06-16-2021 07:50 PM

Re: P0733 2002 sl2
Well problem solved. I decided to just throw a valve body at it as I didn't want to have to take it all apart more than once. Ordered one from Ken Partin online got it next day. She shifts as good as my 2017 Sonata with 50k on it now. Smooth as butter. No more violent slam on 4 - - 3 downshifts. Thanks for everyone's help on here! Love this site. I've learned how to do so much stuff myself to keep the old girl running.

DevinPotter 06-16-2021 08:05 PM

Re: P0733 2002 sl2
[QUOTE=Shrocky5;2362289]Well problem solved. I decided to just throw a valve body at it as I didn't want to have to take it all apart more than once. Ordered one from Ken Partin online got it next day. She shifts as good as my 2017 Sonata with 50k on it now. Smooth as butter. No more violent slam on 4 - - 3 downshifts. Thanks for everyone's help on here! Love this site. I've learned how to do so much stuff myself to keep the old girl running.[/QUOTE]

A++ Thats great news! And great to hear. ive been watching to the side to see everyone's replys
Let us know if you have any problems with the vale body down the road

Shrocky5 06-17-2021 12:34 AM

Re: P0733 2002 sl2
Thanks will do! This really makes me wonder how many of these cars have been junked when all they needed was a $200 valve body to be good as new. Like the scotty Kilmer video calling Saturn's junk. He was sending that one to the scrap yard, when I'd say all it needed was a VB. In my opinion any car that's been on the road for 20+ years, the manufacturer did something right. I'd be happy if my Sonata lasts as long as this saturn has, but the way I keep hearing about hyundai engines blowing up when they have 80-100k on them you never know. The saturn may last longer than it does. It's a nice car, with all the modern safety features, and technology, turbo, GDI, etc... but all that stuff scares me when I think about the future when it all starts breaking lol. I purchased the extended warranty when I bought it, so it won't be be my problem for 10yr/100k at least lol. I just like the simplicity of the saturn. It's treated me very well over all these years!

DevinPotter 06-17-2021 01:08 PM

Re: P0733 2002 sl2
Cool.. Lol Hey how much was that extended warranty ?

Shrocky5 06-17-2021 01:26 PM

Re: P0733 2002 sl2
Lol. It was $1398 basically extends bumper to bumper warranty to 10 yr/100k. It's through hyundai with a $0 deductible. I didn't buy it when I bought the car, but my dad's 15 GMC Sierra had the head unit fail (its the touchscreen unit where climate control and other stuff runs through it) and it was $2000 to have it fixed. He didn't pay a dime though because he had an extended warranty. So I figured one repair and it may pay for itself. Guess we'll find out.

billr 06-17-2021 04:28 PM

Re: P0733 2002 sl2
When I bought my '97 Chevy van I got an all-inclusive 10 yr/100k mile warranty for $980. The deal was that I would get that $980 back at the end (which I did) if no claims were made. So, it cost me only the interest that I could have made on that 980 for 10 yrs.

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