P0743 Torque Converter Clutch Solenoid Circuit Electrical - SaabCentral Forums
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  #1  
Old 31st August 2011
firehawk618 firehawk618 is offline
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Default P0743 Torque Converter Clutch Solenoid Circuit Electrical

So getting P0743 Torque Converter Clutch Solenoid Circuit Electrical.

I tested continuity at the connector under the battery tray and have isolated the problem from that connector to the solenoid. My next step is to access the valve body to check resistance again. Either it's the harness or the solenoid.

My question is, where is the valve body on this car?

How is it accessed? Hopefully don't have to remove the trans to get to it.

Car's a 2001 9-5 Aero 4 speed auto.

Thanks in advance.
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  #2  
Old 1st September 2011
firehawk618 firehawk618 is offline
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Wow the lack of responses makes me think these transmissions are pretty damned reliable.

I'll update with what I find in mine.
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  #3  
Old 1st September 2011
firehawk618 firehawk618 is offline
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Welp, valve body is on the front of the trans "as mounted in car". Access to it is pretty straight forward, remove the bracket for the mount, unbolt the cover. There it is.

Pulled off my torque converter lockup solenoid and it tests bad. I'm getting ~17k ohms on it. Definitely way out of spec.

Now the fun part, try to find JUST a new solenoid......

Mine's the green one if that helps.
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  #4  
Old 2nd September 2011
firehawk618 firehawk618 is offline
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First pic: Torque converter lockup solenoid that's fried

Second and Third pic: Shift Solenoids





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  #5  
Old 2nd September 2011
firehawk618 firehawk618 is offline
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Installed the new solenoid today. $135 ! OUCH

Pretty easy, re-installation including chaning the engine oil took me around 1 hour.

Cleared out the old transmission fault code, took it for a spin.

Lockup works perfectly.
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  #6  
Old 12th November 2011
Hardeepone Hardeepone is offline
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Wow I gotta say thank you, I have the same issue and I'm looking to get it replaced, but didn't know where to begin.

I got the dreaded P0743 code as well, and I'm trying to find out what it is and how to fix it. So I'm going to go for the solenoid.
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  #7  
Old 13th November 2011
firehawk618 firehawk618 is offline
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If you have any questions feel free to MSG me here or email me at firehawk618@gmail.com
Quote:
Originally Posted by Hardeepone View Post
Wow I gotta say thank you, I have the same issue and I'm looking to get it replaced, but didn't know where to begin.

I got the dreaded P0743 code as well, and I'm trying to find out what it is and how to fix it. So I'm going to go for the solenoid.
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  #8  
Old 12th January 2012
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xjasonblackx xjasonblackx is offline
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what is the part number for this??? so i can replace mine. :-D
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  #9  
Old 15th January 2012
firehawk618 firehawk618 is offline
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Sorry guys I do not have the part number.

My local stealer was able to locate the part and the part number. IIRC they wanted ~$400 for ONE SOLENOID!!!! What a rip, it's NOTHING SPECIAL!

I ended up sourcing one through a friend of mine who rebuilds transmissions. He used his supplier and got one, it was about $125. Yes still WAY too much for a transmission solenoid "avg one is $25 or so on a lot of other cars" but anyhow, much better than dealer price.

Good luck all.
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  #10  
Old 24th January 2012
shnaaby shnaaby is offline
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I have been getting a po743 code and i was sure the solenoid was fried. I ordered a new one and installed it. After i got it all back together I took the wagon for a spin and it seemed to want to stall while shifting from 1 to 2 (lots of shuddereing around 15 - 20 mph). I checked all the fluids and everything was good. All connections were good too. I ended up putting the fried solenoid back in and the trans went back to normal shifting with no shudder and no stalling.
Did i perhaps install the wrong solenoid? I could have sworn I purchased the correct one....
It was for a 2001 9-5 wagon v6.
Any ideas anyone?
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  #11  
Old 24th January 2012
shnaaby shnaaby is offline
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the Solenoid I installed looked different than the one I removed. The parts diagrams can be confusing but as far as i could tell all the part numbers match up....
This is what the solenoid looked like....
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  #12  
Old 24th January 2012
firehawk618 firehawk618 is offline
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If the solenoid looked different then it was probably wrong.

The new one you installed must be forcing the converter to lock up when the ECU isn't commanding it.

Get the right one.
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  #13  
Old 27th April 2012
firehawk618 firehawk618 is offline
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Hmm for some reason I can't figure out how to edit my post where my picture links are broken so here's the photos again due to the many many requests.

1st and 2nd photo are just of the solenoids on the valve body. 3rd photo is the actual defective TCC lockup solenoid.

Please read this post thoroughly. I will not answer any emails asking questions where the answer has already been posted here.

Not trying to sound like an ***, it's just I'm very busy and don't want to repeatedly answer things that are answered here.

Thanks!

Oh yeah, my car has been running / driving flawlessly since this fix, I've probably put on 8k miles so far!





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  #14  
Old 8th August 2012
mbyrne15 mbyrne15 is offline
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Where can I buy a TCC solenoid? I am having a hard time finding one.
2002 9-5 3.0 v6
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  #15  
Old 9th August 2012
jcm jcm is offline
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Pull one off a used trans as last resort. I just did this with success yesterday. You have a 5 speed so it will be a different unit.
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  #16  
Old 9th August 2012
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1AdamXII 1AdamXII is offline
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What are the symptoms of this solenoid going bad? Will it always code out?

I've got new 1 and 2 shift solenoids, and new T-IV fluid, but am gettting some hard shifts when warm. No more flares, just some mild hard shifts. Is this the 'washer' fix, or could this be related to the TCC solenoid?
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  #17  
Old 12th August 2012
kristin_lpn kristin_lpn is offline
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Default range of specs?

Quote:
Originally Posted by firehawk618 View Post
Welp, valve body is on the front of the trans "as mounted in car". Access to it is pretty straight forward, remove the bracket for the mount, unbolt the cover. There it is.

Pulled off my torque converter lockup solenoid and it tests bad. I'm getting ~17k ohms on it. Definitely way out of spec.

Now the fun part, try to find JUST a new solenoid......

Mine's the green one if that helps.

I know this might sound like a really dumb question but what are the range of specs of the solenoids? I'm having some weird issues with my 9-5 and its throwing 4 different codes including the P0743. I've tried finding a manual but so far, not much luck. So, can you tell me where the ohms should be range wise so that I could know what I'm looking at? I've never had to deal with the weird stuff my car is doing...lol. Its amusing really. I never thought I was stupid until I bought my Saab.
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  #18  
Old 6th December 2012
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unclemiltie unclemiltie is offline
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There's a US-based aftermarket seller of solenoids for the AW55 (5-speed) transmissions that I've found. http://www.rostratransmission.com/

They don't sell the parts on their web site but there are a number of places on ebay that advertise that they sell them. The linear solenoid set is about $200 for three and the shift solenoids are about $250 for all of them. Rostra does indicate that they sell the solenoids individually.

there are guides there on how to install their solenoids as well. Quite an informative web site.
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  #19  
Old 4th August 2014
Saab95Reyes Saab95Reyes is offline
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Anyone have pics or a. Clue as to the location of the solenoid?
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  #20  
Old 4th August 2014
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unclemiltie unclemiltie is offline
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All of the solenoids (both 4-speed and 5-speed) are inside the cover of the valve body in an area that is soaked with AFT. Fortunately for us the cover of the VB can be removed with the transmission in the car.

There is a tutorial from me on how to change the solenoids on the 5-speed (search on threads started by me, you'll find it), the 4-speed should be similar but the inside of the VB will look different.

It'll take you 4-hours or so to do the job the first time, I can now do it in 2 since I've had the VB cover and solenoids off of my car so many times.
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