P0740 TCC Failure - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-14-2009, 10:05 PM   #11
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Try out Auto Parts Fast at RockAuto I've had great luck with them
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Old 05-15-2009, 02:16 PM   #12
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RockAuto didn't list the upper tube on their website so I called them and they only carry the one for the na 3800 not the supercharged models. I guess I'll put in a request in the wanted section. Any ideas?
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Old 05-15-2009, 02:40 PM   #13
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I think there'* a few cars beign parted out, you can try that. Wish I had one here for you, sorry.
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Old 08-03-2009, 10:47 AM   #14
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Hi,

I have the p0740 too. I wanted to know if you could finally get rid of the code?
My car is a '95 riviera */c.
Thanks!

Last edited by johnd89; 08-03-2009 at 10:49 AM.
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Old 08-05-2009, 01:38 AM   #15
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No, not yet. I still haven't fixed the leak in the egr tube but hopefully I will get that done tomorrow. One possibility is the valve body in the tranny. I haven't taken it to a transmission shop for diagnosis but some people have had success with valve body kits.
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Old 08-05-2009, 12:02 PM   #16
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I gather this may be the fix
Sonnax Transmission, Torque Converter, Performance, Driveline Parts :: Transmission :: 84754-97K :: Part Summary
I would try installing an aux tranny cooler to try and fix the issue before that...
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Old 08-05-2009, 08:10 PM   #17
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That may work but I did install a tranny cooler and I still have the probelm.
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Old 08-05-2009, 09:44 PM   #18
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The part that Johnd89 mentioned probably won't help you. That valve controls the on off function for the tcc. Your tcc is turning on. The problem is low apply pressure for the clutch. This is the part that would most likely help you.
Sonnax Transmission, Torque Converter, Performance, Driveline Parts :: Transmission :: 84754-01K :: Part Summary
This valve has extreme wear since it constantly buzzes in the bore while tcc is engaged. The other valve just clunks back and forth for engagement and disengagement.
I do not recommend going into the valvebody unless you have experience working on trannies. I have seen many people in the trade make mistakes.
But if you do try, Make sure you have new valvebody gaskets ready. And don't lose any of the check balls that will fall out.
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Old 08-06-2009, 12:45 AM   #19
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for the clarification Tequila Man!
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Old 08-06-2009, 09:32 PM   #20
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No problem, glad to help. I am a transmission rebuilder, so feel free to ask if you have any questions.
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