7 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHtorque converter specifically code PO740
Reported or suspected cause
valve body not controlling the fluid pressure
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
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 report identifying a cause
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.
Reported cause
The code P0740 on the 996.1 cars ( which all have the ZF 5hp19 trans) is caused by the valve body not controlling the fluid pressure, then extremely high pressure is sent to the lock-up converter which blows the rubber seal/o-ring, then the clutch begins to slip..
Leading evidence: 'valve body not controlling the fluid pressure' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'valve body not controlling the fluid pressure' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Repair cost' (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.
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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
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Suggestion · Original poster
Does this sound like a fair diagnosis and repair cost?
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.
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Suggestion
thankyou for replaying, in my case transmission fluid got mixed with coolant, after replacing gasketfilter, oil cooler, cleaning everything inside gearbox including removing torque converter & removing old fluid.
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.
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1
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Suggestion
I got fault P0740 & gear set moniter fault code for gear 4 & 2.
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Suggestion
thankyou for replaying, in my case transmission fluid got mixed with coolant, after replacing gasketfilter, oil cooler, cleaning everything inside gearbox including removing torque converter & removing old fluid.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
valve body not controlling the fluid pressure
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that report identifying a cause
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.
Reported cause
The code P0740 on the 996.1 cars ( which all have the ZF 5hp19 trans) is caused by the valve body not controlling the fluid pressure, then extremely high pressure is sent to the lock-up converter which blows the rubber seal/o-ring, then the clutch begins to slip..
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.
7 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: 20261027T075545Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi
I am not a regular in this forum but want to help out a neighbor who has a 996 Tip. He just had it towed to a shop as the car was stuttering and then the check engine light illuminated.
Shop says it needs a new tranny due to P0740 code. The cheapest option they say is a refurb unit $5K and $1.5K labor.
Does this sound like a fair diagnosis and repair cost? Any other options?
Thanks
What year is the car? Up to 2001 996 had ZF automatics. 2002 and up they have 722.6 Mercedes transmissions. If the latter there should be plenty of parts available as the tranny internals are used in several Mercedes, Chrysler and Jeep models. Labor sounds right as the engine and tranny come out together. Some here stated they removed the tiptronic with the engine in place, but my Indy couldn't do it after a few hours of trying and ended up dropping the whole drivetrain. Once on the ground it's fairly easy to separate the transmission. Of course with the engine on the ground there are all the "while you have access to" things to replace. What is refurbed in the transmission other than filter and fluid for $5k? Your friend may be better off finding a transmission shop that can rebuild his tranny.
It�s a 1999.. I appreciate the feed back, I�m just trying to help him out, seeing as I don�t know anything about the 996 I said I would reach out to Rennlist crowd. It�s a shame as he recently started to refresh some items such as redoing the seats. Now he wonders if he should just sell the car as a parts car. Makes me sad
The code P0740 on the 996.1 cars ( which all have the ZF 5hp19 trans) is caused by the valve body not controlling the fluid pressure, then extremely high pressure is sent to the lock-up converter which blows the rubber seal/o-ring, then the clutch begins to slip.. that sets the code P0740...
The fix is a new/remaned valve body and torque converter ..
BUT most shops either will not work on Tiptronics, or they will only warranty it if you do the whole ball of wax....ie " full rebuild"....
Of course if you DIY it, you can fix it the way you want, and if there is nothing wrong with the rest of the Trans...( ie no broken parts or big debris in the pan) it can be a rewarding decision...
thankyou for replaying, in my case transmission fluid got mixed with coolant, after replacing gasketfilter, oil cooler, cleaning everything inside gearbox including removing torque converter & removing old fluid. Flushing around 6 times, now PNRD shifting while car is in lift, but as soon as we put the car down, it shifts but only reverse working, drive does not work, even if i accelerate car is not able to move.
I got fault P0740 & gear set moniter fault code for gear 4 & 2.
thankyou for replaying .
If both gear 4 and 2 are "ON" at the same time, the car will not move . That is essentially what a "trans brake " does in Drag Racing , it applys 2 gears at once ( 1st and 2nd) then releases 2nd gear for the "launch" ...
Sound like you need a Torque converter, valve body, and maybe a 4th and 2nd gear solenoid....
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