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#1
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ZF 5HP24 Problems - help needed!
The first time I pulled the trans I replaced the torque converter and replaced the pressure regulator valve with the upgraded one from TransGo (to address issues with torque converter lock-up codes as well as harsh shifting and going into fail-safe). After getting the trans back in was still having problems now with a new series of codes. When selecting a forward gear (reverse functioned normally) there was a slight delay and then it "clunks" into gear. If by some luck it doesn't immediately go into trans safe mode by then it will shift harshly with the engine freewheeling/revving up before hunting for the next gear. The codes I was getting were P0750 and P0751 and seem to indicate an issue with "shift solenoid A." After doing a lot of research I became convinced it was an issue with the A-Clutch drum. The second time I pulled the trans I found that the O-ring seal between the A and B clutch drum was split which seemed to explain all the remaining symptoms I was having. I got the trans back in and went back for a test drive and noticed that it was no longer banging into gear when I engaged drive and was very hopeful that it was finally fixed. However, before I even got out of the driveway it went into fail-safe and I was absolutely devastated. It was showing the P0751 “Shift solenoid A stuck off” code again so I crawled back under the car to recheck the electrical connections and trans fluid level. Before I set off again, I reset trans adaptations with INPA hoping it may be a TCM learning issue. This time I actually got to witness the transmission shift and was astonished to see that it was behaving absolutely normally. The shifts were smooth and quick with no free wheeling or hunting for gears. I was really hopeful but after 2 miles of my test drive the dreaded fail-safe signaled itself across the dash even though it was otherwise behaving normally. I now have the trans out a THIRD time and have dug a bit deeper by disassembly the A and B clutch assemblies. I checked all their various seals expecting another leak, but everything looks pristine and undamaged. I used INPA to pull up the error history and noticed a low voltage error. Since the car has been sitting for so long my battery no longer holds a charge for more than a day or two without use and I usually have to jump start it before each test drive. I’m beginning to suspect that the issue may be a bad battery, but I would think when it's running it would have more than sufficient voltage to not effect function of the trans. I’m really at a loss here and don’t want to have to put the trans back in this car again until I’m certain I fixed the problem. Unfortunately, I’m out of ideas and I’m hoping that the collective knowledge of the forum may help me in this fiasco. Currently I feel doomed to be spending the rest of my life just pulling the trans and putting it back in again… |
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#2
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Man, what a battle.
I think you are on the right track with the battery. Low voltage will absolutely affect the shifting strategy. You've checked the sealing sleeves as well I'm sure. If not I would replace them but I think your issues are voltage related. Sent from my Pixel 4 XL using Tapatalk
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04 E53 4.8 98 E38 4.4 04 Touareg 4.2 (x2) 87 E30 (getting a 4.4/6spd swap) 89 E30, selling it 96 E36 parts car MK2 jetta with a 1.9alh swap 90 XJ Crawler 2000 XJ crawler in the works 63 Ragtop bug 64 Bug 06 F-350 to drag all the above when they brake. |
#3
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Forgot to mention, you can check the clutch packs for leakage with compressed air with the valve body removed.
Sent from my Pixel 4 XL using Tapatalk
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04 E53 4.8 98 E38 4.4 04 Touareg 4.2 (x2) 87 E30 (getting a 4.4/6spd swap) 89 E30, selling it 96 E36 parts car MK2 jetta with a 1.9alh swap 90 XJ Crawler 2000 XJ crawler in the works 63 Ragtop bug 64 Bug 06 F-350 to drag all the above when they brake. |
#4
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Quote:
I did air test the a/b drum, but I've not air checked through the valve body. Do you know of any way to confirm if the battery could be causing this without putting the transmission back in? Thanks again. |
#5
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Does your car have the IVM? Integrated Voltage Module.
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD |
#6
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maybe transfer case is going bad with the front drive shaft mine (mine clunked too going into gear) did that before my transfer case went just and idea
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#7
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Like you I had a problem with a slipping transmission, now 8 or 9 years back. I am curious about your approach to the problem. Why did you change the torque converter? I.e., what made you believe it was the source of the problem? Weres there any symptoms or diagnosis once you removed the torque converter that indicated a problem?
On the second attempt, did you change all the seals in the trans when you had it out? I had mine out at 93k miles and the seals were generally brittle and nasty. Something else maybe faulty if you didn't refresh them all. Did you clean out the valve body at the time? Finally. did you check that solenoid A is functioning properly? IIRC it can accessed with trans in the car. Although there are a lot of stories of bad batteries causing issues, your fault code is quite specific. Like you, I am inclined to think that once the car is running it should provide enough juice to run the systems, but a new battery wouldn't hurt.
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2003 4.4i black ext./black int./black headliner (kid's runabout) 2014 535d X-drive, M package, silver/black interior Sold but not forgotten: 2009 E70 35d, black ext./black int./black headliner (sold 2021) 2006 4.8iS Le Mans blue/cream int./black headliner, SOLD in 2012 sadly... Other hardware: 2015 Cayenne S (wife's new DD and definitely wroooommmmm) 2016 Tundra 1794 edition crew cab, luxo hauler 2005 Tundra crew cab, weekend hauler. Sold after 150k very happy miles. |
#8
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Quote:
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2003 4.6, esotril blue, over 215,000KM. Every previous owner failed to keep up the vehicle maintenance. Restoration project. |
#9
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I actually have not checked the sealing sleeves. Would anyone be able to tell me where they're located and how to check them? Is it possible for these sleeves to cause my symptoms? |
#10
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I believe either within the "coding" or "error" menu within INPA there is an option to "reset transmission adaptations." In my opinion, this is a more full proof way of doing it over the gas pedal method. |
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