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Old 12-23-2016, 08:40 PM   #1
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Please help; limp mode after transmission repair! 325 CI...

I will try to summarize my best, but getting anxiety from not knowing whats going on...

So I bought a 2001 325CI... drove absolutely fine, yet had a small ATF leak coming from within the bell housing.. turned out to be the input shaft seal and a "pump" gasket. Brought it to a local shop "Certified Transmissions"...

Now, up until I brought it to the shop even WITH a leak, it drove absolutely fine, no warning lights except the SES dash light.

They had my car for 4.5 days, finally went to pick it up, happy as could be. I picked it up, it drove absolutely fine for 24 hours following. I DID drive 40-50 miles through the day, where as I usually only go 15-20 per day.

Night after I got the car back, it was a rainy night... left the casino to find my car slipping into limp mode. Turned the car off, then back on- drove okay for 30 minutes following... then the same thing. Limp mode, restart, light disappears. At this point, the car would shift smoothly through 2nd, 3rd, 4th, but coming out of a dead stop (like at a red light or stop sign) it would rev up to about 1500 rpm, and then CLUNK, catch gears... it didn't feel healthy.

I disconnected the battery for 35 minutes, then reconnected, reset adaptions with the key turn sequence... still in limp mode. Checked voltage, seems to be fine at 12v steadily.

Next morning, turn the car on, still in limp mode- but this time itll rev up to 2k RPM and NOT move at all. I got it towed RIGHT back to the Transmission shop, told them that it drove fine before I brought it to them, and now it wont even operate. They just called me back and told me that everything from the Torque converter, to the solenoids, to the pump, look okay with no issues.

My question now becomes- what could the shop have done to screw things up, there for causing limp mode? And where do I go from here...

Ive heard suggestions like intake side camshaft sensor, cleaning the MAF, swapping the speed sensors, and lastly- the transmission wiring harness.

Any and I mean ANY opinions are appreciated.
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Old 12-23-2016, 09:00 PM   #2
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Very few mechanics really know automatic transmissions. They are extremely, and I mean extremely complicated. Even the best mechanics I know that can diagnose most thing in minutes and know the ins and outs of literally anything car related don't want to touch them. All I can really tell you is hopefully you have some kind of warranty.

That being said of I was in your shoes I would have brung it to a different shop or 2 that I trust just to get their opinion or diagnoses before bringing it to the shop that did the work. Something obviously went wrong. The question is did they mess it up or was it the used/rebuilt transmission that failed. I would imagine since their called "certified transmissions" they know their **** work and warranty wise and they would have been in this situation many times. Don't know what else to tell you, good luck.
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Old 12-24-2016, 10:31 AM   #3
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The shop told you "everything looked fine", but what about when they test drove it? They're a transmission shop, so should be able to diagnose the problem fairly quickly.
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Old 12-24-2016, 10:40 AM   #4
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The shop should be able to hook up their computer to the car and read the codes causing limp mode. If it's not the transmission causing, the codes will confirm it.
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Old 12-24-2016, 12:19 PM   #5
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I didn't read you're entire post so I don't know if you already tried this but:

*****check your fluid level.******

The auto trans will slip if the fluid level is low. HTH.
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Old 12-24-2016, 03:27 PM   #6
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Originally Posted by BaliDawg View Post
The shop told you "everything looked fine", but what about when they test drove it? They're a transmission shop, so should be able to diagnose the problem fairly quickly.
They said the transmission looks fine, everything from solenoids to valve body and everything, and they think its electrical. But that could mean a million and one things, and I need validation to feel okay, that it will be okay haha... just wondering what direction I might want to point the shop in, in terms of where to start
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anxiety, electrical, limp mode, transmission

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