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      08-23-2016, 08:20 PM   #1
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Transmission overheating error

Lately I've been getting transmission overheating errors, which seem to not correlate to driving behavior. It happened a few times when I came off the freeway and end in stop and go traffic, but lately it's been doing it on a "warm" start, after I used the car an hour before starting it.

It goes into limp mode and doesn't want to use the second clutch, causing long shift times. It also comes and goes, which to me is an indicator that it's not the actual temperature, but rather a faulty sensor.

Thoughts? Has anyone else ran into this issue? How much was the repair?

Thanks,
Dennis
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      08-23-2016, 10:26 PM   #2
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Guesses

Quote:
Originally Posted by flxfxp View Post
Lately I've been getting transmission overheating errors, which seem to not correlate to driving behavior. It happened a few times when I came off the freeway and end in stop and go traffic, but lately it's been doing it on a "warm" start, after I used the car an hour before starting it.

It goes into limp mode and doesn't want to use the second clutch, causing long shift times. It also comes and goes, which to me is an indicator that it's not the actual temperature, but rather a faulty sensor.

Thoughts? Has anyone else ran into this issue? How much was the repair?

Thanks,
Dennis
My first thoughts are DCT oil change (check that the seals aren't leaking and the DCT oil isn't low. Second thought are temperature sensors. From the drive logic manual I somehow found on the internet...

MDCTTransmission Sensors
The following sensors are mounted in the transmission and their signals are sent directly to the M DCT electronics:
  • Input shaft 1 speed (Hall) sensor monitors rotation and direction of transmission shaft 1.
  • Input shaft 2 speed (Hall) sensor without rotation direction detection for the transmission shaft 2.
  • Clutch oil pressure (Piezo) sensors for clutch 1 and 2.
  • 3 temperature sensors (NTC), one for the ejected clutch oil and two redundant temperature sensors for the M DCT electronics.
  • 4 linear (Hall) sensors monitor the selector rod position.
  • 1 double (redundant) parking lock (Hall) sensor.
The oil sump temperature is measured using a complex temperature map and checked against the temperature of the clutch oil by the M DCT electronics.
Other thoughts, such as the oil pump or oil to coolant heat exchanger, are expensive items.
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      08-23-2016, 10:37 PM   #3
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Quote:
Originally Posted by flxfxp View Post
Lately I've been getting transmission overheating errors, which seem to not correlate to driving behavior. It happened a few times when I came off the freeway and end in stop and go traffic, but lately it's been doing it on a "warm" start, after I used the car an hour before starting it.

It goes into limp mode and doesn't want to use the second clutch, causing long shift times. It also comes and goes, which to me is an indicator that it's not the actual temperature, but rather a faulty sensor.

Thoughts? Has anyone else ran into this issue? How much was the repair?

Thanks,
Dennis

Have you pulled the diagnostic codes to see what the exact error(s) is? Until you do that, it's just a guessing game.
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      08-30-2016, 01:47 PM   #4
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I don't know the exact error codes but I know it was a tagged as a red and a black diagnostic warning. I'll try to get the codes.

Edit: their diagnosis was:
Quote:
"Update transmission temperate module with software update (Module is outdated and reading incorrectly)"
Not sure how likely, but I'm still waiting for the error codes.

Last edited by flxfxp; 08-30-2016 at 04:35 PM.
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      08-30-2016, 06:24 PM   #5
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5A53 GEARBOX OVERHEAT PHASE RED
5A54 GEARBOX OVERHEAT PHASE BLACK

The service tech said that this could be because of an old software update, has anyone seen this before?

Thanks!
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      08-30-2016, 06:28 PM   #6
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Reference: http://www.m3post.com/forums/showthread.php?t=406735
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      09-02-2016, 07:02 PM   #7
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Update: after upgrading the transmission, the error unfortunately still persists. Has anyone come across this issue? Thanks
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      09-03-2016, 12:44 AM   #8
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Quote:
Originally Posted by flxfxp View Post
Update: after upgrading the transmission, the error unfortunately still persists. Has anyone come across this issue? Thanks
Yes, either your clutches burned or the electronics fried, or your harness is shorting, exposed.
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      10-12-2016, 03:48 PM   #9
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Update: 1 week after taking the effort of replacing the DCT temp sensor, this issue reared its ugly head again yesterday at 83543 miles. Got off the freeway, got the error when I was standing still at a light on a hill in SF.

Quote:
Yes, either your clutches burned or the electronics fried, or your harness is shorting, exposed.
According to the mechanics, the clutches still look like the have 50% life in them. Things that I think it could be:
  • Transmission fluid leak: would explain why it happened on a hill, could be a red herring
  • Wiring harness
  • Clutch alignment: constant rubbing generates heat

Let me know if anyone has other suggestions.
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      10-12-2016, 04:25 PM   #10
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Quote:
Originally Posted by flxfxp View Post
Update: 1 week after taking the effort of replacing the DCT temp sensor, this issue reared its ugly head again yesterday at 83543 miles. Got off the freeway, got the error when I was standing still at a light on a hill in SF.



According to the mechanics, the clutches still look like the have 50% life in them. Things that I think it could be:
  • Transmission fluid leak: would explain why it happened on a hill, could be a red herring
  • Wiring harness
  • Clutch alignment: constant rubbing generates heat

Let me know if anyone has other suggestions.

Fluid leak should be obvious. Get under the car, wipe everything clean, and check it daily for drips.

Wiring damage should be obvious too -- inspect for fraying, loose or broken connectors, etc.

Clutches can be realigned with the right diagnostic tools. They're self-adjusting but there is still a manual process.
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      10-12-2016, 06:16 PM   #11
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Fluid leak should be obvious. Get under the car, wipe everything clean, and check it daily for drips. -- as far as I know, it's not leaking fluid. Could it potentially be the pump, not providing enough cooling?

Wiring damage should be obvious too -- inspect for fraying, loose or broken connectors, etc. -- how difficult is it to replace that?

Clutches can be realigned with the right diagnostic tools. They're self-adjusting but there is still a manual process. -- any more info on this?

Thanks,
Dennis
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      10-15-2016, 05:06 PM   #12
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It happened again today at 83781 miles and I was able to record two reproducible videos.

Highway: https://youtu.be/SfaDqWCDl6E - I was driving from on the highway and noticed sluggish shifting prior to the overheating error. I was able to clearly reproduce the conditions and outcome of the overheating error. The error occurs when downshifting to 6th and once it's back in 7th gear it gives the overheating error for approx 20 secs.

1st Gear: https://youtu.be/NWA6g0NulCA - In this video I'm a stop sign. As soon as I pull up from a dead stop it gives the overheating error. Prior to this video it also gave the overheating error when sitting dead-stop in traffic with my foot on the brake. This time the car was not on a hill.

I'd love to hear any thoughts on this!
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      10-24-2016, 08:17 PM   #13
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Update: I brought the car to the shop again and they tested a variety of circumstances. They thought the error was resolved by performing a reset of the DCT control unit, re-running all calibrations and test driving the car, they had no issues.

As I pull out of the street of my garage I get the error again! I'm about to pull my hair out, this is ridiculous. I've dropped almost 2,5k into trying to solve this issue.

They mentioned that any issue from here on out would be expensive/impossible to fix, such as replacing the solenoid valve for the oil sprayer, mechatronics, etc.

Can anyone out there help me? I'm getting desperate
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      10-24-2016, 10:58 PM   #14
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Plugged cooling lines or internal bearings going bad could be something to look at. The latter obviously means a new trans.

Likely at this point if seriously consider sourcing a low mileage used unit. 3-4K done deal.
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      10-24-2016, 11:05 PM   #15
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Quote:
Originally Posted by flxfxp View Post
Update: I brought the car to the shop again and they tested a variety of circumstances. They thought the error was resolved by performing a reset of the DCT control unit, re-running all calibrations and test driving the car, they had no issues.

As I pull out of the street of my garage I get the error again! I'm about to pull my hair out, this is ridiculous. I've dropped almost 2,5k into trying to solve this issue.

They mentioned that any issue from here on out would be expensive/impossible to fix, such as replacing the solenoid valve for the oil sprayer, mechatronics, etc.

Can anyone out there help me? I'm getting desperate
I would change shops if they made you pay that much and didn't fix anything. You could have put that amount towards a used trans.
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      10-25-2016, 12:04 AM   #16
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This is why I am fine paying the premium to go to the dealer: they don't just arbitrarily replace parts until something works.
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      10-25-2016, 05:07 PM   #17
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Finding a good shop is always hard. I'm lucky I can go to the BMWCCA NY Chapter Master tech when I don't want to do something myself
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      10-25-2016, 07:24 PM   #18
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Did you do an engine tune before this all started? I remember I got this a couple of times on the dct side after a change on the engine software and it went away once the dct adaptation was reset later. Now I reset the dct every time I try a new tune on the engine.
If your shop did reset the dct and not just reflash it, and you still have the issue, you might have to reflash a regular engine soft to check if it goes away. If successful, then find someone else who does a better job at soft tunes.
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      06-26-2017, 06:18 PM   #19
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how was this resolved? I just had an overhead problem today. codes say unknown code
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      06-26-2017, 06:39 PM   #20
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I didn't; for the past 7 months it didn't give me an error. Until last week.
It's a coincidence that you responded to this thread, because I was about to respond to this thread.

It seems that it has reared it's ugly head again, and I can't figure out for the life of me why this suddenly is happening. It can't be the ambient temperature, because it was heavily giving errors during (Norcal) winter. Now it's warmer, it doesn't make sense.

Yesterday I drove down to San Jose to pick up a package. This was at highway speeds with an outside temp of 74F.

On the way over, it kept making errors, over and over again:

I was in 7th gear and driving at a normal pace, no hard accelerations, downshifts etc.

After I picked up my package (car was briefly turned off) and went home, I didn't get any errors at all:


This whole problem is making me tear my hair out, I simply don't get it. I don't think it's a faulty controller because the last time during winter it flipped out completely and there was the distinct smell of clutch burn. Maybe it's the cooling system or pump? Maybe a clog?

$100 for the person who can put disseminate this problem logically and give a good suggestion, without randomly swapping out parts again.

Cheers,
Dennis
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      06-26-2017, 07:03 PM   #21
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Mine e was jumping to 2nd gear but then seemed to go I to neutral. Red cog on the dash. Going to check for leaks.
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      06-26-2017, 07:07 PM   #22
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Yeah, I've had that happen in the past as well.

In this case the car still seemed to be continuing to behave as normal, it didn't go into limp mode. As my dashboard read out "Continued driving possible".

Please do let me know if you find the root cause of your issues, because I'm running out of options apart from replacing the entire transmission.
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