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  #11  
Old 12-05-2018, 11:48 AM
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Crazy you can't just get the selector switch. Do you get wonky gear position indications? At one point my dash showed I was in gear "54". All indications were a hardware problem with the selector switch. Mine is a separate part but with the 3.0 5 speed auto, the selector switch is inside the transmission but you can remove without taking out the valve body.

I took out and cleaned the inside of the TCM from the ebox as I found indication of water / corrosion inside the TCM so I cleaned that and the contacts in case it was a wiring problem between transmission and TCM.

Clean your TCM connector and then use scanner to read real time PRND[L] (love how the guy pronounced like a word prundel). I was about to take the bottom off my transmission to refurbish the selector switch when I discovered in my case the connector was filled with rusty water. If the selector switch is futzed you should be able to read non match values such as reporting neutral when in drive.

If the selection is stuck in neutral or park you can still start you'll get a non start condition if it sticks in any other position as the computer won't allow start when not in P or N.

In my case shorts on the connector would show in multiple gears simultaneously and the computer reported gears that don't exist. The scanner would show the binary coded value such as "14" but it's not an actual gear so it showed literally "gear ???".

The scanner is literally telling you your trans range selector switch is not reporting correct values, so likely it's a hardware problem on the switch but I would eliminate wiring so check the connection on the other side of the bundle (eg at the TCM in the ebox) and look for broken/shorted wires in the bundle before pulling out the valve body to assess the slide switch if you have the same transmission as the video.

Some V8 X5 have an external selector switch that's very easy to remove and replace I was pretty bummed to find out mine is inside the transmission.
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  #12  
Old 12-05-2018, 11:55 AM
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When my transmission was reporting the wrong gear I got all sort of bad mojo: would stick in 1 too long and slam shift into 2, it would stay in 3 and slam shift into 2. I got a failsafe before it showed incorrect gear on the dash but eventually I got visible feedback on the PRND display usually that it just didn't show the gear.

People have posted on xoutpost success in getting around problems with selector switch by using manual shift but it's definitely a band aid and can fail permanently any time so if it's the selector switch it needs to be repaired.. hopefully can be cleaned or sent in for repair just like in the video.


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Old 12-05-2018, 01:33 PM
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Yeah, that sounds fairly similar to mine. It's never displayed a number though - is there a section in the hidden menu that shows the selected gear? Mine lights up PRND when in failsafe.

The thing that I'm not quite sure of is when they talk about the 'switch' being at fault, are they referring to a selector that is a part of the shifter stick, or the slide switch on the valve body...?

What I am definitely sure of is that my trans is not the same as this one on Pelican Parts and therefore the switch is definitely NOT external:

https://www.pelicanparts.com/techart...eplacement.htm

Mine is this one as per RealOEM and has the same slide switch on the valve body that the guy is working with in the video:

RealOEM.com - Online BMW Parts Catalog

When the trans goes into failsafe, all PRND lights are illuminated on the dash. R, N and D can be selected without the need to pump the brake and when R is selected, the reverse lights do not come on.

We tried shifting through the gears with the car hooked up and it was reading correctly. However, it was not in failsafe at this point. Based on the fact that mine only kicks to failsafe when it has warmed up (1/4), PRND all being lit up, being able to shift through without engaging the brake and the reverse lights not activating when selecting reverse, I can relate to the issue in the video 100%.

Aside from all that, the shifting is horrible sometimes. As I mentioned before, it can sometimes get to 3500rpm in 1st before it finally grabs 2nd gear. The car jolts each time it does shift and when failsafe does eventually happen, PRND are all lit up simultaneously.

I think this might be it... just a shame it's right up inside the trans! At least I'll get new fluid and a filter. Although, that seems to have conflicting results on these cars too.
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Old 12-05-2018, 02:55 PM
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If you get wonky PRND display it's for to be either the selector switch like the video, the wiring or the TCM in the ebox under the hood. Electronics hate heat u think there is a fan on the V8 E53 in the ebox that could fail and let the TCM over heat so I would definitely check out under the hood since it's so much easier than disassemble transmission. I was completely expecting to change out or refurbish my selector switch based on nearly identical symptoms you describe.

I was able to get my PRND display to work some times by rapidly shifting through the gears. (I was thinking I was rubbing the contacts clean but really we just getting lucky with the digital signal sometimes not shorting through the rusty water) you can try to do the same and see if you can get the PRND display to come back to life with quickly running the stick through the gears (while stopped of course)


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Old 12-06-2018, 12:13 AM
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This does not sound like it's the same issue as yours...but I got the 'Trans Fail Safe' mode on my cross country trip in the middle of Texas at 110F.

In my case, the main issue was the ABS module. My alternator was also on its way out.

But I don't think it's the same for you. For me the whole car was on safe mode, no more a/c, no more cluster, only 2 speed working on the transmission, etc.

Just throwing out there in any case.
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Old 12-06-2018, 01:17 AM
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The "master caution" situation where everything shuts down is from low voltage. The situation here has a specific egs error (selector switch) no other errors related to voltage, but yes, definitely make sure voltage never dips below about 13.2
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