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Code P1747

5098 Views 8 Replies 5 Participants Last post by  wahnsinn
P1747 MERCEDES-BENZ - Electronic Gear Selector Module: Defective Interaction of CAN With Control Unit Instrument Cluster

This current fault code is set on my vehicle. Sometimes it is only pending; sometimes it goes away. Is this fault code related to an instrument cluster issue or a gear selector/transmission issue? CAN is a network? My instrument cluster behaves erratically—flashes lights, freezes, doesn’t work at all, or works normally. I have no shifter/transmission problems.

Is the domelight on the same curcuit as the instrument cluster?

Any advice appreciated.
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I still have my P1747 code. I was told by another source as well that the instrument cluster was the problem. It has occasionally exhibited all manner of erratic behavior including freezing or going dead while driving, flickering lights, twitching gauge needles etc. but 95% of the time it’s OK.

I have looked into replacing mine with a used instrument cluster but have hesitated because it will display the odometer reading of the original car which won’t agree with the title and it will be as old as the one I have and just as prone to flaky behavior. The problem is usually caused by a bad capacitor on the cluster but I can’t see any obviously bad ones on mine. Some, but not all, of the clusters fo the W140s are the same as the R129 cluster (and there were many more W140s made so they are easier to find) but you must check which ones are compatible with your VIN and model year.

The frustrating thing is that the car drives fine, but this code, which is completely unrelated to emissions, has kept me from getting it smog checked and now my registration has expired so I need to do something quick. Good luck.
There are cool smog places all over socal to help you pass and be done with it lol. I can look for you and make a recommendation. I was lucky, I used a totally legal trick when purchasing my car to avoid smog.
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