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I've been dealing with the U016887 fault tied to sliding pano sunroof for months along with random module faults.
Took out the sunroof console and hit all the plugs with contact cleaner. The error has not come back.
All roads seem to go back to battery. New Battery was put in December 2024.
Has anyone dealt with an issue like this?
Last edited by Nicholi2007; Aug 8, 2025 at 05:10 PM.
I removed all the sunroof console plugs and sprayed them with electronic cleaner. So that resolved that but the battery drain remains.
I suspect the module is being kept awake or destabelizing CanBus network. The Telematics 3G module was deprecated as well.
So likely both contributing to drain. Trying to find remote SCN coding. The dealer labor rate is $304.88 an hour. Insane.
Last edited by Nicholi2007; Sep 24, 2025 at 05:19 PM.
Are you sure this is the error you are getting? Not sure what this error has to do with he sunroof.
The U016887 fault code indicates a communication error with the electronic ignition lock (EIS) in a Mercedes-Benz vehicle. This can be caused by faulty wiring, corroded connectors, or a malfunctioning EIS module. The primary symptom is the inability to start the car, even though the key may turn.
Are you sure this is the error you are getting? Not sure what this error has to do with he sunroof.
The U016887 fault code indicates a communication error with the electronic ignition lock (EIS) in a Mercedes-Benz vehicle. This can be caused by faulty wiring, corroded connectors, or a malfunctioning EIS module. The primary symptom is the inability to start the car, even though the key may turn.
It’s my belief transport mode is causing other faults in the system. The battery is now down to 57%. The dealership’s labor rate is now over $304.00 which is just absurd. I can’t find an Indie shop that has the software or access to fix it. I’m fawwwked.
Last edited by Nicholi2007; Sep 26, 2025 at 11:59 PM.
Find a shop to scan it with XENTRY.
I can’t tell you how many posts here are basically the same problem. Most aftermarket scanners just don’t have the full functionality and testing that XENTRY offers. Sometimes the scanners translate the code falsely. (kind of like an EIS code translated to a transport mode code
Throwing parts at these cars isn’t a good idea. Some of these aftermarket scanners have issues writing code. So repairs, while may have been done properly, the scanner just won’t write the firmware coding properly. If you’re saving $$$$ by not going to the dealership, might as well take some of that saved money, and at least use the diagnostic software they use to make your repairs.
As I wrote in another thread, XENTRY is one of those tools where you may never need it, but if you ever do, it’s indispensable.
You can spin your wheels and spend hours ripping your car apart testing individual components or spend 20 minutes running tests within XENTRY, never having to unbolt one part.
Not saying it’s guaranteed to solve your problem, but at least you’ll be assured (as long as you have properly installed XENTRY) that the data you’re getting and writing from your car isn’t just “made up” by the aftermarket scanner.
I would at least try a different scanner to see what code it kicks out.
Good Luck
Last edited by crconsulting; Sep 27, 2025 at 09:47 AM.
I've been dealing with the U016887 fault tied to sliding pano sunroof for months along with random module faults.
Took out the sunroof console and hit all the plugs with contact cleaner. The error has not come back.
All roads seem to go back to battery. New Battery was put in December 2024.
Has anyone dealt with an issue like this?
Originally Posted by Nicholi2007
I removed all the sunroof console plugs and sprayed them with electronic cleaner. So that resolved that but the battery drain remains.
I suspect the module is being kept awake or destabelizing CanBus network. The Telematics 3G module was deprecated as well.
So likely both contributing to drain. Trying to find remote SCN coding. The dealer labor rate is $304.88 an hour. Insane.
When you said error didn't come back did you mean the error code or transport mode? For what it is worth, researching this code and was mentioned a software update through XENTRY can solve it but on a different MB model so not sure if it is the same thing. That said, it shouldn't affect the functionality of the vehicle it just is a stored code that just comes back after clearing. I seen examples of the W205 having this code but doesn't affect the functionality of it.
@W205C43PFLClearly a parasitic draw going on which is causing faults and destabilizing CanBus network. U016887 fault tied to sliding pano sunroof has come back once the battery went under 60%. I have managed to get the battery up to 83% by driving but it won't stay there. I suspect the alternator has limits.
Possible Multi-Fold. The Hermes module. 3G Telematics service was deprecated and the amplifier connection is preventing the fiber loop from closing..This fault keeps coming back every few months.
@crconsulting AnyScan A30 is a solid reader but you're correct, it's not sufficient here. An MB specific scanner. iCarsoft MB II or MB V3.0 should give me a reliable scan.
My Working Theories:
1. Module is stuck in transport mode because it lost its coding (past low-voltage event). Odds 30-40%.
2. Most likely, SOC lockout. It's likely restricted until the system sees stable charge cycles.
Parasitic Draw:
The MOST bus (media system fiber loop) (likely bigger drain) + telematics 3G causing the overall parasitic draw. MOST fault is intermittent which is explains why battery % is worse some weeks.
ACTION ITEMS:
1. Buy a better scanner
2. Charge Battery
3. Check amplifier connection as I'm getting speaker 1 connection.
4. Put on optical by pass loop but will pull fuse in interim..
Last edited by Nicholi2007; Sep 27, 2025 at 01:36 PM.
. @crconsulting AnyScan A30 is a solid reader but you're correct, it's not sufficient here. An MB specific scanner. iCarsoft MB II or MB V3.0 should give me a reliable scan.
Originally Posted by Nicholi2007
ACTION ITEMS:
1. Buy a better scanner
I think it’s a good idea to scan it with a different scanner to compare results. I think I wouldn’t throw too much money at an aftermarket scanner. Either the iCarsoft V3 or, you may want to look at the Launch Creader. Folks here seem to use it with mixed results. I’m not sure I would trust them to recode components, but certainly good for reading codes and some testing. https://mbworld.org/forums/e-class-w...onal-more.html
Good Luck
Last edited by crconsulting; Sep 27, 2025 at 01:39 PM.
@W205C43PFLClearly a parasitic draw going on which is causing faults and destabilizing CanBus network. U016887 fault tied to sliding pano sunroof has come back once the battery went under 60%. I have managed to get the battery up to 83% by driving but it won't stay there. I suspect the alternator has limits.
Possible Multi-Fold. The Hermes module. 3G Telematics service was deprecated and the amplifier connection is preventing the fiber loop from closing..This fault keeps coming back every few months.
@crconsulting AnyScan A30 is a solid reader but you're correct, it's not sufficient here. An MB specific scanner. iCarsoft MB II or MB V3.0 should give me a reliable scan.
My Working Theories:
1. Module is stuck in transport mode because it lost its coding (past low-voltage event). Odds 30-40%.
2. Most likely, SOC lockout. It's likely restricted until the system sees stable charge cycles.
Parasitic Draw:
The MOST bus (media system fiber loop) (likely bigger drain) + telematics 3G causing the overall parasitic draw. MOST fault is intermittent which is explains why battery % is worse some weeks.
ACTION ITEMS:
1. Buy a better scanner
2. Charge Battery
3. Check amplifier connection as I'm getting speaker 1 connection.
4. Put on optical by pass loop but will pull fuse in interim..
OP, seems like other forum members had offered suggestions and I have nothing to add, good luck.
Update - Getting Closer to Taking Out The Vampire!
I got the 2025 LAUNCH Creader Elite V2.0 but I could locate transport mode. It has a lot of restrictions and the battery is too weak to
access certain modules just to read. I need the battery stronger and charger on..
It seems the 3G module is the vampire. Evidently the government sunset it but MB left people twisting in the wind.
Yes I could use the remote coder but he has min cost and equipment deposit which is too much for this small job.
Last edited by Nicholi2007; Oct 1, 2025 at 07:53 PM.
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