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1st let me start by saying I did not open the door while the car was moving. All doors were checked and rechecked to be closed and locked.
Driving from Minnesota to Iowa. About 23 degrees f. Approximately 150 miles into the trip we stopped for a bio break. As I was coming to a stop at the bottom of the exit ramp, the car put itself in park and we skidded a few feet.
This happened under 5 mph. It continued to happen as we drove to the gas station, at each stop and then returning to the freeway.
Before returning home, we attended an event for a couple of hours. (so the car cooled down) Getting back into the car, we drove around town in IOWA and had no issues, coasting to several stops and then braking normally.
On the commute back to Minneapolis, we stopped again for a bio break after about 3 hours of driving. Again, when coming to a stop, once the car dropped below 5 mph, the car put itself in Park.
I searched the forums and have found this happening when people had the car in drive and opened the door. We tested that out in Iowa before returning. The "door open" warning light came on so I'm thinking that I've eliminated the possibility that the car thinks the drivers door is open because no such light comes on with my problem.
I put my scanner to the car this morning and no codes of any kind.
My wife's car so she will be calling the dealership on Monday but I'm hoping the collective intelligence of this group can point me to something.
FYI, the car has been owned by us since June, only driven locally until this weekend's road trip. Never had the issue previously.
Just a suspicion, but I'm wondering if the Auxiliary battery (or main battery) is getting a little on the weak side. I'd imagine if voltage drops, the system might drop into Park. Just shooting from the hip on this.
Just a suspicion, but I'm wondering if the Auxiliary battery (or main battery) is getting a little on the weak side. I'd imagine if voltage drops, the system might drop into Park. Just shooting from the hip on this.
Thank you for the reply and suggestion BeachBunny. I would have expected an error code but also would have expected it to happen regardless of a road trip. Of course there is the possibility that the road trip was just the beginning:-)
I'm unable to find a way to effectively "test" the battery but could certainly replace it, unless someone can recommend an effective load test how to?
Or possibly point me to the service document/ wiring diagrams for this battery?
If battery part 4040 is found dealer should replace it with 4039 at no cost due to poor/loose fit with terminal connector (reference C1A 100301) in addition, have dealer check Vehicle Master Inquiry (VMI) to confirm there are no outstanding service campaigns.
[QUOTE=konigstiger;6233342]If battery part 4040 is found dealer should replace it with 4039 at no cost due to poor/loose fit with terminal connector (reference C1A 100301) in addition, have dealer check Vehicle Master Inquiry (VMI) to confirm there are no outstanding service campaigns.
Thank you again. I did verify my car has gone through (serviced) 4 campaigns, but not this one. However, the SAM was serviced so I would guess the battery was inspected. I will check the battery and likely just replace it as they are cheap insurance. I'll wait until the weekend when hopefully the temp gets above freezing and will report back.
FYI, I've also been corresponding with another gent who experienced the same problem. Stumped the dealership and they ultimately replaced his EIS which he indicates solved his problem. I've yet to pull down the schematics and see how the backup battery ties to everything. Perhaps I can get that done this weekend if it's too cold to inspect the car.
Also, I drove the car around town today and was unable to replicate the problem so I've got that going for me:-)
Bulletin LI54.25-P-056472 “The key is not recognized in the electronic ignition switch, the vehicle cannot be started and/or the automatic transmission may perform an "Automatic P function" at speeds below 6 km/h.”, replace electronic ignition switch due to assembly issue - 212 clean point (problem corrected) as of VIN A776831.
Repair is covered under warranty, if out of warranty and below VIN A776831 bulletin will assist in obtaining MB goodwill assistance.
If Mercedes gives you any grief about paying for it, file a complaint with NHTSA. NHTSA was very helpful with the issues I had with Infiniti. The process is slow but I'm responsible for 3 of the recalls on my car.
A quick update. Took the car to the dealership Friday and they found the problem to be with the EIC and the ignition is on order. We have a loaner until the part comes in and is replaced today or tomorrow.
A quick update. Took the car to the dealership Friday and they found the problem to be with the EIC and the ignition is on order. We have a loaner until the part comes in and is replaced today or tomorrow.
I know I am reviving an old thread. But since this is my first post here, I thought someone could find it helpful.
I had the exact same issue with my 2010 E350 that I purchased at the end of November 2014. It WAS fixed by replacing the EIS (under CPO warranty) but the experience of car suddenly coming to a stop at an intersection showing the broad side to the oncoming traffic with my 3 kids in the back was scary.
I am in Ontario, Canada.
I just experienced this very issue with my 2012 E350 sedan. As I was slowing to a stop at a stop light, it just shifted into "P" right before I came to a complete stop.
Based on this thread, it looks like my best bet is to visit the dealer. Aside from telling them what happened and mentioning the EIS , is there anything else I should tell them to make sure this gets fixed right?
Just wanted to give another thank you to konigstiger and everyone else here.
The dealership just called and said they definitely need to replace the ignition switch and will do so. I think having the bulletin really helped to speed things up.
2015 GLK250
UPDATE 2018 - Key in electronic ignition switch (EZS) is not recognized, automatic transmission shifts to Park before vehicle comes to a stop.
Refer to Service Bulletin L154.25-P-056472_Ver_3 Complaint:
The key is not recognized in the electronic ignition switch, the vehicle cannot be started and/or the automatic transmission may go into Park at speeds below 6 km/h. Cause:
An assembly issue in the electronic ignition switch (EZS) results in a transition resistance at the diodes of the key detector. The key is detected as "not inserted" and may go into Park. Remedy:
Replace electronic ignition switch. Before replacing, perform the guided test of the drive authorization system!
It took the dealer 5 days to figure this out. Bring the Service Bulletin to them before you go in, so it doesn't take that long.
This website is a blessing!
Last edited by GLKFever; 04-20-2018 at 12:34 PM.
Reason: Insert my model & year
Hello, I am facing identical issues with my E350. Car slips into park randomly at very slow speeds. Additionally engine makes noises before slipping into park. Anyone else face identically issues with engine noises.
Hello, I am facing identical issues with my E350. Car slips into park randomly at very slow speeds. Additionally engine makes noises before slipping into park. Anyone else face identically issues with engine noises.
The thing that fixed mine was replacing the ignition switch.
Replacing the ignition switch repaired it from recurring; it was repaired under warranty after they replaced the Transmission neutral switch. Just emphasize that its the ignition switch.
Does anyone have the latest part number on the warranty? Please help ASAP. I have someone who is can program the old one, but I don't want to put the same part to fail again. The current old part number is 2129055800
Hey konigstiger i have been reading your posts to MB sites and i need your help now, i am having a W212 2012 year of production and the car puts itself into park at speed of 5-10 km/h, and same thing when car is in reverse and neutral can you Help me?
The problem is the ignition switch yesterday i have changed my eis and the problem has disappeared.Thanks to all of you guys for helping me and all of you who have the same problem go and change your EIS and the problem will be solved
11-16-2014, 08:26 AM
GLK250 - Car goes into Park by itself
