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Very strange thing is happening to with the car since the summer months.When the interior is warm (now in winter too) the car goes to P when she wants to even when moving slow.After going into P it can't switch to N ,R or D - left me standed the middle of an intersection one time.No fault codes found.The gearbox is 7-gtronic i don't the know exact model of the gearbox.
When we scanned the car it didn't show any fault codes also there is no second battery.No warnings for open door too.Will test the sensors when i got the car (im away from home).
If your car is a '10-'13, you have a second battery in the dash, you access it through the side panel on the drivers side of the dash. It is the size of an alarm system battery, all it does in those model years is enable you to shift the car when the main battery dies.
If it's this battery shouldn't i get a warning for it ? Like battery malfunction/fail something like that.
Yes, Auxiliary battery warning on dash, but I never heard of that influencing the car shifting to park, as Cali said, it could be one of your door sensors, maybe clean and lube those to be sure, might be stuck? do the interior lights come on when yo open each door?
It might not be enough to trigger the door ajar light, but enough to throw the transmission into park? The car will go into park if you open the door while moving, I believe under 5 MPH. I do remember reading a thread about this on the forum, I don't remember if it was the conductor plate in the transmission.
Is your shifter on the stalk working well, it's not sticking or stopping part way?
Last edited by pierrejoliat; 01-30-2022 at 08:37 AM.
Yes, Auxiliary battery warning on dash, but I never heard of that influencing the car shifting to park, as Cali said, it could be one of your door sensors, maybe clean and lube those to be sure, might be stuck? do the interior lights come on when yo open each door?
It might not be enough to trigger the door ajar light, but enough to throw the transmission into park? The car will go into park if you open the door while moving, I believe under 5 MPH. I do remember reading a thread about this on the forum, I don't remember if it was the conductor plate in the transmission.
Is your shifter on the stalk working well, it's not sticking or stopping part way?
it's not sticking nor stoping.Where are the sensors located and how they look so i can find them? No warning or indication on the dash for this battery.Also i talked to the previous owner and he said he replaced it.
If within affected range (VIN is below a776831) ignition switch may need replacement. If not under warranty one can argue for MB goodwill repair given bulletin documents “assembly issue”, defective switch was installed during production.
When, my main battery took a crap 3 years ago, the AUX battery was in charge of keeping anything mounted to the steering wheel powered including the electronic shifter. It would not get out of P after replacing the main battery, and I though it left me stranded. I let the car on for a while with rev at 2000, then powered off, waited 5 minutes then I started the car, and was able to shift. There was no AUX battery malfunction message either. Batteries hate cold weather, and they will do all sorts of crazy things.
A battery tender is a must for this weather, even for me in Florida.
When, my main battery took a crap 3 years ago, the AUX battery was in charge of keeping anything mounted to the steering wheel powered including the electronic shifter. It would not get out of P after replacing the main battery, and I though it left me stranded. I let the car on for a while with rev at 2000, then powered off, waited 5 minutes then I started the car, and was able to shift. There was no AUX battery malfunction message either. Batteries hate cold weather, and they will do all sorts of crazy things.
A battery tender is a must for this weather, even for me in Florida.
but my go in P and after that it won't to to R ,N or D .I know that batteries hate cold but this is happening when the cabin is warm in summer months ot when the heating is on.
If within affected range (VIN is below a776831) ignition switch may need replacement. If not under warranty one can argue for MB goodwill repair given bulletin documents “assembly issue”, defective switch was installed during production.
So the Vin after the A is not the same as in the bulletin for W212 and this means this car is affected by it.But how can i be sure because changing working parts with others parts its expensive and time consuming
it's not sticking nor stoping.Where are the sensors located and how they look so i can find them? No warning or indication on the dash for this battery.Also i talked to the previous owner and he said he replaced it.
They are integrated into the door handle latch mechanisms, I wanted you to check this so it could be ruled out. Does the interior light work when opening each door individually? If the dash warning for auxiliary battery didn't come on, then it's likely not involved in this issue, if it's been changed, less likely. If it's the ignition switch, it should have thrown a fault code of some kind I believe. But Ive been on the forum for a decade and Koenigstiger hasn't been wrong yet.
The pickle is datagram must go through CAN's and Gateways to reach TCU. Modules are not connected directly.
The question is what in your car makes TCU decide to go from D to P?
Hands-on:
Since you report no error are logged, then exercice each suspect module to test/find a matching issue by looking at live data.
There are a dozen modules on the bus including InstCluster, F-SAM, ECU... that can create your problem.
In addition to input modules that were mentioned earlier, how about your gear selector?
Use live data from your scanner or a Xentry to get full exposure.
So in the summer i visited the official MB dealer in my country .They said the car has "electrical problem" and nothing more (they have their secrets).They said the gear selector and the whole assembly need to be changed.When i got back i will try to replicate the issue and monitor the live data.
VIN is within bulletin affected range, not certain how bulletin will be received in your market. Here are EIS (bulletin) & column module (dealer recommendation) part #s.
Last edited by konigstiger; 01-31-2022 at 12:05 PM.
VIN is within bulletin affected range, not certain how bulletin will be received in your market. Here are EIS (bulletin) & column module (dealer recommendation) part #s.
thank you for this information .Why the car doesn't throw error codes/messages ? This an electronic fault logically it show show something.
01-27-2022, 02:35 PM
