blueC230K

So I started up the car yesterday as usual. Shifted the gear to “R” and trying to back up. The car didn’t want to move so I try it with a little gas. It felt like something is stuck underneath the tire so I went to check and nothing was blocking all four tires. I tried again but no luck. I shifted to “D” and the car could move forward. Then I shifted back to “R” with more gas. The car hesitated for a little then there was this bang noise. It sounded like something is snapped. Nonetheless, the car can move backward and forward now. I am afraid to drive it now. I washed the car the day before and didn’t drive it since. Could it be the rust build up on the rotors?? I highly doubt it.
Talked to my tech last night and he wasn’t sure about this. All he could think of was the SBC brakes? I was thinking if it has anything to do with the gearbox/transmission/transfer case? I have a 2005 E500 4Matic. I don’t know
Please let me know if any of you guys have heard or experienced this. Thanks a lot!

SPNJHockey

My '07 has been into the shop a half dozen times because when I shift into reverse, ocassionally, the tranny delays a bit (sometimes, up to 7 seconds) before reverse gear engages. Every mechanic has been "unable to reproduce customer's complaint," therefore...no repairs, and the complaint continues. Same began at around 20k miles, and I'm at 52k now.

I recently got the extended warranty, so before 100k miles comes, they'll likely be replacing the entire thing for an approximate $9,000.

konigstiger

Speak with the shop foreman and "suggest" they flash and SCN code the transmission control unit (TCU) then reset adaptation for the reverse clutch.

SPNJHockey

Thanks, Cuz!

blueC230K

What about the "bang/snapped" noise that I was referring to? That got me worry.

blueC230K

Ok, it happened again yesterday. Same symptom. Is this like an annual thing?

Seriously, anyone has experienced this before?

clkwork

Scary. I had a Volvo S60 a long time ago with a similar problem (delay to reverse than a loud "clunk") but I traded it in before I discovered the cause.

BenzboyW210

No, never. The 'bang/snapped' sound you describe is worrying a bit. A 'clunk' or 'thud' could be an issue with the clutch slipping, or a worn flex disc, etc. However a sharp snapping sound likely means something else.

I would have a dealer look it over fully, scan for codes (active or dormant), change the transfer case oil (it's cheap). At least get it documented at a dealer in case it leads to something worse. Good luck!