My 2009 CLK was parked for a couple of years due to the deterioration of road surfaces in my Third World backwater which made driving a chore, due to the low ground clearance of this car. A recent resurfacing of the local road surfaces was my cue to bring the CLK out of hibernation, and that was when I encountered a slew of problems all most likely related to the lack of use the vehicle saw for an extended period of time.

Cutting to the chase, the frequent stalling of the car was traced to blocked fuel lines and dirty fuel filters, while the transmission's sudden failure to engage either forward or reverse gears was partially solved by replacing the transmission fluid and filter. Now a more intractable problem has popped up and defied resolution thus far, hence this post after a long hiatus from visiting this forum. The transmission downshifts with an alarming clunk THRICE in rapid succession every time I slow down to a stop at an intersection or sped-bump. Similarly, the gear shifts that used to be imperceptibly smooth during acceleration in the past, are now disconcertingly violent and jarring, which makes the ride decidedly uncomfortable.

An auto electrician that I initially hired to work on the car evidently sabotaged the car by monkeying with the fuse box in the trunk and randomly disconnecting wire harness plugs from their sockets, all of which have been discovered and reconnected by a more trusted auto electrician that I hired to remedy the deliberate damage wrought by the last electrician that got showed the door a tad too late. I am writing to see whether the violent clunking shift of this transmission might sound familiar to any of the Mercedes gurus that hold court in this forum. Any pointers that can be offered would be enormously appreciated because I am certain that driving this car in its current state would be disastrous in the long run, given the jarring nature of the car's transmission shifts. Thanks in advance good sirs. Standing by to her from the Oracle.

hello, i suggest a full washing of gearbox, not only change oil or filter beacuse can be deposit of oil in the little passages, propbably some lectric valve in the gearbox is stuck. I suggest a full service on gearbox and cleaning.

A full dismantling and spring clean of the transmission sounds like a procedure that is fraught with perils, especially given the caliber of mechanics in my neck of the woods. I can just visualize my CLK's transmission spread out across a grimy shop floor. I am hoping that this route is not the final recourse that becomes unavoidable.

I'd been hoping to hear that perhaps simply driving the car along country roads for a couple of hours might smooth things out. This reply is nonetheless appreciated all the same. I'm still waiting to hear about any late discoveries from the auto-electrician who is still suspecting that the deliberate sabotage of the car's wiring may be the cause of this anomaly. I'll file further dispatches here as events unfold, but will also stay tuned to this forum in case any other considerations are mentioned.

i know the complete servicing of the transmission sound not good, but if you drive you could damage the driveshaft or differential from hard shifting, automatic gearbox i think yours is the 5G is well bulid and durable. Maybe they don't put the correct transmission oil, or another common error is only change the oil that is in the cup and the onre that rest in the circuit of the gear never got changed and when the car shift the old oil contaminate the new oil

TCU Reset first. Then do a complete service of the transmission.