Date registered: Sep 2006
Vehicle: 2004 CLK 240 Coupe
Location: Norfolk. UK
Mentioned: 9 Post(s)
Quoted: 341 Post(s)
sean - Welcome to BW.
Please complete your profile with User CP as you model/year location often helps with answers here. Also work out which forum to use, as there will be one for your model. There is no model CD 220 CDI. It is either a CLK 220 CDI which is a W209, or a C220 CDI which is a W203.
Also please remember that most readers here are in the US, and have no idea how to read a UK number plate to know your year of manufacture.
About your transmission. I do not know what transmission you have. MB offered two types of automatic transmission around that time - the 5-speed 722.6, and the 7-speed 722.9.
The 5-speed can be topped up with ATF via the dipstick tube. The 7-speed cannot, and the procedure is done from under the car, using a special filler.
As ATF is not normally consumed (as is engine oil) MB decided that there is no need on all their transmissions for a level indicator/warning light.
What make you think that you have lost ATF? Any signs of it on the transmission pan? What is your mileage? Has the ATF ever been changed?
About limp-home mode, it generally signifies a transmission 'control' problem, (ie, shift plate) but we recently had a post here from a CDI diesel owner that has this fault associated (indirectly) with a blocked dpf. Ever had a problem with that?