New member here. Just got CPO 2013 GLK350, already have some issues
The other issue is the RPM. The tach needle bounces slightly up and down on idle. I will post a video of this later.
Finally, there are times when the car is re-started after its warm and the engine sounds like a diesel truck for a few seconds then goes away. Should this be a concern?

Sounding like a diesel is not uncommon for direct injection.
hold the button for the steering wheel either up or down for like 30 seconds and it should work again. see if that works, mine was stuck and just started working after doing that.
for the engine noise, I've had the same prob since my 2013 was new and the dealer can never duplicate it. it's either a lifter problem or a loose pulley only when the car is restarted sometimes. there a thread here:
https://mbworld.org/forums/glk-class...old-start.html
my car's due for service in Jan so i'm just going to show the SA that thread
hold the button for the steering wheel either up or down for like 30 seconds and it should work again. see if that works, mine was stuck and just started working after doing that.
for the engine noise, I've had the same prob since my 2013 was new and the dealer can never duplicate it. it's either a lifter problem or a loose pulley only when the car is restarted sometimes. there a thread here:
https://mbworld.org/forums/glk-class...old-start.html
my car's due for service in Jan so i'm just going to show the SA that thread
I think that all forum members need to post a complaint on NHTSA web site as a safety issue due to the misalignment of the air bag and a safe driving position.
Here are the links -
http://https://mbworld.org/forums/audio-electronics/201439-how-fix-power-steering-column-will-not-move-up-down.html#post2316091
https://mbworld.org/forums/c-class-w...d-working.html
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I think that all forum members need to post a complaint on NHTSA web site as a safety issue due to the misalignment of the air bag and a safe driving position.
Here are the links -
http://https://mbworld.org/forums/audio-electronics/201439-how-fix-power-steering-column-will-not-move-up-down.html#post2316091
https://mbworld.org/forums/c-class-w...d-working.html
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The telescoping mechanism for steering wheel broke. It is replaced.
The loud rattle I hear sometimes in the engine compartment is due to a slack in the secondary chain tensioners. The tensioner was replaced.
The RPM needle bouncing up and down didn't show any codes but they think it may have to do with the chain or tensioner. They are checking that right now before car will be released.
I did that already and that didn't fix it. It's been in the dealer now for third day. They gave us another GLK350 for a loaner car. They finally called this afternoon and addressed the following issues I complained about:
The telescoping mechanism for steering wheel broke. It is replaced.
The loud rattle I hear sometimes in the engine compartment is due to a slack in the secondary chain tensioners. The tensioner was replaced.
The RPM needle bouncing up and down didn't show any codes but they think it may have to do with the chain or tensioner. They are checking that right now before car will be released.
Rattle noise on startup:
Replaced chain tensioner and related parts.
Steering wheel doesn't go up or down anymore:
Replaced mechanism.
Fluctuating or bouncing RPM needle:
Software flash for the instrument panel.
The CPO (and extended) warranty are both unlimited miles.


