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Old 09-21-2020, 08:25 PM
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Join Date: May 2007
Posts: 34
'04 C320 Transmission, will a 'Used' Gear Selector Unit 'Plug andd Play' w/o reset??

Code P0715 is the Only code...Auto-Transmission problem. This code usually means 'Oil trouble' but I'm quite sure I broke/shorted the gear selector unit. I had trouble moving the shift lever and noticed a piece of wire (glasses frame) had fallen under the boot into the gear shift selector unit. When I 'yanked' it out, she jerked and was stuck in 2nd...limp. I've heard that, on certain models, if you replace the 'gear shift selector unit' with a used one, 'With the Same Part #, it will Plug and Play without needing Re-programming. Am I one of the lucky models? I don't have codes from the TCU (don't have 'trans code' reader). I can't imagine what else it could be. Could I have 'shorted' another part? Do codes need to be cleared? I think I can clear the P0715 with the reader I have.

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Old 09-22-2020, 12:56 AM
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Join Date: May 2009
Location: The slums of Beverly Hills
Posts: 7,734
P0715 is generic something is wrong with your transmission. Yes it could be your gear selector or it could be something else. Only an MB specific code reader like icarsoft i980 or foxwell nt529 can tell you what's wrong. You could also simply clear the code and have it go back to normal. Hard to tell without appropriate code reader.

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