Just got my new to me 2012 c250 but it has this P0068 MAP/Throttle correlation code that has been consuming me. I cleaned the throttle body which wasn’t really dirty along with the map sensor. And did some looking into my scanner data at idle AND at holding around 3000 rpms,does any of this stand out as to what could be the issue? For BARO/MAP reading purposes i’m 4400 ft above sea level. I’m not really noticing any symptoms other than its reluctance to speed up from 0 to like 25 mph other than that it drives and sounds fine. Not noticing any leaks either. Any help would be appreciated because i can’t seem to find the issue and im not real good with reading the data hence why i can send it attach photos with this. At idle my MAP kpa is 31 tps is at 10.2% and baro is at 86kpa
What makes this problem better or worse?
Worse when slowly accelerating 0-20 mph
How long has your 2012 Mercedes-Benz C250 had this problem?
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Hello, so, in Sparks Nevada are you 4400 feet above sea level? That's an important thought to consider. If you are - then at least the altitude from BARO is reading properly. If not, then that's a first concern to consider for running conditions and trouble codes.
"Cleaning" almost always does nothing.
The Mercedes Benz workshop manual does not regard or address code P0068. My guess is that a more specific Mercedes-Benz code is something that can be found using the proper diagnostic equipment to interface with a Mercedes-Benz versus a generic code reader.
As a result I would recommend getting some professional assistance from a shop near you that can help you drill down to Mercedes-Benz specific issues. You are flying blind otherwise.
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