When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I don't want to speculate or suggest throwing parts at a problem, but I recall reading threads about this in the past that seemed to suggest a faulty pedal, such as this one:
Hello fellow m156 drivers, just wanted to share my experience to hopefully add value to the next driver down the line....
I had a P0222 Throttle/Pedal Position Sensor/Switch B Circuit Low code come on after I had removed my intake manifold to replace the PCV and add a catch can. I jumped to the forums to see if anyone had the same issue and one found a few people experiencing similar problems...
The consensus was to first get it properly diagnosed, but a few drivers installed new accelerator pedals or throttle bodies and had success.
Since I was really trying to do all my own maintenance I figured I could at least test the accelerator pedal theory by purchasing one (used $70 from ebay) and see if that made a difference.... Installed and welp... no difference.
Fearing I may have to replace/upgrade the TB, I stopped by my local indie shop to get hooked up to the STAR machine.... The reading was able to show there was a fault to ground one of the 4 plugs on the intake manifold. After removing the second or third plug we found an electrical pin had been bent when I pushed the plug together...
The tech straightened out the pin, and I earned the title at the shop of "hack of the day" haha.... fair enough.
After replacing spark plugs, fuel injectors, removing the intake manifold, replacing a PCV valve and adding a catch can as a DIY MB World and YouTube mechanic, I am really happy that a bent pin was my only issue.
Long story short, check the pins on electrical plugs on the front of the manifold before buying parts or causing a few laughs at your local shop!
Just chipping in my experience here, on a drive out I received a traction control system inoperable and a tyre pressure system warning when the car then went into limp mode.
Restarting the car then just left the engine management light on. Then, after a day it would clear… however, as soon as you drove and hit the bottom button on the pedal (kick down) all these lights would come back and limp mode would kick in again. After plugging in a code reader it read P2123.
The Mercedes STAR procedure is to first cleanup the throttle pedal connectors. This however did not work for me, so I replaced the throttle
pedal for £170 (Thanks to Mercedes of Newcastle) and fitted it myself.
All good so far!
Installed my catch can yesterday and the P2123 code popped up. I was wondering if any of y’all know where the throttle/pedal wiring is? I took out all the sensors I touched and checked/clean them but no difference.
Curry, check the 4 plugs on the front of the intake manifold. Ensure they are all seated and no pins are bent. I think it is the second plug from the passenger side. Good luck!
Hello fellow m156 drivers, just wanted to share my experience to hopefully add value to the next driver down the line....
I had a P0222 Throttle/Pedal Position Sensor/Switch B Circuit Low code come on after I had removed my intake manifold to replace the PCV and add a catch can. I jumped to the forums to see if anyone had the same issue and one found a few people experiencing similar problems...
The consensus was to first get it properly diagnosed, but a few drivers installed new accelerator pedals or throttle bodies and had success.
Since I was really trying to do all my own maintenance I figured I could at least test the accelerator pedal theory by purchasing one (used $70 from ebay) and see if that made a difference.... Installed and welp... no difference.
Fearing I may have to replace/upgrade the TB, I stopped by my local indie shop to get hooked up to the STAR machine.... The reading was able to show there was a fault to ground one of the 4 plugs on the intake manifold. After removing the second or third plug we found an electrical pin had been bent when I pushed the plug together...
The tech straightened out the pin, and I earned the title at the shop of "hack of the day" haha.... fair enough.
After replacing spark plugs, fuel injectors, removing the intake manifold, replacing a PCV valve and adding a catch can as a DIY MB World and YouTube mechanic, I am really happy that a bent pin was my only issue.
Long story short, check the pins on electrical plugs on the front of the manifold before buying parts or causing a few laughs at your local shop!
-C63Dave
I have the same problem p0222. I did check the plug but it's all good. I changed the pedal, throttle bodies and ecu and still throw a code. Mercedes checked all my wiring and it's all good. Pedal is a good and throttle body is good. I don't know what else to check. I've spent $4k and still nothing. I do have a tune stage 2. Buti put it back to stock file and still same code p0222 shows up.
2008 MB C350 4MATIC/2011 CL63 AMG/2014 C63 Coupe 507
Thoughts would be (as mentioned above as well), TBs / Accel. pedal / TB cable that sits under the manifold. Beyond that is beyond my knowledge.
I am chasing an issue on my Supercharged car where when i WOT it, the car 'redlines' at 5500 RPMs, and no CEL. however if WOT in lower gears, it follows up by limp mode and malfunction codes. Ive tried TBs, used accel pedal, tunes; no joy. Sitting with a broken SC belt that wont allign at the moment. (enough of my mini vent haha)
Curry, check the 4 plugs on the front of the intake manifold. Ensure they are all seated and no pins are bent. I think it is the second plug from the passenger side. Good luck!
hey bro,
Do you know what pin was bent? I still cant fix my p0222 error. I brought a new pedal and that didnt work. I installed 2 throttle bodies... that didnt work. I installed new ecu.. that didnt work. I did find the wires was showing bare copper. So I cut and re crimped it. So didnt work. I'm running ing out of ideas. I'm thinking of tapping the wires from my switch A plug and tap it Into my switch B plug. Pin 6 which is the signal wire.
if you can tell me which number pin was bent on yours that would be great.
Thanks
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
