Firstly, this is for a 2014 Mercedes Cla 45 amg not a 250 (the 45 wasn't available in drop down but they are a similar car/engine).
Initially I had a check engine light on for a clogged crankcase vent valve (which I initially read was under the front driver side axle). So, since I was removing the axle to access that vent valve, I decided to replace the axle, control arm, suspension stabilizer bar, and tie rod end while I was in there. I ended up figuring out the vent valve wasn’t down there but figured out where it was and replaced it. I also removed the old downpipe/cat and replaced that with a new one including two new 02 sensors. I also removed the radiator to allow more room to work and ended up replacing that as well since I had it out and it was the original one. During that time I also took the bumper off to access the radiator hoses and such.
Got it all back together and started to drive down the driveway and the Fail Safe warning lights came on with all kinds of codes and it wouldn’t go into any gear. I have a Foxwell OBD reader so, after accessing the initial codes, it seemed to possibly be the wheel speed sensor was acting up so, I just installed a new one of those but the same thing happened after reassembly.
These are my current codes and mind you, I did not have anything wrong with this besides the code for the vent valve being clogged. Codes have been cleared multiple times and battery has been unhooked multiple different times during all of this as well.
P261029 The engine off time has an implausible value.
U010187 Communication with control unit “transmission” has a malfunction
U010387 Communication with the electronic selector lever module has a malfunction.
061B00 The torque calculation of the control unit has a malfunction
079200 RPM sensor 1 has a malfunction
D40D64 An implausible wheel speed signal was received
C10287 Communication with the transfer case has a malfunction
C06A600 No Can message was received from control unit “engine”
C037100 No Can message was received from control unit “transmission”
C054100 No Can message was received from control unit “shift module”
C06A300 The Can message from control unit “Engine” is faulty
U010100 Communication with control unit “Transmission” has a malfunction
U040186 Implausible date were received from control unit “combustion engine”
U010087 Communication with the control unit “combustion engine” has a malfunction
U119800 No Can message was received from control unit “A80”
Any suggestions would be greatly appreciated!
Thanks, Jeremy
Initially I had a check engine light on for a clogged crankcase vent valve (which I initially read was under the front driver side axle). So, since I was removing the axle to access that vent valve, I decided to replace the axle, control arm, suspension stabilizer bar, and tie rod end while I was in there. I ended up figuring out the vent valve wasn’t down there but figured out where it was and replaced it. I also removed the old downpipe/cat and replaced that with a new one including two new 02 sensors. I also removed the radiator to allow more room to work and ended up replacing that as well since I had it out and it was the original one. During that time I also took the bumper off to access the radiator hoses and such.
Got it all back together and started to drive down the driveway and the Fail Safe warning lights came on with all kinds of codes and it wouldn’t go into any gear. I have a Foxwell OBD reader so, after accessing the initial codes, it seemed to possibly be the wheel speed sensor was acting up so, I just installed a new one of those but the same thing happened after reassembly.
These are my current codes and mind you, I did not have anything wrong with this besides the code for the vent valve being clogged. Codes have been cleared multiple times and battery has been unhooked multiple different times during all of this as well.
P261029 The engine off time has an implausible value.
U010187 Communication with control unit “transmission” has a malfunction
U010387 Communication with the electronic selector lever module has a malfunction.
061B00 The torque calculation of the control unit has a malfunction
079200 RPM sensor 1 has a malfunction
D40D64 An implausible wheel speed signal was received
C10287 Communication with the transfer case has a malfunction
C06A600 No Can message was received from control unit “engine”
C037100 No Can message was received from control unit “transmission”
C054100 No Can message was received from control unit “shift module”
C06A300 The Can message from control unit “Engine” is faulty
U010100 Communication with control unit “Transmission” has a malfunction
U040186 Implausible date were received from control unit “combustion engine”
U010087 Communication with the control unit “combustion engine” has a malfunction
U119800 No Can message was received from control unit “A80”
Any suggestions would be greatly appreciated!
Thanks, Jeremy
Aug 20, 2025 at 3:12 PM
