2016 C300 Crankcase Ventilation System OOPS!
Thread Starter
Junior Member
Joined: Jun 2019
Posts: 19
Likes: 5
1998 SL 500
2016 C300 Crankcase Ventilation System OOPS!
I am at my wit's end here. Mine is a 2016 C300 that had the dreaded check engine light. It gave me the PCV code and after reading a lot of posts and videos on YouTube, I decided that I could get away with just changing the bleed valve which I did. It wasn't the hardest job and indeed was much easier than replacing the entire set of hoses. Once I had everything put back together, i tried to crank it up and lo and behold, it cranks but will not start. I have the pic of a car skidding and unavailable, see manual. I have almost more error codes than Carter has little Liver pills. They are:
P0193 Fuel Rail Fuel Pressure Sensor High;
P24D8 Evap System Pressure Sensor / Switch B Circuit High.
P1190 Sensor Intake air pressure has a short circuit to positive;
P0238 Turbo/Supercharger Boost Sensor A Circuit High;
P0107 Manifold Absolute Pressure / BARO sensor low input;
P04DB Crankcase Ventilation System Disconnected;
P007D Charge air cooler temperature Sensor circuit high bank 1;
P0098 Intake Sir Temperature 2;
P0183 Fuel Temperature Sensor A circuit high input;
P052E PCV Reg Valve Performance
Everything worked before I changed out the bleed line valve to hopefully correct the PCV problem. After I tried and got all of this, I took it apart and checked all connectors, made sure they were seated properly and that I did not miss one. So I am now looking for some common thing that will cause all of this and prevent the engine from firing off. I am most concerned about the P04DB, Crankcase Ventilation System Disconnected. but don't have a clue what to do next. Any guidance will be most appreciated here. HELP!
P0193 Fuel Rail Fuel Pressure Sensor High;
P24D8 Evap System Pressure Sensor / Switch B Circuit High.
P1190 Sensor Intake air pressure has a short circuit to positive;
P0238 Turbo/Supercharger Boost Sensor A Circuit High;
P0107 Manifold Absolute Pressure / BARO sensor low input;
P04DB Crankcase Ventilation System Disconnected;
P007D Charge air cooler temperature Sensor circuit high bank 1;
P0098 Intake Sir Temperature 2;
P0183 Fuel Temperature Sensor A circuit high input;
P052E PCV Reg Valve Performance
Everything worked before I changed out the bleed line valve to hopefully correct the PCV problem. After I tried and got all of this, I took it apart and checked all connectors, made sure they were seated properly and that I did not miss one. So I am now looking for some common thing that will cause all of this and prevent the engine from firing off. I am most concerned about the P04DB, Crankcase Ventilation System Disconnected. but don't have a clue what to do next. Any guidance will be most appreciated here. HELP!
Out Of Control!!
Joined: Sep 2018
Posts: 14,680
Likes: 4,579
From: unbegrenzt
2017 GLE350 4MATIC
I am at my wit's end here. Mine is a 2016 C300 that had the dreaded check engine light. It gave me the PCV code and after reading a lot of posts and videos on YouTube, I decided that I could get away with just changing the bleed valve which I did. It wasn't the hardest job and indeed was much easier than replacing the entire set of hoses. Once I had everything put back together, i tried to crank it up and lo and behold, it cranks but will not start. I have the pic of a car skidding and unavailable, see manual. I have almost more error codes than Carter has little Liver pills. They are:
P0193 Fuel Rail Fuel Pressure Sensor High;
P24D8 Evap System Pressure Sensor / Switch B Circuit High.
P1190 Sensor Intake air pressure has a short circuit to positive;
P0238 Turbo/Supercharger Boost Sensor A Circuit High;
P0107 Manifold Absolute Pressure / BARO sensor low input;
P04DB Crankcase Ventilation System Disconnected;
P007D Charge air cooler temperature Sensor circuit high bank 1;
P0098 Intake Sir Temperature 2;
P0183 Fuel Temperature Sensor A circuit high input;
P052E PCV Reg Valve Performance
Everything worked before I changed out the bleed line valve to hopefully correct the PCV problem. After I tried and got all of this, I took it apart and checked all connectors, made sure they were seated properly and that I did not miss one. So I am now looking for some common thing that will cause all of this and prevent the engine from firing off. I am most concerned about the P04DB, Crankcase Ventilation System Disconnected. but don't have a clue what to do next. Any guidance will be most appreciated here. HELP!
P0193 Fuel Rail Fuel Pressure Sensor High;
P24D8 Evap System Pressure Sensor / Switch B Circuit High.
P1190 Sensor Intake air pressure has a short circuit to positive;
P0238 Turbo/Supercharger Boost Sensor A Circuit High;
P0107 Manifold Absolute Pressure / BARO sensor low input;
P04DB Crankcase Ventilation System Disconnected;
P007D Charge air cooler temperature Sensor circuit high bank 1;
P0098 Intake Sir Temperature 2;
P0183 Fuel Temperature Sensor A circuit high input;
P052E PCV Reg Valve Performance
Everything worked before I changed out the bleed line valve to hopefully correct the PCV problem. After I tried and got all of this, I took it apart and checked all connectors, made sure they were seated properly and that I did not miss one. So I am now looking for some common thing that will cause all of this and prevent the engine from firing off. I am most concerned about the P04DB, Crankcase Ventilation System Disconnected. but don't have a clue what to do next. Any guidance will be most appreciated here. HELP!
If no joy then replace main battery and voltage converter. Lots of sudden unexplained codes is a classic indication of old battery.
Thread Starter
Junior Member
Joined: Jun 2019
Posts: 19
Likes: 5
1998 SL 500
Things Chainged
P0193 Fuel rail Pressure sensor high input.
P2137 Throttle / Pedal position sensor a circuit high input
P0123 Throttle/Pedal position sensor A Circuit High input
P0222 Throttle / Pedal position sensor B circuit low input
P1190 Sensor "intake air pressure" has a short circuit to positive
P0238 Turbo/Super charger boost sensor A circuit high
P0108 Manifold Absolute pressure / BARO Sensor high input (this one changed from low to high)
P0183 Fuel Temperature sensor A circuit high input
P0030 Heater control bank 1 sensor 1
P052E Positive crankcase ventilation regulator valve performance
My thoughts tend to ask if there is a common connector for these signals that might be messed up? Or is there a particular fuse that feeds these signals? If so where is it? Someone removed the fuse layout from each fusebox so I am not sure of much there except to pull each one and check it. A fuse layout would be nice if anyone can share. And the worst of all, is it possible that while unplugging and replugging that somehow I managed to damage the controller?
Out Of Control!!
Joined: Sep 2018
Posts: 14,680
Likes: 4,579
From: unbegrenzt
2017 GLE350 4MATIC
Something is not right (you knew that).
I think W205 has a voltage converter (capacitor). Search this site and google for it, and replace it. It is analogous to an auxiliary battery on other MBs. Replace it even if you don't have a code for it. MB electrical systems need nearly perfect batteries and aux batteries/voltage converters.
You have a fairly long list of unrelated codes. Something is wrong in the electrical system. Retrace your work. Look for blown fuses.
Aux battery start here: https://mbworld.org/forums/c-class-coupe-c205/785939-auxiliary-battery-malfunction.html
https://youtu.be/38ahGoCzHLA
I think W205 has a voltage converter (capacitor). Search this site and google for it, and replace it. It is analogous to an auxiliary battery on other MBs. Replace it even if you don't have a code for it. MB electrical systems need nearly perfect batteries and aux batteries/voltage converters.
You have a fairly long list of unrelated codes. Something is wrong in the electrical system. Retrace your work. Look for blown fuses.
Aux battery start here: https://mbworld.org/forums/c-class-coupe-c205/785939-auxiliary-battery-malfunction.html
https://youtu.be/38ahGoCzHLA
Last edited by chassis; Aug 21, 2023 at 09:45 PM.
Thread Starter
Junior Member
Joined: Jun 2019
Posts: 19
Likes: 5
1998 SL 500
Here is a different symptom. I took the connectors off of the ECM and reseated them. The list changed yet again. Some the same but several different ones. The cable bundle for the larger connector runs by the valve I changed. And it is tight with no slack while the smaller connector has lots of slack. Thoughts from that?
Senior Member
Joined: Feb 2018
Posts: 333
Likes: 102
2019 CLS450 (C257)
Well, the battery was bad. It wouldn't charge beyond 55% and 9 volts. It was in warranty so I got a new one and things changed, It still cranks but won't start. Now the error messages are:
P0193 Fuel rail Pressure sensor high input.
P2137 Throttle / Pedal position sensor a circuit high input
P0123 Throttle/Pedal position sensor A Circuit High input
P0222 Throttle / Pedal position sensor B circuit low input
P1190 Sensor "intake air pressure" has a short circuit to positive
P0238 Turbo/Super charger boost sensor A circuit high
P0108 Manifold Absolute pressure / BARO Sensor high input (this one changed from low to high)
P0183 Fuel Temperature sensor A circuit high input
P0030 Heater control bank 1 sensor 1
P052E Positive crankcase ventilation regulator valve performance
My thoughts tend to ask if there is a common connector for these signals that might be messed up? Or is there a particular fuse that feeds these signals? If so where is it? Someone removed the fuse layout from each fusebox so I am not sure of much there except to pull each one and check it. A fuse layout would be nice if anyone can share. And the worst of all, is it possible that while unplugging and replugging that somehow I managed to damage the controller?
P0193 Fuel rail Pressure sensor high input.
P2137 Throttle / Pedal position sensor a circuit high input
P0123 Throttle/Pedal position sensor A Circuit High input
P0222 Throttle / Pedal position sensor B circuit low input
P1190 Sensor "intake air pressure" has a short circuit to positive
P0238 Turbo/Super charger boost sensor A circuit high
P0108 Manifold Absolute pressure / BARO Sensor high input (this one changed from low to high)
P0183 Fuel Temperature sensor A circuit high input
P0030 Heater control bank 1 sensor 1
P052E Positive crankcase ventilation regulator valve performance
My thoughts tend to ask if there is a common connector for these signals that might be messed up? Or is there a particular fuse that feeds these signals? If so where is it? Someone removed the fuse layout from each fusebox so I am not sure of much there except to pull each one and check it. A fuse layout would be nice if anyone can share. And the worst of all, is it possible that while unplugging and replugging that somehow I managed to damage the controller?
My friend's C had very similar issues... multiple codes relating to circuitry; either high or low or open.
Eventually after months of troubleshooting and hardware replacement, we solved it with the replacement of this relay.
This may/may not work for you, but it's not an expensive part to replace so its up to you to give it a try.
Last edited by dagger22; Aug 21, 2023 at 10:45 PM.
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Out Of Control!!
Joined: Sep 2018
Posts: 14,680
Likes: 4,579
From: unbegrenzt
2017 GLE350 4MATIC
Here is a different symptom. I took the connectors off of the ECM and reseated them. The list changed yet again. Some the same but several different ones. The cable bundle for the larger connector runs by the valve I changed. And it is tight with no slack while the smaller connector has lots of slack. Thoughts from that?
Also check for oil in the cam magnets and cam position sensors. This may be a peripheral problem, but you have not nailed things down yet so no harm in spending 10 minutes opening the cam sensor and magnet connectors to check them.
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Thread Starter
Junior Member
Joined: Jun 2019
Posts: 19
Likes: 5
1998 SL 500
Problem Solved
Your battery and aux battery are no good. The electrical system is all over the map.
Also check for oil in the cam magnets and cam position sensors. This may be a peripheral problem, but you have not nailed things down yet so no harm in spending 10 minutes opening the cam sensor and magnet connectors to check them.
Also check for oil in the cam magnets and cam position sensors. This may be a peripheral problem, but you have not nailed things down yet so no harm in spending 10 minutes opening the cam sensor and magnet connectors to check them.
