P167085 and P152700 codes
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2021 Mercedes-AMG C63 Coupe
P167085 and P152700 codes
The turbos on my 2021 C63 (M117.980 engine) keep dying. Shutting the car off and restarting fixes it for a while but then it happens again.
Finally got some DTCs:
P152700: "The check valve of the evaporative emission control system for cylinder bank 2 (at partial load) is jammed open."
P167085 "Calibration of the torque curve of the control unit has a malfunction. There is a signal above the permissible limit value."
Anyone have a clue how to resolve these?
Is the boost pressure solenoid possibly the problem? If so, is there a way to test it?
Thanks for any clues anyone can provide.
Finally got some DTCs:
P152700: "The check valve of the evaporative emission control system for cylinder bank 2 (at partial load) is jammed open."
P167085 "Calibration of the torque curve of the control unit has a malfunction. There is a signal above the permissible limit value."
Anyone have a clue how to resolve these?
Is the boost pressure solenoid possibly the problem? If so, is there a way to test it?
Thanks for any clues anyone can provide.
Newbie
Joined: Jan 2026
Posts: 6
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Having same issue
Hi, I’m currently having the same issue as of Jan 1 2026. Did you manage to solve the issue? I’m scratching my head at this and even my mechanic has no idea what’s happening. I replaced the purge valves and still have the code and loss of boost.
please let me know 🙏🏼
please let me know 🙏🏼
Thread Starter
Newbie
Joined: Mar 2024
Posts: 4
Likes: 1
2021 Mercedes-AMG C63 Coupe
I got many other codes before contacting them though: At one point I got P152700, P237700 and P012D00. A few weeks later I got just P012D00 and P012B2B.
A month after that it was P152700 and P012D00.
The changing codes were very confusing.
In the end, the P152700 code ("The check valve of the evaporative emission control system for cylinder bank 2 (at partial load) is jammed open") seemed to be the one that explained the problem because I replaced the evap purge line (which has a check valve in it), and the problem hasn't reoccurred in the 10 months since.
The part number for the evap purge line (left side) on my W205 C63 was A1770105308.
FWIW the Mercedes Xentry Parts Information db has been pretty helpful, and it's a "relatively" inexpensive subscription (at least compared to the other Xentry stuff).
Which purge valves did you replace?
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Joined: Jan 2026
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Yes, I did. I got a little help from JustAnswer.com. Sometimes you get a very knowledgeable tech through that service.
I got many other codes before contacting them though: At one point I got P152700, P237700 and P012D00. A few weeks later I got just P012D00 and P012B2B.
A month after that it was P152700 and P012D00.
The changing codes were very confusing.
In the end, the P152700 code ("The check valve of the evaporative emission control system for cylinder bank 2 (at partial load) is jammed open") seemed to be the one that explained the problem because I replaced the evap purge line (which has a check valve in it), and the problem hasn't reoccurred in the 10 months since.
The part number for the evap purge line (left side) on my W205 C63 was A1770105308.
FWIW the Mercedes Xentry Parts Information db has been pretty helpful, and it's a "relatively" inexpensive subscription (at least compared to the other Xentry stuff).
Which purge valves did you replace?
I got many other codes before contacting them though: At one point I got P152700, P237700 and P012D00. A few weeks later I got just P012D00 and P012B2B.
A month after that it was P152700 and P012D00.
The changing codes were very confusing.
In the end, the P152700 code ("The check valve of the evaporative emission control system for cylinder bank 2 (at partial load) is jammed open") seemed to be the one that explained the problem because I replaced the evap purge line (which has a check valve in it), and the problem hasn't reoccurred in the 10 months since.
The part number for the evap purge line (left side) on my W205 C63 was A1770105308.
FWIW the Mercedes Xentry Parts Information db has been pretty helpful, and it's a "relatively" inexpensive subscription (at least compared to the other Xentry stuff).
Which purge valves did you replace?
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