C8 Error Code P2855
Thread Starter
7th Gear
Joined: Aug 2021
Posts: 7
Likes: 0
C8 Error Code P2855
Hey everyone,
I started up my 2021 C8 today and saw the engine warning light. I called On Star and they said it was error code TCM Transmission System P2855. My car only has 1,986 miles on it! It was running funny (felt like loss of power at times) and another warning light came on saying something about no engine creep available? Disappointed and frustrated to say the least! I will hopefully be able to get it into the dealer this week but of course they are slammed.
Has anyone else experienced this? If so what was the fix? My dealer said it may need a new transmission?? HELP
I started up my 2021 C8 today and saw the engine warning light. I called On Star and they said it was error code TCM Transmission System P2855. My car only has 1,986 miles on it! It was running funny (felt like loss of power at times) and another warning light came on saying something about no engine creep available? Disappointed and frustrated to say the least! I will hopefully be able to get it into the dealer this week but of course they are slammed.
Has anyone else experienced this? If so what was the fix? My dealer said it may need a new transmission?? HELP
Safety Car
Joined: Jul 2013
Posts: 4,408
Likes: 3,485
From: Granada Hills CA
In early October '21 I had a similar Idle Creep Message, CEL [check engine light] and codes P0776 & P2854 at under 400 miles. Later that day the CEL went off and the codes cleared. With almost 3,500 miles driven since, the problem has not returned. After seeing a few posts on the Forum about this issue, I decided to wait until the 7,500 transmission filter change and make sure that the dealer performs the transmission service cleaning procedure. Apparently microscopic debris can hinder one of the internal solenoids, triggering the CEL. My problem seems to have cured itself.
Burning Brakes
Joined: Mar 2011
Posts: 1,208
Likes: 320
From: “Out there”
I too had the “Idle Creep Message, CEL [check engine light]” come on a few times. It seemed to correct itself for awhile, but happened again, twice. So I took it in to the dealer, and they cleared the codes. But after doing it again, took it in and set up a service appointment. Tech is skipping the flush, and going straight to a valve body replacement. Sounds good, but I’ve been waiting a month now for the part. Not too bad though, being winter in Wisconsin.
My story:
https://www.corvetteforum.com/forums...on-update.html
My story:
https://www.corvetteforum.com/forums...on-update.html
Moderator
Joined: Feb 2006
Posts: 39,066
Likes: 17,932
From: DFW Area TX
From the service manual:
P2855
B12BA Transmission Fluid Pressure Sensor 1 = Greater than a predefined threshold
Actions Taken When the DTC Sets
DTCs listed in the DTC Descriptor Category = Type A> DTC
Transmission Creep Mode = Disabled
Clutch 1> / Odd Clutch = Disabled
B12BA Transmission Fluid Pressure Sensor 1 = Greater than a predefined threshold
Actions Taken When the DTC Sets
DTCs listed in the DTC Descriptor Category = Type A> DTC
Transmission Creep Mode = Disabled
Clutch 1> / Odd Clutch = Disabled
Melting Slicks
Joined: May 2011
Posts: 2,072
Likes: 462
From: Lincoln, CA.
My check engine light came on. It was the engine/transmission solenoid. It couldn’t regulate the pressure between the engine and transmission because the transmission filter was clogged with microscopic debris. The dealership did a complete flush of the system as per GM’s fix. I was told that GM has instructed all dealerships to do a complete flush when a C8 comes in for its 7500 mile oil change.
