Is the transmission new? As far as the issue, this sounds like a few different things could be happening. First, if while driving the gear indicator goes to neutral by itself, that would likely be related to the transmission range sensor or a shift linkage adjustment issue. However, that doesn't explain the stalling at a stop.
When you come to a stop, does the engine feel loaded like a vehicle with a manual transmission would feel if the clutch wasn't depressed when stopping? If that is happening, it is likely related to the torque converter. Keep in mind, these are theories based on what you experienced and described. Please clarify the symptoms.
What I would suggest is to have the can-bus scanned to see if there are diagnostic trouble codes related to the issues. CAN stands for controller area network.
Basically, the different modules in the vehicle are tied together via a few wires. This type of scan will retrieve codes regardless of the module storing them.
Here is a link explaining how it's done:
I'm recommending this scan because otherwise, it becomes a guessing game based on theories. That can get expensive.
Also, if the transmission and engine are new, is there a warranty? Is the Cedia the same vehicle as the Lancer?
Let me know.
Monday, September 18th, 2023 AT 7:23 PM