P2788 means an issue with the adaptive learning system of the transmission which may cause harsh idling, poor shifting and transmission overheating. It is also caused by low oil level or burnt oil. This vehicle has a very less transmission oil capacity which causes early failures.
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This vehicle adapts itself to specific driving conditions and create shift points. This function is primarily controlled by the Power train control module and the transmission control module.
ECM of vezel
When the computer detects any abnormality in torque curve, harsh shifting or a problem in the sensors it will set the P2788 Code. The codes are usually set if any change is monitored that exceeds the parameter values.This is usually based on throttle position, engine speed, engine load, and vehicle speed calculations.
A poor fuel average is one of the signs of a hybrid having a transmission problem.
Transmission fluid level
The first thing to look for in a car with these issues is the level of transmission fluid, its state (burned or not burned), pressure solenoid data using a professional scan tool and also the type of oil, a lot of cars coming for repairs are having overfilled oil, usage of wrong oil or absence of oil.