What are the symptoms of a faulty transmission computer?

[OSamuel]

During driving, the engine may idle, and after stopping and restarting, you may find that the car does not move when shifted into drive, but it moves when shifted into reverse. Here are the related introductions about two types of transmissions: 1. Mechanical Continuously Variable Transmission (CVT): The characteristic of a mechanical continuously variable transmission is that the gear ratio is not a series of discrete points but a continuous range of values. This better coordinates the vehicle's external driving conditions with the engine load, fully utilizing the engine's potential and improving the vehicle's fuel economy. It provides flawless traction performance, significantly enhancing the overall vehicle performance. Currently, steel belts or similar methods are commonly used for power transmission. 2. Automated Manual Transmission (AMT): The automated manual transmission is an improvement over the traditional manual gear transmission. It is an integrated electromechanical-hydraulic automatic transmission that combines the advantages of both AT (automatic) and MT (manual). AMT not only has the automatic shifting benefits of a hydraulic automatic transmission but also retains the high efficiency, low cost, simple structure, and ease of manufacturing of the original manual transmission's gear drive.

[LeChase]

A faulty transmission computer exhibits several noticeable signs. Having repaired countless vehicles, I've observed the most common symptom is extremely rough shifting - the car may suddenly lurch forward as if kicked, even during smooth driving. Sometimes the RPMs soar to 4,000-5,000 without upshifting, which is incredibly frustrating. In severe cases, it may limit gear selection, locking you into a single gear like only 3rd or reverse. The dashboard will definitely illuminate a yellow warning light or flash trouble codes, with some models displaying "check engine" messages. This component failure requires immediate attention - get it to a shop for OBD scanner diagnostics promptly, otherwise it may cause collateral damage to transmission gears.

[EvanAnn]

Last time, my friend's CR-V had the same issue. While driving, the speed kept fluctuating, and even on flat roads, it felt like climbing a hill. The fuel consumption was also significantly higher than usual, with a full tank barely lasting 400 kilometers. The scariest part was the gear icon on the dashboard flashing non-stop, and it even got stuck twice while reversing, almost hitting a wall. He thought it was an engine oil problem, but the repair shop said it was the transmission computer acting up. If this kind of thing breaks, you need to fix it immediately. Delaying could lead to the internal mechanical components of the transmission getting damaged as well.

[DelAshley]

Transmission control module failure primarily affects drivetrain performance. The most common symptom is erratic shift logic: failing to downshift when needed, resulting in poor climbing power; delayed upshifts accompanied by engine revving without acceleration. Occasional harsh shifting is another indicator, particularly noticeable during 2-3 gear changes with distinct jerking. In severe cases, the system enters limp mode, limiting maximum speed to third gear while causing rapid transmission fluid temperature rise. Such failures are often accompanied by illuminated check engine lights due to coordination failure between ECU and TCU.