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What are the symptoms of a faulty transmission computer?

2 Answers

OSamuel

08/30/25 5:49am

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.

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LeChase

09/12/25 2:54am

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.

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