If you have no idea what you are doing, we recommend taking your car to a specialized mechanic. Most people have no clue how to test TCM on Duramax.

Gear shifting impossibility – the transmission fails to shift up while accelerating or shift down while stopping, not to mention getting stuck in neutral at times.

Slow acceleration – your vehicle drags and barely gets any speed when you need it.

Poor fuel economy – the fuel economy is declined severely for no apparent cause.

Gear slipping – the transmission will switch gears randomly with no signs or notifications.

Imagine losing acceleration while overtaking someone – do you still think you can delay the process?

Switching gears unexpectedly will have you lose control over the vehicle. We recommend fixing a faulty TCM immediately due to the fact of how dangerous it can get to neglect it. You can, however, drive with a faulty TCM, but it is only a matter of time until an accident occurs. If any of the following issues sound familiar, we recommend to check it right away. Doing either option too often is a waste of time and money.There are more symptoms associated with a faulty TCM. “In a high-mileage car, power-flushing the transmission fluid can dislodge sludge and other particles, leading to clogs even after the clean fluid has been added.”Īgain, the best advice is to research your vehicle and know exactly when a transmission drain (or flush) is recommended. “There is also a distinction between simply draining and refilling a transmission vs. “If that’s the case, it’s likely a sign of a bigger and more complicated problem.” “This shouldn’t be a frequent occurrence, since a gearbox in good working order would not have metal shavings polluting the fluid over a short period of time,” Ibbotson says. Getting rid of this dirty fluid makes sense, right? If it’s called for in the service manual, go ahead and let your mechanic do the job.

Over time, the transmission’s interior components wear down, and tiny particles contaminate the fluid. Transmission fluid helps keep mechanical components cool and lubricated, whether the gearbox is automatic or manual.

First, it’s helpful to understand the role transmission fluid plays in a car’s operation.

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