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Automatic transmission does not shift gears – causes of malfunction and troubleshooting

Automatic transmission does not shift gears - causes of malfunction and troubleshooting 1
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Automatic transmission does not change gears – manual for the “automatic machine” repair, expert advice on operating a car with automatic transmission

Automatic transmission does not shift gears - causes of malfunction and troubleshooting 2

What to do if the automatic transmission does not shift gears

Automatic transmissions are a mechanism widely used in the vast foreign and domestic car markets. Indeed, such gearboxes have many advantages, which explains the desire of buyers to buy just such a car. But “automatic machines”, like any other equipment, tend to fail, and far and forever, an automatic transmission repair manual can help. Therefore, we will try to consider here the main problems that owners of automatic transmissions face. And as practice shows, most often the automatic transmission does not shift gears.

So what to do if the gears do not switch to automatic transmission, what is the reason for this? The device “automatic” involves the inclusion of high-speed mode in the automatic order, when the speedometer needle reaches a certain threshold. This system can work perfectly in normal operation, but if the balance is disturbed, the “automatic” does not change gears, as a rule, this happens in D-mode, then the driver has to switch to manual mode. No automatic transmission reaction usually occurs also in mode S. Everything seems to be normal on a mechanical gear shift and the car moves on, the “machine” listens, but when switching to mode D, the situation repeats, the speed decreases immediately and the automatic transmission does not switch. Sometimes it happens that a car refuses to start at a neutral speed.

What to do? At the very beginning, it is necessary to conduct computer diagnostics, which in most cases makes it clear what exactly the problem is, but if such diagnostics do not bring results, and the transmission does not switch to automatic transmission, experts advise to pay attention to the wings, speed sensor and wiring.

What to do? Study the repair manual for the “machine” and check everything carefully. The backstage is cleaned and moved, the wiring of the speed and transmission sensor changes if necessary. Inspect the sensor itself, because if it is out of order, the system will not be able to receive a command to switch speed from it.

If everything is done and checked, but still the “machine” does not switch, the reason may lie in the breakdown of the automatic transmission itself or the brake belt sensor. First of all, attention should be paid to the tape, its replacement, as a rule, does not cause special difficulties. But if this does not help, then the cause of the breakdown is more global and perhaps requires repair of the “machine” itself.

And for such gearboxes to work without breakdowns, drivers still need to know how to start a car with automatic transmission. If we are talking about winter, then before starting a car with automatic transmission, you need to warm it up so that the oil in the “machine” warms up a little and becomes more liquid, which is especially important in severe frosts. If you do not follow this recommendation, this can lead to big problems and to the failure of the “machine”. In addition, a car with automatic transmission must overcome the first kilometer in severe frost with a minimum speed.

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