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Automatic transmission faults Dipstick Oil Level Mostfaults in anautomaticgearbox arecaused by the oillevel being too low. Torque Converter Ifthe torque converteris damaged the carmay not accelerateproperly. Downshift cable Controls the gearbox kickdownfacility. If the cable is damagedor badly adjusted, the gearboxwill not change down when youneed it. Selector linkage If the linkage is badlyadjusted gearselection may suffer. Inhibitor switch Prevents the engine frombeing started in any gear otherthan 'neutral' or 'park'. If it isbroken the engine may notstart or there is a danger of thecar being accidentally startedin drive. Ventilation grille Helps to keep the torqueconverter cool. Make sure itis not blocked by dirt ordebris, otherwise thegearbox may overheat.

Because of the large number of parts inside an automatic gearbox, some faults may be caused by more than one component.

The first check should always be on the transmission fluid level and its condition — if it is all right, then you will need to check the other points shown here.

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Diagnosing faults in automatic transmission

Although they are considerably more complicated than manual gearboxes, with control and operating...