What Causes an Automatic Transmission to Fail to Engage Gear?

[DeCassandra]

There are three main reasons why an automatic transmission car fails to engage gear: 1. A malfunction in the gear shift lever assembly. 2. A fault in the P-gear lock solenoid valve inside the gear shift lever. 3. Damage to the brake light switch. Additional information: 1. When using the car's gear shift lever, precautions include: shifting gears requires looking down at the gear lever. Avoid driving in low gear for extended periods; generally, high gears are more fuel-efficient than low gears, so upshifting should be done promptly after starting. If the clutch pedal is not fully depressed during gear shifting, it can cause gear damage. Additionally, when not using the clutch, the foot should not rest on the clutch pedal, as this can lead to excessive wear on the release bearing. 2. If a gear fails to engage at first, avoid forcing it. When the gear lever is in neutral, avoid rocking it back and forth, as this can cause unnecessary wear on components and affect the timing of gear shifting. Do not skip gears when upshifting; upshifting should be done step by step to prevent loss of power continuity, while downshifting can skip gears. Avoid engaging reverse gear before the vehicle comes to a complete stop, as this can cause gear damage.