Why Does the Toyota Corolla Transmission Fail?

1 Answers
LeJoy
07/30/25 2:48am
Toyota Corolla transmission failure reasons are detailed as follows: 1. Dry grinding of the transmission due to insufficient transmission oil. A metallic dry friction sound from the transmission indicates a lack of oil or poor oil quality. 2. Damage to individual teeth of a gear inside the transmission. If a noticeable noise occurs when shifting into a certain gear while driving, it indicates wear on the teeth of that gear; if a periodic noise occurs, it suggests damage to individual teeth. 3. A sudden impact sound during transmission operation is often due to broken gear teeth. The transmission cover should be promptly removed for inspection to prevent further component damage. If a noise occurs due to gear collision during shifting, possible causes include the clutch not disengaging, incorrect clutch pedal travel, damaged synchronizer, excessive idle speed, improperly adjusted gear lever, or tight guide bushing. In such cases, first check if the clutch can disengage, then adjust the idle speed or gear lever position separately, and inspect the tightness of the guide bushing and release bearing fit.
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