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What are the symptoms of an automatic transmission failing to upshift?

1 Answers

JadeLynn

09/01/25 4:25am

Here are the symptoms of an automatic transmission failing to upshift: 1. Symptom one: The automatic transmission can only shift to 1st gear during driving, unable to engage 2nd gear or higher gears. 2. Symptom two: The automatic transmission can shift to 2nd gear during driving, but cannot engage 3rd gear or overdrive. Below is extended information for troubleshooting automatic transmission upshift failures: 1. Connect a diagnostic scanner: Retrieve fault codes. If fault codes are present, perform repairs as indicated. If no fault codes exist, read data streams to check whether relevant sensors' operating characteristics have changed and whether actuators are functioning properly. 2. Automatic transmission inspection: Check the automatic transmission fluid level and quality. Insufficient fluid level will cause low main line pressure leading to brake/clutch slippage, while poor fluid quality may cause slippage or even more severe failures preventing the automatic transmission from upshifting.

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