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

1 Answers

Jane

09/07/25 7:49am

Here are the symptoms of an automatic transmission failing to upshift: Symptom one: During driving, the automatic transmission can only shift to 1st gear and cannot shift to 2nd gear or higher gears. Symptom two: During driving, the automatic transmission can shift to 2nd gear but cannot shift to 3rd gear or overdrive. Here is additional information for troubleshooting an automatic transmission that fails to upshift: Connect a diagnostic scanner: Check for trouble codes. If any trouble codes are present, perform repairs according to the code instructions. If no trouble codes are found, read the data stream to check whether the operating characteristics of related sensors have changed and whether the actuators are functioning properly. Automatic transmission: Check the automatic transmission fluid level and the quality of the transmission fluid. A low fluid level can cause low main oil pressure, leading to brake or clutch slippage. Poor fluid quality can also cause slippage or even more severe faults, preventing the automatic transmission from upshifting.

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