Sensors can become damaged because of old age, an electrical short, or excessive temperatures.Ĭheck the codes with a code scanner compatible with your ECM and TCM and check for any related trouble codes on shift solenoids or other sensors and solenoids. If the VSS sends a bad signal to the ECM while the car is in first gear, it might not be able to shift out of this gear. If the engine control module (ECM) detects an issue with the sensor monitoring the transmission position or speed, it will alert you to the fault. There are sensors on the transmission that monitor the shifting. RELATED: Transmission Fluid Color Chart (5 Different Colors) 2. As impurities in the fluid buildup, lubrication is diminished, and contaminants infiltrate the system. If the low levels are consistent, you want to hunt down the leak which is causing the system to lose fluid.Īdditionally, contaminated fluid can lead to hard shifting. If the transmission fluid becomes too low, the clutch and gears will grind because of a lack of lubrication. The most common reason your transmission is shifting hard is due to fluid concerns. Here is a more detailed list of the common reasons why an automatic transmission is shifting hard: 1. The most common reasons why an automatic transmission is shifting hard are due to transmission fluid issues, a bad transmission vacuum modulator, a failed transmission sensor, a bad shifter cable, or cold weather. How to Fix Hard Shifting Transmission Transmission Shifting Hard Causes (Automatic)
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