Inside the transmission, gears are working hard to create a smooth ride. RELATED: 6 Causes of Manual Transmission Hard to Shift (Especially 1st to 2nd) 2. With a regular transmission fluid check, you can ensure there’s always enough gear oil. Low fluid leads to overheating, and it creates a lack of lubrication that is required when engaging gears. If there is a leak or the gear oil gets low, you may experience issues with your transmission shifting hard. The manual transmission also requires fluid to keep the gears lubricated and running correctly. The most common causes of manual transmission shifting issues are faulty gears, a defective clutch, low gear oil, a damaged synchronizer ring, or a bad gear hub sleeve. RELATED: Should You Repair, Rebuild, or Replace Your Car’s Transmission? Transmission Shifting Hard Causes (Manual) ![]() If your transmission slips, it could be a sign of a bad torque converter. The torque converter is filled with transmission fluid, and therefore, poor transmission fluid can make the converter behave strangely.īut sometimes the torque converter can fail, and in this case, you have to replace it. The torque converter is located between the transmission and the engine to transfer the power from the engine to the wheels. In some cases, you will be able to adjust the shifter cable. You might see this show up most commonly when shifting between first and second gear. When this cable fails, there could be issues as the gears change. Bad Shifter CableĪutomatic vehicles often have a cable or linkage that connects the transmission to the shifter. When either of these happens, it can cause extra pressure on the transmission. This modulator is often installed on older car and transmission models. The car vacuum line can become twisted, pinched, disconnected, or clogged. If this modulator is failing, you might experience your transmission shifting hard. The transmission vacuum modulator valve is responsible for measuring the load from the engine to provide ideal shifting operations. As a result, you could experience rough shifting while the transmission relearns proper operation. If you disconnect the battery or there’s another type of fault, the adaptive transmission could fail to use its memory settings. There’s an internal computer regulating engine RPMs to ensure the transmission runs as it should. Some transmissions are considered adaptive in that they are consistently learning and adjusting to your driving patterns. If you add a reliable synthetic fluid to the transmission, you might alleviate issues with the temperature. Additionally, the parts inside have to work harder to pump the fluid around. Transmission fluid becomes thicker as the temperatures drop, leading to less lubrication. Until the transmission reaches its normal operating temperature, the operation could be rougher than normal. If temperatures are low and the transmission hasn’t warmed up yet, hard shifting might be considered normal. 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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