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Transmission slipping is the phenomenon of delayed or misengagement of the transmission gear during acceleration. In a BMW transmission, slipping is manifested through several malfunction signs that include delayed engagement of the gear, a Surge in RPM without an increase in vehicle speed, loss of power and performance, abrupt, rough, or harsh shifting, unusual noises from the transmission unit, and a distinct, acrid smell of burnt transmission fluid.
If you’re experiencing issues with your BMW in Brooklyn, visit Bay Diagnostics, our auto service shop specializing in European and Import auto repair and services, committed to providing the best auto services in Brooklyn, New York. As a BMW owner, you likely understand the causes of transmission slipping in your car, enabling you to take appropriate steps when needed.
Factors Causing BMW Transmission Slips
Our expert technicians at Bay Diagnostics explain the factors that cause a BMW transmission to slip.
Low or Contaminated Transmission Fluid
Transmission fluid is called the lifeblood of the transmission system and serves as a lubricant, a coolant, and a means of maintaining hydraulic pressure in the vehicle. That’s why when the transmission fluid becomes low or contaminated, the whole system malfunctions. It is the most common factor of transmission slipping in BMW.
Due to leaks in the valve, gasket, or seal in the transmission unit, the fluid level decreases and the hydraulic pressure drops. As a result, the clutch pack fails to engage, causing slipping. Over time, the fluid degrades, collects debris, and loses its lubricating properties due to overheating and excessive wear, leading to transmission slipping. Using an incorrect fluid type that is incompatible with your BMW model also causes transmission slipping.
Worn Clutch Packs or Bands
The clutch packs or bands in BMW automatic transmissions are responsible for transferring power through engagement and disengagement. The process creates friction. Usually, after tens of thousands of miles, the packs wear and function abnormally. Excess heat from low or contaminated fluid causes premature wear of the clutch packs. Without sufficient hydraulic fluid pressure, the clutch cannot engage fully, resulting in a malfunction.
Faulty Valve Body
The valve body, often referred to as the brain of the transmission, consists of complex passages, valves, and solenoids that direct transmission fluid to the appropriate clutch packs and bands, facilitating gear changes. Over time, sludge and debris cause the valves to stick, preventing them from opening and closing properly and negatively affecting the transmission. The solenoids in the valve body are electronic actuators that apply force to the fluid. Faulty solenoids deliver the wrong fluid pressure, causing transmission slipping.
Mechatronic Unit Malfunction
The mechatronic control unit is a key feature of modern automatic transmission systems, serving as the system’s control unit. Malfunctions in the mechatronic unit, such as bridge seal leaks, circuit board malfunctions, and solenoid malfunctions, are caused by age, heat, and vibration. The mechatronic malfunction causes an imbalance in transmission, resulting in transmission slipping.
Software Issues
The heavily electronics-integrated transmission system runs BMW-proprietary software, and a malfunction in this software disrupts transmission operation, causing it to slip. Outdated software often faces a logic shift and fails to execute operations. Software corruption due to a power surge, faulty sensor input, or a low battery can also cause transmission slip. The software in your vehicle adapts the transmission to driving styles, and if the adaptation process is reset improperly, it can cause incorrect shift pressures and slipping.
Sensor Issues
The transmission in modern BMWs is controlled by the transmission control unit and its software. These depend heavily on the sensors throughout the system to execute their function. If, due to electronic malfunction, physical damage, or age, the sensors malfunction and send incorrect data to the control unit, the BMW’s transmission breaks down and cannot perform its functions.
Premier Transmission Service at Bay Diagnostics in Brooklyn, NY
For transmission slipping issues in Brooklyn, 
visit Bay Diagnostics, our auto repair shop, for specialized European and Import auto services tailored to your BMW. Our expert, experienced, ASE-certified auto specialists conduct a thorough diagnosis and precisely repair your BMW’s transmission slipping issues.
With over 40 years of experience, we have established ourselves as a trusted alternative to dealers. In our facility, we possess factory-grade repair tools and scanners. We back our work with a 36,000-mile/36-month warranty. Operating from 1717 Gravesend Neck Road in Brooklyn, we also serve Manhattan and other areas of New York City.