![]() These codes can be read with a diagnostic tool and may indicate the specific issue with the transmission. Warning lights or error codes: The transmission control module (TCM) may set error codes or activate warning lights in the event of a transmission malfunction.Leakage: Transmission fluid leakage can be caused by worn or damaged seals, a malfunctioning transmission cooler, or a damaged transmission case.Grinding or whining noises: These noises can be caused by worn gears or bearings, a malfunctioning clutch, or low transmission fluid levels.Harsh or delayed shifting: This can be caused by a variety of issues, including worn or damaged transmission components, low transmission fluid levels, or a malfunctioning transmission control module.This can be caused by worn gears, a malfunctioning clutch, or low transmission fluid levels. Slipping: This occurs when the transmission is unable to maintain a consistent gear ratio, causing the engine RPM to increase or decrease without a corresponding change in vehicle speed.There are several signs that your transmission may be going out. Common BMW Transmission Warnings & Symptoms In the safe home, fail-safe, or limp mode, the transmission stays in second gear and no longer shifts. When the engine control unit (ECU) detects a problem that can lead to transmission damage, the vehicle forces the transmission to go into limp mode to minimize further damage. To diagnose a BMW transmission, you must use a BMW scan tool and read the codes from the transmission control unit. Faulty MAF sensor – You may experience transmission issues such as erratic shifting between gear changes.Īs you can see in this list, BMW transmission problems such as no shifting or erratic shifting are not always caused by the failure of a transmission component.Faulty alternator regulator – Transmission problems are sometimes caused due to a bad voltage regulator mounted on the alternator.Battery too weak– low voltage is a common reason a BMW gets stuck in gear.The vehicle will no longer change gears and throw warning messages on the dashboard. Defective mechatronic unit – A prevalent issue is a faulty valve body, also known as mechatronic units in BMW terms.Fluid leaking around the oil pan gasket or wire harness plug to the transmission is common on high-mileage BMW vehicles. Low transmission fluid level – The vehicle will drive OK and then go into limp mode.The most common problems that cause a BMW transmission to malfunction include the following: ![]()
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