Transmission malfunction drive moderately message.Transmission shifts hard, not smoothly.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 shitting are not always caused by the failure of a transmission component.Faultyalternator 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 first and then go into limp mode.
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