![]() It also helps transmit fluid pressure when the solenoid activates to activate the valve body.ĭegraded transmission fluid fails to lubricate the entire transmission properly and will look dark rather than light pink. Transmission fluid acts both as a lubricant for moving parts like the shift solenoid and the gears. Transmission fluid degradation due to age or overheating is the most common cause of shift solenoid problems. ![]() ![]() They’re made from robust steel and have a smooth cylindrical shape which doesn’t make them prone to failure without some other transmission fault being at play. Problems with the transmission fluid or the TCM are the most common reasons why shift solenoids will fail or activate intermittently. Causes of a Bad Transmission Shift Solenoid Each lettered solenoid is associated with a corresponding gear change from 1 to 2, 2 to 3, and 3 to 4. However, some go higher in letters up to E. Most cars with an automatic transmission have at least three transmission shift solenoids named A, B, and C. This, in turn, activates specific gear changes. It then sends electrical voltage telling the shift solenoid to allow transmission fluid into the valve body to pressurize clutch packs and bands. ![]() The car’s TCM simply takes the information from the engine as well as various speed sensors to decide when to shift gears for optimum power and fuel efficiency. In an automatic transmission, the shift solenoid actively helps shift the gears without you having to make any changes to the selector. ![]()
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