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What causes the Mercedes-Benz GLA to indicate inability to engage reverse gear?

1 Answers

AustinMarie

07/29/25 1:10pm

For automatic transmission vehicles, the inability to reverse can generally be attributed to transmission issues. When attempting to engage reverse gear, if the reverse gear indicator light is illuminated, it indicates that the transmission's wet clutch has supplied hydraulic oil, and the light only turns on when there is sufficient pressure. Analysis of potential fault causes is as follows: 1. Friction plates: The wet clutch friction plates of the transmission are stuck in the spline groove. 2. Oil valve: The reverse clutch oil drain valve fails to seal properly. 3. Splines: Wear has occurred on the splines of the transmission's reverse wet clutch. Note: Hydraulic transmission systems (automatic transmissions) are generally simpler to diagnose and repair compared to mechanical transmissions (manual transmissions). However, due to their simpler structure, inspections require meticulous attention to detail. Often, overlooking a single seemingly minor issue can lead to the need for rework.

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