Why does the Mercedes-Benz GLA dashboard display 'Unable to shift to reverse gear'?

[EleanorLee]

The reason why the Mercedes-Benz GLA dashboard displays 'Unable to shift to reverse gear' can basically be attributed to transmission issues. Analysis of the fault causes is as follows: First, the wet clutch friction plates of the transmission are stuck in the spline groove. Second, the reverse gear clutch oil drain valve fails to seal properly. Third, the splines of the transmission's reverse gear wet clutch are worn. Note: Hydraulic transmission (automatic transmission) maintenance is much simpler than mechanical transmission (manual transmission) repair. However, due to its simpler structure, maintenance requires careful attention, as seemingly insignificant issues can lead to rework. When shifting into reverse gear, the reverse gear indicator light comes on, indicating that the transmission's wet clutch has received hydraulic oil, and the light only illuminates under pressure. Detailed explanation of Mercedes-Benz GLA warning lights is as follows: Mercedes-Benz GLA coolant temperature gauge warning light; the coolant temperature gauge in most vehicles is typically a pointer type. Under normal temperature conditions, the pointer usually points within the area before the red zone, with a temperature value around 95 degrees Celsius, sometimes higher in some vehicles. The coolant temperature gauge indicates the current temperature of the vehicle, showing whether the engine is operating within the normal temperature range or if there are abnormal conditions such as overheating. Mercedes-Benz GLA engine fault light; if this warning light comes on or the pressure gauge indicates too high a value, the engine must be turned off immediately. First, check if the engine oil is low by turning off the engine and pulling out the engine oil dipstick to see if the oil level is between the minimum and maximum marks. If the oil level is normal, a professional technician should be consulted to determine the cause of the light. Mercedes-Benz GLA ABS warning light; if the ABS light comes on while driving, it indicates an abnormality in the ABS electronic control system. In this case, the normal braking system usually remains functional, but the ABS system does not work.