BENZE220AMG Posted February 14 Share Posted February 14 I own a 2014 Mercedes CLA that exhibits an intermittent issue when the vehicle halts, approaches a stop, or accelerates from a standstill. The vehicle vibrates and displays a warning light; do not shift gears and contact a workshop. I must turn the vehicle off and then on again before I can resume driving normally. Today, while en route to the garage for a diagnostic of the fault, I encountered an additional error message indicating a gearbox malfunction in red as the vehicle was stationary and prepared to accelerate. The gearbox shifted into neutral, necessitating my intervention to re-engage Drive, after which the car operated normally. The issue is sporadic, which is somewhat frustrating. The garage linked the automobile to their star diagnostics, but no problem signals or codes pertaining to the gearbox were found. The technician suggested that doing a software update, if available, may potentially resolve the issue before further investigation, since the diagnostics revealed no defects related to the gearbox. The vehicle has just reached 120,000 km and requires its second gearbox service. Any guidance would be welcomed, particularly from others who have encountered a similar issue. Quote Link to comment Share on other sites More sharing options...
QuirkyPixel Posted February 14 Share Posted February 14 It is necessary to retrieve problem codes using the diagnostic equipment. Common issues include wear in valve bodies and dual clutch units. Given the age of the vehicle, you should have completed three gearbox oil maintenance by now. Quote Link to comment Share on other sites More sharing options...
BENZE220AMG Posted February 14 Author Share Posted February 14 Thank you for your reply. The garage linked the star to it but detected no defects. The alternatives presented to me were to first verify for any software changes next week and thereafter examine the valve body. They were astonished that nothing was revealed about the celebrity as well. Quote Link to comment Share on other sites More sharing options...
coolguy Posted February 14 Share Posted February 14 It is certain that only MB STAR will do the task. However, if the garage proposed to execute a gearbox software upgrade, he would probably want a genuine MB STAR scanner. Did he propose that the vehicle be transported to a dealership for the software update? Generally, the common problems include inadequate service (for a 2014 vehicle, the ATF should have been replaced twice, first in 2019 and again in 2024) or a defective gearbox control unit (TCU). However, there may be further complications. Quote Link to comment Share on other sites More sharing options...
BENZE220AMG Posted February 14 Author Share Posted February 14 Thank you for your reply. The garage have the capability to do a software upgrade, since they are Mercedes-Benz specialists in Birmingham. What is your opinion on a software update? Thank you for the information on ATF servicing. I believed it was had to be completed every 60,000 miles. I appreciate your assistance, everyone. Quote Link to comment Share on other sites More sharing options...
coolguy Posted February 14 Share Posted February 14 I am uncertain about the A-Class; but, for the C-Class, the 7G+ gearbox requires servicing every 77,500 miles or every 5 years, whichever occurs first. Quote Link to comment Share on other sites More sharing options...
alabbasi Posted February 14 Share Posted February 14 The 724 gearbox is a dual-clutch gearbox, not a torque converter type, and requires servicing every 62,000 miles or every 5 years. It is quite probable that a shifting calibration is required, or alternatively, your clutch plates may be deteriorated. It is anticipated that conditions will improve with a fluid modification and a software update. Quote Link to comment Share on other sites More sharing options...
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