RudolphNuclear Posted June 21 Share Posted June 21 I am seeking assistance in identifying the issue that I have included below. When I fully depress the accelerator pedal, the vehicle downshifts and accelerates as expected. However, it does not shift gears, but instead returns to lower RPMs before engaging the appropriate gear. Link to comment Share on other sites More sharing options...
JayB Posted June 21 Share Posted June 21 Unfortunately, this is a concerning matter since I am not familiar with any other instances of this problem occurring with this particular transmission. Another worry of mine is that it let the automobile to exceed the redline, which is very undesirable and problematic. It is very important to connect a scanner to the automobile, especially if this action is performed often. The scanner will be able to detect and retrieve codes, allowing you to examine the information that is returned. Link to comment Share on other sites More sharing options...
JayB Posted June 22 Share Posted June 22 There seems to be a malfunction with the rpm limiter. It is advisable to refrain from driving the vehicle until a scanner is connected to diagnose the issue. Continuously exceeding the red line may potentially cause damage to the engine. Link to comment Share on other sites More sharing options...
RudolphNuclear Posted June 23 Author Share Posted June 23 I have had the vehicle examined with a Mercedes sky scanner and no defects have been detected. I am quite worried. Link to comment Share on other sites More sharing options...
JayB Posted June 23 Share Posted June 23 When was the transmission fluid last inspected and/or replaced? There may be several factors contributing to the problem. Firstly, the Electronic Control Unit (ECU) should have a safety mechanism in place to prevent the vehicle from exceeding its maximum engine speed (redline). I am curious whether the Electronic Control Unit (ECU) is defective and failing to provide accurate instructions to the gearbox, but the transmission itself is in good condition. Link to comment Share on other sites More sharing options...
RudolphNuclear Posted June 23 Author Share Posted June 23 It is possible that you are correct. Initially, I considered the possibility of slippage, but I am now uncertain about that concept. This behavior occurs only when the automobile is under significant strain, such as when applying maximum power from a stationary position or while moving at a very slow pace, as seen in the video. Link to comment Share on other sites More sharing options...
JayB Posted June 23 Share Posted June 23 I strongly advise against driving the vehicle vigorously until this issue is resolved. Over-revving the engine may have severe consequences and put its lifespan at risk. I am curious as to why there are no codes present. It is my understanding that XENTRY was used to do code checks, correct? Link to comment Share on other sites More sharing options...
RudolphNuclear Posted June 23 Author Share Posted June 23 I used the XENTRY system, but no results were found. This is somewhat peculiar. Link to comment Share on other sites More sharing options...
JayB Posted June 23 Share Posted June 23 Could you please provide the year of the car, its mileage, and the date of the most recent transmission fluid change? Link to comment Share on other sites More sharing options...
RudolphNuclear Posted June 23 Author Share Posted June 23 The car, which was acquired less than a month ago and has only been driven for 31,000 miles, requires immediate transmission servicing as it has never had this maintenance procedure before. Link to comment Share on other sites More sharing options...
JayB Posted June 23 Share Posted June 23 When did this issue begin occurring after the transmission fluid flush? Was the transmission fluid serviced at a Mercedes-Benz dealership or an independent automotive repair facility? Link to comment Share on other sites More sharing options...
RudolphNuclear Posted June 23 Author Share Posted June 23 The task has not been completed yet, but it is scheduled for next week. Link to comment Share on other sites More sharing options...
JayB Posted June 23 Share Posted June 23 Understood. I hope that there are no metallic particles present in the fluid and that it is in a good condition. Link to comment Share on other sites More sharing options...
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