What is the reason why the Mercedes-Benz does not move in D gear?

[Francis]

Reasons why the Mercedes-Benz does not move in D gear: Functional comprehensive failure: When the car does not move after shifting gears, it is a functional comprehensive failure involving the clutch, transmission, and drive axle. When diagnosing, the fault location should be determined first. You can start by checking the condition of the two wheels. Starting in gear, the drive shaft does not rotate: If the car does not move when starting in a certain gear and the drive shaft does not rotate, it indicates that the fault is in the transmission. Remove the transmission cover and inspect whether the transmission shift fork is broken or whether the guide block fixing screws are loose. Here are the related content introductions: Gear shifting experiment: If the above checks are normal, proceed with the gear shifting experiment. If the second shaft does not rotate in a certain gear, it means the half-round key of that gear's gear is cut off. If the second shaft rotates in direct gear but does not rotate in other gears, it indicates that the support bearings at both ends of the intermediate shaft are disassembled and the intermediate shaft has fallen.

[LilahDella]

A Mercedes-Benz owner encountered the same issue a couple of days ago. After careful inspection, I found it's usually caused by the transmission. When an automatic car won't move in D gear, the most likely culprit is a malfunction in the transmission control module - that little computer board responsible for gear shifts might be faulty. Another possibility is a clogged valve body, which regulates oil pressure; when blocked, the oil flow gets restricted. The most common cases I've seen involve insufficient transmission fluid or degraded (blackened) fluid, especially in vehicles that haven't had an oil change for 80,000 km. Also, don't overlook the torque converter - if this big component slips or its clutch plates wear out, power transmission gets completely interrupted. Electronic shift levers can sometimes act up too, failing to send signals to the transmission computer. If you notice these symptoms, it's best not to force-drive the vehicle. Calling a tow truck for professional diagnostic scanning at a repair shop is the safest approach.

[June]

Last time I helped a friend with his Mercedes-Benz E-Class that wouldn't move in D gear, and found there could be quite a few possibilities. First, check if the brakes aren't fully released or if the electronic parking brake is stuck on the wheels. Then, look at the dashboard to see if any warning lights are on—if the drivetrain malfunction light is illuminated, that's something to watch out for. In my friend's case, it turned out to be a faulty transmission speed sensor, which failed after just over 50,000 kilometers. If the shift linkage is loose or jammed, it can also cause this issue, so you might need to get under the car to inspect it. Older Mercedes models are particularly prone to problems with the transmission control module, and repairs can easily cost several thousand. Another scenario is when the car won't move when cold but operates normally when warm, which is usually due to a worn-out spring in the oil pressure regulator valve. If you encounter this problem, avoid repeatedly shifting gears to test it, as this can easily destroy the transmission.

[LeRachel]

Don't panic if your Mercedes won't move in D gear - check these basics first. Verify if brake lights illuminate (a faulty brake switch can prevent movement). Ensure the gearshift lever is properly engaged by shifting multiple times. Always check the gear indicator display - it might be a false sensor reading. Contaminated transmission fluid (especially from low-quality oils) is another common culprit. If the engine starts but D gear doesn't respond, broken engine mount cushions could surprisingly cause this. Pro tip: Try disabling the start-stop function - this temporarily solved the issue for some owners. Remember: Mercedes transmissions are particularly delicate - DIY repairs often do more harm than good. When in doubt, head straight to the dealership.

[DawsonFitz]

My Mercedes repair shop handles several cars with 'D gear not engaging' issues every month. The most common scenarios we encounter are: First, electronic system glitches, like when the transmission control module freezes and requires reprogramming; second, mechanical component wear, especially in vehicles over seven years old where the torque converter's lock-up clutch gets worn out; third, hydraulic system problems, such as clogged filters or failing oil pumps. Last time, we even had a car where water ingress in the wheel speed sensor caused transmission misjudgment. We recommend changing transmission fluid every 60,000 km to prevent many issues. For temporary emergency fixes, turning off the engine for ten minutes before restarting, or disconnecting the battery's negative terminal for five minutes, can sometimes reset the system. If that doesn't work, it's time for a workshop visit.

[LeGraham]

Here's what I've figured out about Mercedes D gear failure: New cars mostly have electronic issues, while older ones tend to have mechanical problems. First, feel the impact when shifting gears. If there's no sensation at all, it's likely a stuck valve body; if there's a jerk but the car doesn't move, the clutch plates might be burnt. Checking the transmission dipstick is crucial—too much or too little fluid is bad. For electronic gear shifters, remember the foot brake must be fully depressed to unlock. Those who've modified audio or electrical systems should be cautious, as current interference can confuse the computer. There was a bizarre case where water in the trunk's fuse box caused the issue. Always remember to engage the handbrake before shifting to P when parking to reduce transmission stress. Lastly, it's worth noting that 9-speed transmissions have a 30% higher failure rate than 7-speed ones.