Erratic Gearbox

[drummer]

I own a 2013 Mercedes-Benz E250 CDI AMG Sport Coupe. I have not had it for an extended period, nevertheless I have encountered a problem since acquiring it.

Initially, I suspected the vehicle was misfiring; however, it idles flawlessly and maintains any RPM without difficulty. I am uncertain about the underload, but I suspect the problem lies in the automatic gearbox.

While driving, the vehicle exhibits a sensation of misfiring, indicating an unhappy engine, as shown by fluctuations in the rev counter of a few hundred RPMs. The sensation resembles the gearbox attempting several gears. The gearbox display remains fixed on D3, D4, D5, or the appropriate gear, without indicating any transitions. The problem is more pronounced in E driving mode, somewhat improved in S mode, and somewhat alleviated although still present in manual mode.

I am enquiring whether anybody has already had a similar experience. No dashboard lights are illuminated; the vehicle starts without issue, and all other functions operate well save for this.

It is more noticeable when driving on the dual carriageway, less so in urban areas; yet, it is clearly perceptible whilst cruising.

[bvlenci]

What is the car's mileage? When was the gearbox last maintained?

Furthermore, it must be compatible with STAR, or at the very least, with iCarsoft or a comparable system.

[drummer]

The mileage is 95,000. The previous gearbox service date is unknown; nevertheless, the vehicle had servicing two years before.

The computerised service record displays no information whatsoever.

[drummer]

The Icarsoft. I was examining one of them moments ago.

[Paqngo]

Depending on the mileage accrued (presumably little for a diesel) during the last two years, the vehicle requires servicing, indicating it is 12 months overdue for maintenance.

The gearbox requires maintenance every 40,000 to 60,000 kilometres.

Instead of only spending around £300 on a gearbox service, it is advisable to have the codes examined, since it may indicate a malfunctioning component.
It may not be, but it is prudent to ascertain initially.

[alpaco45]

The 7g+ gearbox will need maintenance every five years or after 77,500 kilometres.

[bvlenci]

As already said.

I recommend scheduling a gearbox repair with a Mercedes-Benz expert, rather than a franchised dealer. Ensure they first scan the error codes using STAR and then provide their assessment on whether a gearbox service would rectify the problem.

Purchasing an iCarsoft MB V2 or V3 allows you to delete problem codes and monitor their recurrence, provided you document the fault codes prior to deletion. Transmission issues are characterised by the fact that, even upon identification, there is little scope for DIY repair of the issue.

If the error codes are cleared and do not reappear, everything is OK; nevertheless, it is still necessary to maintain the gearbox owing to its age and usage.

[drummer]

Thank you for the counsel. I will arrange for it to be hired at a location. A buddy has a TOPDON ArtiDiag EU code scanner, but I am uncertain whether it will be capable of reading any codes.

[Screwdriver_1]

If you have recently purchased it, have the garage address the issue under warranty.

[drummer]

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