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Steering Assist, Lane Keep Assist Failures

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Steering Assist, Lane Keep Assist Failures

Old 05-08-2019, 02:05 PM
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Join Date: May 2019
Location: Southern CA
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C300 Cabriolet
Steering Assist, Lane Keep Assist Failures

My 2019 C300 Cab has the Driver Assist package (997) which includes Active Steering Assist and Active Lane Keeping Assist, among other "assist" features. When Lane Keep assist is on, I sometimes get a warning (wheel pulsation or visual, or both), when I cross a lane marking, and sometimes I don't. To confirm the intermittent failure, I try to eliminate variables and always ensure I am inside marked lanes on both sides of the vehicle, and also not in intersections where the lane markings typically don't exist. Lane Keep Assist failure (no warning) occurs often.

With Lane Keep and also Steering Assist on, (along with cruise control), the vehicle weaves noticeably from one side of the lane to the other. Happens on surface streets as well as freeways, always in well-marked lanes. Sometimes vehicle will even cross into an adjacent lane. If I was driving like that (without the electronic features), I would be pulled over for erratic driving. Steering Assist failure occurs often.

I brought the car in for a seat belt recall and had the dealer Service check everything, and of course they said it's all working fine, even with a road test. Mechanic tried attributing failures to me not having the features turned on (of course they were turned off when I brought the car in because I don't use them because they don't work). I asked which road(s) they use for road tests and drove them a few times myself and the Lane keep and Steering Assist both failed.

I brought the card in again and did a road test with a "shop foreman" and everything failed (intermittently) for him also, (he grabbed the steering wheel more than a few times because he feared the car would go off the road). However, he got another 2019 C300 Cab from the lot and we drove it and it had the same problems, although I don't think quite as severe (unscientific). So he says the car/functions are "working as designed". I said anyone would be out of their mind if they accepted that Lane Keep assist doesn't keep you in your lane or warn you if you stray, or accepted that Steering Assist would weave from side-to-side, occasionally departing the lane, and asked that he report the problems to Mercedes Marketing, Engineering, Design, or whoever, but he said they "have no channels to report those things". Seriously?? I asked to speak to the Service Director, who essentially gave me the same stories, (working as designed; can't report to anybody), and that I should contact Customer Service.

This is the first Mercedes I ever owned, and priced at the top end of a C-class, and I must say at this point the dealer seems to be just as bad as any other car dealer I have ever dealt with, and deserving of the bad stories car dealers always get. I will pursue the Mercedes Customer Service route, but reading online stories about others contacting Mercedes Corp. with significant car issues, I'm not hopeful. My reason for posting this is to ask if anyone else with a late-model Mercedes with these Assist features has had similar problems and if so, has had better results with solutions.
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