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Active Brake Assist Functions Limited

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Old Nov 21, 2023 | 01:06 AM
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Angry Active Brake Assist Functions Limited
Hey guys, so I was driving the other day and I get a message showing “Active Brake Assist Functions Limited.” I also had a check engine light. I would also be stuck in 3rd gear while coming to a stop. The cluster would literally show 3rd gear and 0 mph. I would try to manually shift the gears to first but it would not work. I was just wondering if the active brake assist functions being limited has anything to do with my car being stuck in 3rd gear.

2021 GLC 43

Thank you!
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Old Nov 21, 2023 | 10:13 AM
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When I got the brake assist message, it was because of a chip in the windshield at the camera cluster.
Curious: what driving mode do you usually use? Does using a different mode have a different outcome?
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Old Nov 21, 2023 | 10:38 AM
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'21 AMG53 wDPP & ARC, 19 GLC300 - Former-03 C240,2 ML BlueTecs,20 GLE450 E-ABC,15 Cayenne D,17 Macan
A bug splat can also cause that problem.
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Old Nov 21, 2023 | 06:58 PM
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Old Nov 21, 2023 | 07:00 PM
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Originally Posted by edpare
When I got the brake assist message, it was because of a chip in the windshield at the camera cluster.
Curious: what driving mode do you usually use? Does using a different mode have a different outcome?
Oh I see. In my case, there were no chips on my windshield near the camera cluster area. I switch between comfort and sport plus. When you get the brake assist message, do you lose power and can’t accelerate past a certain amount of RPM?
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Old Nov 21, 2023 | 07:02 PM
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Originally Posted by mikapen
A bug splat can also cause that problem.
Yeah, a lot of people are saying that it could be the sensors dirty or the top center of the windshield needs to be cleaned but I thoroughly washed my car and the message still came up.
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Old Nov 22, 2023 | 09:39 AM
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Originally Posted by Own
Oh I see. In my case, there were no chips on my windshield near the camera cluster area. I switch between comfort and sport plus. When you get the brake assist message, do you lose power and can’t accelerate past a certain amount of RPM?
Never experienced those symptoms. Sounds like the car is trying to protect itself. What did the M-B service advisor say?
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Old Nov 22, 2023 | 01:43 PM
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Originally Posted by edpare
Never experienced those symptoms. Sounds like the car is trying to protect itself. What did the M-B service advisor say?
Dropped the car off a few days ago, still waiting for a response 😩
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