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I have a 2010 C300 4Matic Sport. Today I got flashing triangle and it felt like the car was cutting power. At first it felt like the transmission wasn't shifting correctly but after some driving it just feels like power is cutting out almost like traction control is kicking in for no reason. I tried to make a video for you guys. Any ideas?
I have a 2010 C300 4Matic Sport. Today I got flashing triangle and it felt like the car was cutting power. At first it felt like the transmission wasn't shifting correctly but after some driving it just feels like power is cutting out almost like traction control is kicking in for no reason. I tried to make a video for you guys. Any ideas?
The check engine light is also illuminated, even before the flashing triangle. Read the OBD codes with a Mercedes-specific scanner, then post them here. The two might be related.
You have a check engine light on that may or may not be related. Have you scanned the car for fault codes, if so what are they? If not I would get a Mercedes specific scanner, Launch scanner for $120-ish is fine.
I have a 2010 4matic. The only time I have had that triangle warning light flash on/off is when I would be traveling down the highway and go over a large bump and the car would feel like it got some air, light would flash briefly. I ended up replacing the rear worn shocks and havent seen the light come on since. Not saying thats your issue, just pointing out it can be lots of things.
Worn tires, since it looks like it was raining out?
The symbol you’re describing—a small triangle with a car profile inside it—typically appears on a car’s dashboard as a warning light. While the exact meaning can vary slightly depending on the car’s make and model, it’s often associated with a collision warning system or automatic emergency braking system.
This symbol usually indicates that the car’s sensors have detected a potential collision risk, such as another vehicle, pedestrian, or obstacle being too close. It might flash or light up with an audible alert to warn the driver to take action. In some cases, it could also mean the system has engaged or there’s an issue with the sensors (e.g., they’re dirty, blocked, or malfunctioning).
For example, on some Mercedes-Benz models, a red triangle with a car inside it is tied to the Collision Prevention Assist system, alerting you to a sudden hazard. In other brands, it might relate to similar safety features like forward collision warning.
To be certain, I’d recommend checking your car’s manual, as symbols can differ between manufacturers. If it’s persistent and you’re unsure, it might be worth a quick trip to a mechanic to rule out a sensor problem. What kind of car do you have? That could help narrow it down!
Last edited by RobertR728; Apr 10, 2025 at 05:21 PM.
Thanks for the replies fellas....sorry about the video quality but that is the best I could do at the time.
The engine light is due to the emissions air pump. That stupid thing goes bad often and I'm honestly tired of replacing it.
My scan tool is able to scan every Mercedes module and other than the air pump related ones there were no codes.
My scan tool also allows me to monitor data real time. Based on the earlier comment about the wheel speed sensor I looked at the live data for that.
It was giving RPM's while driving and I'm not sure what a good number is for the mph but when I was parked it said 24.9 rpm. So it would seem to me that its bad.
I also found a youtube video about putting the car in dyno mode to take ABS/ECS/ECS nanny controls out of the equation. So I did that and the car drives completely fine.
At this point I think I'll throw a few bucks at new ABS/wheel speed sensors and see what happens. They seem pretty easy to replace.
What do you guys think?
Last edited by jacobsed; Apr 11, 2025 at 12:42 PM.
I think you need a Mercedes specific scanner to start with if you wanna trouble shoot these cars. And just replacing para ***** billy will get expensive
Last edited by RobertR728; Apr 11, 2025 at 03:24 PM.
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