Q: Blinking of ESP and ABS activation with auto-braking on bumpy roads on a 2002 MI ML320

asked by on May 03, 2016

I have a 2002 MI ML320. Recently, it has started something weird--ESP's blinking on a speedometer, triangle thing flashes and activates the ABS. Brakes like auto-braking but it happens only when I go on bumpy roads.

ABS Light is on Inspection $79.99 - $99.99 Get a Quote

You’ve got a problem with the speed system on that car and those things are very complex. What you’d want to do is watch my video "fixing insanely complex modern cars," and you’ll see how complicated your car is.

Your Mercedes Benz really needs what is called a star tester hookup. Star tester is 26,000 dollars and it takes years to learn how to operate those things. So you are most likely going to have to go to a Mercedes professional.

The technician is going to need a star tester if they are going to work on that system because it’s very complex. I have a star tester, and to tell you the truth, every time I end up working on one of those systems I generally never end up fixing them. Because when I tell a customer "here’s what we’ve got to start out with, that’s going to cost you 2500 dollars," they just say "ugh" and they live with it or get rid of the car. If you’d like, a technician from YourMechanic can diagnose your ABS light issue and let you know if there are any more practical repairs.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

What others are asking

service engine soon

There is a TECHNICAL SERVICE BULLETIN for the problem and need to reprogram the PCM to a new level. The code is for a cam sensor signal being misread by computer and this TSB needs to be done before replacing...

Car is losing power and shaking

Hello. Your intuition is correct. Your vibration is caused by a failing "flex disk", a large rubber and steel "doughnut" which connects the transmission and driveshaft, and acts as a u-joint to allow flexing as the engine and transmission move...

Check engine light and low idle

What you are describing sounds like a dirty or failing idle air control valve. The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and...

Squeaking noise in brake pedal

If your brakes are squeaking, this can be caused by a number of different things. The brake rotors could have a surface finish that no longer promotes quiet braking. The brake rotors should have a criss-cross looking surface finish to...

Mercedes 2006 R350 not starting.the vehicle was not started for 20 days.road side assistance visited and they said battery is good

Hello, thank you for writing in. In addition to checking the battery, you will want to make sure the battery cables are clean, dry, and tight. When the cables or ground connections are loose or corroded, they are likely going...

How much to install rods and pistons

Hi Kent. Thanks for contacting us today. Unfortunately, internal engine rebuild service is not one our mobile mechanics offer. Installing new pistons, rings, connecting rods and others requires machining the engine block first, which is something that should be done...

What is causing my engine misfire?

Engine misfires can be caused by a list of problems, but there are a few suspects that occur more than others. Generally, misfires are caused by either a spark or fuel issue, or in some cases a combination of both....

Car will not turnover. Just one click when the key is turned. All electronics (radio, lights, etc.) are working.

Hi There, Generally, when turning the key produces one single click sound, this often times indicates you may have a faulty starter solenoid. A faulty starter solenoid will generally produce a clicking sound when turning the key. The starter solenoid...

My car is vibrating during acceleration

Hello. There are a few things that can cause this. The most common on your vehicle is either a bad engine mount or CV axle. I start by making sure that the Check Engine Light is not on. This lets...

Related articles

Symptoms of a Bad or Failing ABS Speed Sensor
Common signs include the ABS Light coming on, decreased stopping time, and less stability under icy or wet driving conditions.
A Buyer’s Guide to the 2012 Mercedes-Benz CLS-Class
The The newly redesigned 2012 Mercedes-Benz CLS-Class has transformed it from a more practical and elegant vehicle to one that is noticeably sporty with a bit more aggression. Designed for the affluent who want both performance and sophistication, while also...
Is It Unsafe to Continue Driving a Vehicle with Broken Wheel Speed Sensors?
Car wheel speed sensors are an important safety feature. It helps the ABS system work when you need to make an emergency stop.