Is anyone from Chevrolet reading this who can help or has anyone encountered this and discovered the problem????
2009 Coupe - LT1 - Automatic
Completely stock - factory wheels, tires (at proper pressure), NO aftermarket tune and NO engine mods
The steering wheel does not get moved in/out or up/down as I am the only driver.

Shortly after 15,000 miles the Active Handling became very sensitive and began activating in turns when completely unnecessary and on roads driven previously with zero issues. It misbehaves at the speed limit and below. Spirited driving is NOT required for it to misbehave.

The DIC message is "Active Handling", not "Service Active Handling".

Dealer code reader shows no codes. A snapshot with the dealer code reader while it was misbehaving on a test drive with dealer service manager in the car was sent to GM for review. GM told dealer the info shows no malfunction.

This is all after the dealer replaced the steering gear which they thought was the problem but it has not helped.

Dealer seems to have given up and has referred me to GM service phone line. This has been frustrating so far because the two people I've spoken with have admitted to NO Corvette or technical knowledge and the district rep said she will talk with the dealer who already doesn't know what to do.

Thanks in advance for any help.

 

Send a PM to Chevy Cust Svc here on the Forum, see if he can get some help for you.

http://forums.corvetteforum.com/1577690075-post9.html

 

First off, the system can when operating correctly activate even though you aren't driving fast or in a sporting manner. All it takes is for the car to yaw more or less than the amount of steering you are inputting with the steering wheel and for a certain G load (Lateral Acceleration) to be exceeded.

That being said Active Handling systems sometimes do not behave as expected due to the need to allow for some tolerances in the electronics. When they do this no code will be set since the system thinks it is OK because it has passed its built in self test. A mechanic looking at the numbers on a Tech 2 may not recognize when such a condition exists.

As I said above, AH responds to steering input, yaw error and lateral acceleration. The steering gear has nothing to do with it other than it turns the car when you turn the steering wheel. The steering sensor provides the system with the steering input, the yaw sensor provides the amount of yaw the car is experiencing and the lateral G sensor provides the G load. The EBCM reads all of these signals and inputs the values into a formula that determines what has to be done. The steering sensor is located at the bottom of the steering column and the yaw/lateral G sensors are located in one module behind the center IP. The EBCM is located in front of and below the alternator.

If your wheel alignment is off the steering sensor can give an incorrect value due to the steering being turned to compensate for the alignment problem. This could make the car think it is supposed to yaw more or less than it is based on steering input. So when you turn the steering wheel a certain way you are increasing the value of the signal even more and the controls act to correct the increased yaw error. This is the first thing the dealer should have checked. The steering sensor itself could be right on the margin of being bad and due to tolerance issues may not work well with the rest of the system. The same could be said for the EBCM. It has to evaluate the signals from the 3 sensors and if its system is off center for some reason or other the same thing could happen. The yaw/lateral G sensors could be sensing the wrong thing. This could be due to module problem but it could also be due to somebody playing around behind the center IP and moving the module. Has anybody been working in that area. Replacing a radio, adding some electronics, just taking a look?

Bill

 

Bill,

No, no one had been behind the instrument panel before the issue started. Forgot to mention that it misbehaves in both left and right turns.

Thanks for the informed response.

Neil

 

Crazy. I've always suspected mine of somewhat malfuctioning because I CANNOT get it to come on in the 70k miles I've driven this car, and i drive it pretty hard.

Now I have the dreaded svc active handling, traction control, ABS though which I need to fix. Just have to figure out which wheel sensor it is that is acting up.

 

If you go to Autozone or Advance Auto and if they use a scanner that can read ABS codes you can quickly find out which sensor if the problem is due to a sensor. No guessing required. Once you have the code you can use the diagnostic procedures in the Service Manual to isolate the problem. Codes don't tell you what is bad they just tell you where to start looking for the problem. If you don't have a Tech 2 to help with the diagnostics you can usually jury rig some wires to get to places where you want to make measurements or wires to short inputs to ground to make the system do something.
Bill