My active handling system on my 04 coupe has been a problem for sometime. First it was the tranny speed sensor-replaced. Then both front wheel sensors ($1000 ouch!). Now My cruise control is kicking out intermittantly again.

But yesterday I'm going down the freeway and the car starts to shudder for a moment, a bit of shimmy, and the DIC says "ACTIVE HANDLING". Scared me a bit. No error codes on DIC.

I turned the crap AH system off for now. Guess I should go back to the mechanic? Or turn the craps AH off every time I get in the car?

 

What codes is it throwing?

 

I'm thinking one of the wheel speed sensors, wiring isn't working so hot to one of them. The Active Handling cuts in because its thinking one of the wheels isn't spining at the same rpm as the others. That will also turn off the cruise. Check the pins for corrosion, clean/repair, then try again....but be very careful.

 

No codes, that was the first thing I checked. trust me a shuttering vette at 80mph doesn't give you a warm and fuzzy feeling.

I dropped it off at the shop.

 

Aint that the truth. It happened to me also. I turn AH off now. It just keeps me from driving like an idiot now

 

Good luck at the shop.

I think DGrant nailed it. His synopsis makes perfect logical sense if you think it through. I bet the shimmy you feel is A/H applying the brakes.

 

I can see why that would put you off

Sounds like a good plan to me particularly if its not throwing codes.

 

OK the mechanic was clueless, as you guys surmised. So I brought it home. guess I'll see if I can find the glitch.

Anyone have a list of all the active handling connection locations and suggestions as to how to clean them (as a start)?

 

First, all four wheel speed sensor connectors. They are exposed to the elements which is the primary source of issues. The EBCM in the engine compartment...but I would think you would be getting codes if it was the source. The steering wheel position sensor at the base of the steering column but you really can't do anything with it other than replacing it and that is some work to get too. You would also get codes from it as well. The accelerometers are under the passenger seat. Now this area needs looking at if the seat was being moved a lot.
I think you would be wise to PM Bill Curlee at this time and ask questions. The other major items involved would be the PCM and BCM although I really don't know which is handling the active-handling. Always disconnect the battery when cleaning contacts. Since you mentioned that you replaced the front bearing hubs already, I would start there then go to the rears. Do them all carefully.
As for testing, I have no idea what would be safest other than putting it on a dyno rack. You may want to consider taking the car to a good Chevrolet dealer or a Corvette specialist who can diagnose this for you with a Tech 2. It would be by far safer that way rather than simply trying to save money looking for the cause yourself. You decide what is best for you.

Never mind... I see you have this same thread running in the Tech section which is better and Bill has already replied to you.

 

Good advice I'd say

If this is affecting car handling it probably needs a qualified tech to take a good look IMHO. I have a nuisance AH problem but if doesn't put the car at risk.

 

I telling you, DGrant nailed it earlier in the thread. It makes logical sense, which is a lot considering some of the stuff with this car.