Hi Everyone! I have a 2003 LS1 with 8K miles and for about the past 3 years after the car has sat for a while the "Service Active Handling"
warning shows up on the screen. After I drive it a few miles and turn the engine off it goes away. Any ideas or suggestions. Or has anyone experienced this and what was the solution. Thanks, Anthony

 

We all have experienced this at one time or another.

Pull the codes and post them so that we can offer the best advise.

 

Thanks, I'll pull the codes and post them

 

The code is C1282 also while the code is displayed the ABS engages for a second...As I mentioned once I stop and pull out the key all is well...Thanks, Anthony

 

Weak battery from sitting so much.

 

Looks like you have an issue with the yaw rate sensor

Is the code a history (H) or current (C) code?

Here is the procedure for info

DTC C1282
Circuit Description

The vehicle stability enhancement system (VSES) is activated by the electronic brake control mdoule (EBCM) calculating the desired yaw rate and comparing it to the actual yaw rate input. The desired yaw rate is calculated from measured steering wheel position, vehicle speed, and lateral acceleration. The difference between the desired yaw rate and actual yaw rate is the yaw rate error, which is a measurement of oversteer or understeer. If the yaw rate error becomes too large, the EBCM will attempt to correct the vehicle's yaw motion by applying differential braking to the left or right front wheel.

The amount of differential braking applied to the left or right front wheel is based on both the yaw rate error and side slip rate error. The side slip rate error is a function of the lateral acceleration minus the product of the yaw rate and vehicle speed. The yaw rate error and side slip rate error are combined to produce the total delta velocity error. When the delta velocity error becomes too large and the VSES system activates, the drivers steering inputs combined with the differential braking will attempt to bring the delta velocity error toward zero.

The VSES activations generally occur during aggressive driving, in the turns or bumpy roads without much use of the accelerator pedal. When braking during VSES activation, the brake pedal will feel different than the ABS pedal pulsation. The brake pedal pulsates at a higher frequency during VSES activation.
Conditions for Running the DTC

The EBCM performs 6 different tests to detect a DTC condition. The numbers below correspond to the numbers in Conditions for Setting the DTC.

The yaw rate sensor bias test runs with the ignition ON.
The yaw rate sensor acceleration test runs with the ignition ON.
The yaw rate sensor circuit test runs with the vehicle stopped or with the vehicle speed greater than 45 km/h (28 mph).
The yaw rate isolation test runs with the following conditions:
The brake pedal is not pressed.
The ABS is not active.
The vehicle speed is greater than 5 km/h (3 mph).
The above yaw rate isolation test run with the VSES active.
The false activation test runs with the VSES active.

Conditions for Setting the DTC

The EBCM performs 6 different tests to detect a DTC condition. The numbers below correspond to the numbers in Conditions for Running the DTC.

The yaw rate bias is greater than 7 degrees/second.
The yaw rate input change is greater than 390 degrees/second/second.
The yaw rate input voltage is less than 0.15 volts or greater than 4.85 volts for 1 second.
The yaw rate error is greater than 10 degrees/second 30 times within a drive cycle.
The yaw rate error is greater than 10 degrees/second for 5 seconds. Under this condition, this DTC will set along with DTC C1281.
The yaw rate error is greater than 10 degrees/second with the vehicle speed less than 60 km/h (37 mph) and the acceleration pedal is pressed more than 25 percent of the pedal travel range for 1 second during the VSES activation. Under this condition, this DTC will set along with DTC C1281.

Action Taken When the DTC Sets

The EBCM disables the VSES for the duration of the ignition cycle.
The Traction Control and Active Handling indicator turns ON.
The DIC displays the Service Active Handling message.
The ABS remains functional.

Conditions for Clearing the DTC

The condition for the DTC is no longer present and the DTC is cleared with a scan tool.
The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids

The scan tool may display 2 additional characters after the DTC. Take note of the 2 character code and any other DTCs that are set. The 2 character code is an engineering aid used in order to determine the specific criteria which caused the DTC to set.
During diagnosis, park the vehicle on a level surface.
Check the vehicle for proper alignment. The car should not pull in either direction while driving straight on a level surface.
Find out from the driver under what conditions the DTC was set (when the DIC displayed the Service Active Handling message). This information will help to duplicate the failure.
The Snapshot function on the scan tool can help find an intermittent DTC.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

Tests for the proper operation of the circuit in the low voltage range.

Tests for the proper operation of the circuit in the high voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to ground.

Tests for a short to voltage in the 5-volt reference circuit.

Tests the bias voltage of the yaw rate sensor.

 

The yaw rate sensor is located under the passenger seat. Since I've not yet heard of one failing, first thing I would do is remove the seat itself and check for moisture under there, cleanliness of the connector contacts and so on.

 

DeeGee and dgrant3830, thank you for the extremely comprehensive and helpful response. I'll start checking and let you know what I find. Very much appreciate your help!! Anthony Avola, Lititz, Pa.

 

That's what that is under the passenger seat. I'm taking my interior all apart to get rid of weight. Don't want AH at all but I do want to keep ABS. So I guess I need to connect that back up.

 

I have had that in the past but only after it has set awhile. Once I shut it off and start it back up its gone. I won't have it again till I let it sit for a month. Lesson is don't let it sit..

 

Don't let it sit or put a battery tender on it because they suck down batteries while they sit. Then they throw all sorts of codes and act retarded when you finally get around to driving it.

 

It is rather important. Chevrolet already removed all the weight they possibly can to reduce weight and still keep it functional as a street driven car. Now if you want a racing car, different story of course but certain things need to remain.

 

Thanks guys for your help. Problem solved, I hope, low battery voltage from not being used. I gave the battery a full charge and WALA no warnings bells or whistles You're a great bunch, thanks for your help. Battery tender on the way. Anthony

PS: If you are ever in the Lancaster, Pa area look me up. We have some Great roads to test ones skill..Also hope to build a road course here soon (2.5 miles) on 100 acres so I can reduce my visibility from the law and have some fun with friends. Investors welcome

 

It's becoming a track only car, road courses. I'll have at least 200lbs out of it before I'm done. I didn't realize that was the yaw sensor, hadn't got to it in the shop manual yet. I'll connect it back up. No problem.

 

I'm having a problem with my active handling as well. I have a 2003 C5 z06 and my active handling message keeps popping up even after I clear the codes using option and fuel buttons on dash. My brake engages when going about 60-70 and it's starting to scare me. Any suggestions? Just bought it about a month ago and everything was fine until I took a 3 hour road trip last weekend.

 

99 - HVAC
- B0361 H
- B0441 H

Sometimes there is a third when it triggers the service vehicle soon icon in the same HVAC file. But it's only showing 2 as of now.

 

Ok I'll look for codes when that happens again and I bought the car as 275 35 18 on front 305 30 19 on rear. I believe the wheel is straight it's on a highway when it occurs and if I brake during the moment of it on the dash it will effect my abs.

 

Ok so I was driving to work today and she kicked some new codes right after the service active handling message came on. 10- PCM p0155 c
28- TCS C1287 H C hopefully this gives you more of an idea. It didn't lock the brake this time thankfully.

 

The sensor from what I have read means pulling the steering column apart correct? And yes any info would be greatly appreciated on anything minor I can try before dishing out bigger $.

 

Yes to replace the SWPS the steering column has to come out. The part costs about $65.00 at www.gmpartshouse.com. It takes about 2.5 to 3 hours to do the work. Just replaced mine in my 04 a year and a half ago. Same symptoms and we where about 1500 miles from home when it started acting up.