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Discussion Starter #1
Hi all
well, i was just cruising on the hwy on saturday, and i got the SERVICE ACTIVE HANDLING... and SERVICE VEHICLE on the dash... and the little light stayed on the dash, and i couldn't put it in COMP mode.

when I got home, i parked the car for a few hours, and then went for another drive, everything was ok, no messages.

This morning, i take it out... and i get "ACTIVE HANDLING WARMING UP" and "WARMING COMPLETE" .... i never had this type of message before, but everything seems ok, i never really pushed it hard to activate the active handling or abs.

i checked for codes, and I have a C1287H steering sensor malfunction.

I did quite a few searches, i will check for loose connections and fried wires.... but this talk about a faulty EBCM scares me. How would i know if its the EBCM that is messed up. I have no warranty.

I did have a battery acid leak, that almost fried some wires under the battery and vacume hose that cured my P0140 problem. the dealer had repaired everything under the battery. Could they have messed up some wiring under the battery or something that would throw off this new code?
 

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DTC C1287 or C1288
Circuit Description
The vehicle stability enhancement system (VSES) is activated by the 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 ignition is ON.

Conditions for Setting the DTC
C1287
One of the following conditions exists:

The steering wheel position sensor is synchronized and the steer rate (speed that the steering wheel appears to be turning) is greater than 1100 degrees/second.
The steer rate is less than 80 degrees/second and the difference in the phase angle between Phase A and Phase B is greater than 20 degrees.
The 2 steering sensor signals (Phase A and Phase B) do not agree for 1 second. Under this condition, this DTC will set along with DTC C1281.
C1288
One of the following conditions exists:

Both Phase A and Phase B are greater than 4.9 volts for 1.6 seconds.
Both Phase A and Phase B are less than 0.2 volts for 1.6 seconds.
The difference in the changes in Phase A and Phase B is greater than 35.2 degrees for 9.76 milliseconds.
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.

Perform the Steering Position Sensor Test in order to verify if the steering wheel position sensor (SWPS) is operating properly.

Tests for the proper operation of the steering wheel position signal A circuit in the low voltage range.

Tests for the proper operation of the steering wheel position signal B circuit in the low voltage range.

Tests for the proper operation of the steering wheel position signal A 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 the proper operation of the steering wheel position signal B 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 for a high resistance or an open in the low reference circuit.
 

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:thumb: :thumb: You're fine. The active handling warming up message is normal. I'm not sure exactly what it is doing, but it is normal. As far as the code goes, since there was an H after it it means it is old. There is no need to worry about, unless you start experiencing problems. Clear the codes and if it happens again, you might want to get her checked out, if not you're good to go.
 

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When I start my car up and it is already hot and slowly cam out of the parking lot I always have active handling WARMING UP for an extended time with yellow light on. If I let my car idle a bit even if it is hot before leaving then I never get that message.
 

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Discussion Starter #5
well, i am getting this service active handling again. the only code i keep getting is a C1287H (i don't understand why it would be a "C").... when i turn off the car, and restart, everything is fine. However, the service a/h and service vehicle indicator will pop up the day later. The traction control is ok, but no active handling and no comp mode.

I did notice that this time, as i changed lane and slowly applied the brakes, when i let go of the brakes, the active handling activated on its own on the front right tire for a split second. it did not affect my driving/handling, but it just activated (i wasn't driving crazy or anything) then after that happened, the service active handling came on.

i guess i have to go to the dealer again...dammit..i fix one thing, and then another problems surfaces
 

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I know how you feel, i drive an 03 ZO6 and my traction, abs, and active handling all come on when i hit 90 mph on the highway and when i turn the car off and on it goes away. Everytime its at 90 and i had a similar mishap with the traction control when it activated when i was messing around in reverse and i tapped the brakes and it locked up on me but everything was okay i was just wondering why it would do that. I did the old switch-a-roo with the speed sensor harness' but that didnt seem to work i still get the same code C1226 FR wheel speed variation. So, im loosing it over here with this car too...oh and did i mention i bought my car used so i think the guy before dogged the car....anyways goodluck with your problem wish i could help..if i come across any info i'll let you know. :yeadog:
 

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I hit the tri-fecta (spelling???) yesterday at a DE. Got the Servive ABS, Service Traction Control, and Service Active Handling. Just for fun it is intermittent and when it does not come on at start-up it stays away for the entire ignition cycle, even when on the track. The Codes are 28-TCH C1214 C H, and A6-SCM B2605 H. I haven't had a chance to look them up yet, so I don't know what they mean.

Brakes feel fine, but no ability to select competitive mode when code is current.
 

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I hope this can help you out with your problem kmagvette, here is what your code reads and if you need further info just go to www.obd-codes.com. Codes are a pain :flaming: ...haha..Good Luck!!

DTC C1214 System Relay Contact or Coil Circuit Open and B2605-B2607 Seat Position Sensor Circuit
 

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Code c1288H

I just got my car fixed the problem was moisture on one connector location was by the battery, pull them and see if you have any moisture on them, they also reflashed the ABS on my car per GM.
I always got code c1288H cleared it and shortly it came back with c1288H. hope this may help some.
 

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Discussion Starter #10
ammatic said:
I just got my car fixed the problem was moisture on one connector location was by the battery, pull them and see if you have any moisture on them, they also reflashed the ABS on my car per GM.
I always got code c1288H cleared it and shortly it came back with c1288H. hope this may help some.
hey, thanks for the tip, i will check that out this spring when i take my car out of storage. I think that may be the problem, there is constant moisture around my battery area, my stupid battery was leaking again, and that may have caused the problem.
 

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My own experience is that these codes are directly tied to moisture, either from driving while it rains or sitting water in the compartment. My 01' absolutely hates the rain, and hates the high humidity in Fla. during the summer.
 
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