Grable

Need some help!

My 2000 Vette has constant display of Service ABS, Service Active Handling, and Service Traction Control. All the messages started at once. The only experience with Services messages some time prior was "Active Handling Warming Up" message displayed occasionally.

I am attempting to understand whether one connection or problem would cause all three Service Messages to appear. And, what is the most logical approach to sequentially check for the problem.

Can anyone tell me the least complex issue that could cause the problem to the most complex (Example: fuse to pickup sensors?) and the location of same so I might begin the cumbersome task of finding a solution?

Your experience and help would be appreciated.

FRISKY

What codes are you getting?

yellowvette837

I would guess no codes...
I get these message frenquently (they come and go) and never any codes

simpleman68

It would help if you listed a few basic details about your car.
Year
Mods
Tune

I've seen those messages from bad pcm's, bcm's and goofy tune issues that throw off communications from modules that mess up torque management.

More details will hlep people help you more accurately.
Scott

ronwc

I had something similar with mine some months ago. It was just a bad ground. Check and clean the two grounds behind the headlights on the chassis -

Grable

I have not attempted to display the codes that are causing these Service Message on the console.

I have a C5 2000 Convertible with approximately 45,000 miles on it. No special mods installed. Just a stock C5.

Would looking at the specific codes logged define the problem more specifically. If so, how does one go about displaying the codes from the console buttons.

I will extract the codes and post them on this thread for futher help once I get the instructions to proceed.

Thanks,

ANTIVINUM

I get the same error. I think the code is a 1226. I was told there is a sensor in my right front wheel hub that is going on the fritz. Some thing about how the T/C monitors the difference in wheel speeds.

Bill Dearborn

ABS, T/C and AH all use the wheel speed sensors, the EBTCM, the steering position sensor and probably a few other items I have forgotten. Codes only point you in the direction to look and in a lot of cases only indicate a symptom. Once you have the codes you have to apply the diagnostic procedures indicated in the service manual for each code. Poor grounds, loose wheel speed sensors can cause these problems. As with most electonics poor connections cause most of the problems.

Bill

Mighty-Mouse

Like Bill said the best we can do is point you in the right direction.

But if you have all lights on then it will be, in order of likely-hood:

1. Wheel speed sensor or connector
- debris on the sensor head
- a short or corroded connector
- physically damaged

2. Tone wheel - if the air gap gets to big it will throw a code
- wear has increased the amount it can move around

3. The main ABS pump
- dirty fluid
- just plain broke

4. The valve block -BPMV
- dirty fluid
- sticking valve
- damaged seal
- shorted solenoid

5. ECU - EBTCM

Possible ,but unlikely:

- steering wheel angle sensor - the ABS would still function
- secondary TC/AH priming pump (which is in the ABS pump body) - the ABS would still function
- throttle body sensor - the ABS would still function
- brake pressure sensor - the ABS would still function
- sensor cluster, yaw sensor and lateral accelerometer - ABS and TC would still function


How it works:

For ABS only (4-channel):
- wheel speed sensor
- tone wheel (a toothed wheels that the sensor uses to determine wheel speed)
- 4 valve ABS block
- non-priming pump (means it will not produce enough pressure on it own, only works when the pedal is depressed)
- ECU

Added for TC (minimum):
- 8 valve block
- secondary priming pump
- throttle position sensor
- brake pressure sensor
- relative velocity sensor

Added for AH:
- 12 valve block
- upgraded priming pump (needs to be very responsive)
- steering wheel angle sensor
- yaw sensor
- lateral accelerometer

- some cars use a longitudinal accelerometer
- some cars use a load (or ride height) sensor

Grable

Mighty-Mouse

Great reply. Gives me some insight as to where to begin. The C5 is out of warranty so don't want to be at the mercy of the dealership.

Will attempt to locate the problem and resolve. At last resort, I always have the GM service as final backup.

If and when I find the failure, I will report back.

Thanks,

ecook

I get the service active handeling message sometimes. If it goes away when you turn off the ignition and restart the car should I still be concerned???

C3vette75

I had the same message on my 2001 two years ago. I took it to the dealer and had them do the following. So far no problems.

Re: TSB #01-05-25-004 (WP) 7:06 PM 6/28/2002

Only lists the TSB for 01 and 02 model years.
But here you go anyway:
Yellow: Traction Control/Handling Lamp On, Drivers Info Center Displays Service Active Hndlg (Handling) (Repair/Reprogram ABS Module) #01-05-25-004
Yellow: Traction Control/Handling Lamp On and Driver's Info Center Displays Service Active Hndlg (Handling) (Repair/Reprogram ABS Module)
2001 Chevrolet Corvette
Condition
Some customers may comment that the "Yellow" message, "Service Traction Active Handling", is illuminated on the Driver's Information Center.
The technician may find chassis DTC C1288 -- Vehicle Stability Enhancement System (VSES) Steering Wheel Sensor Phase A and B. When this code is set, the VSES is turned off; ABS and TCS remain operational.
Correction
Verify the Techline equipment has been updated with TIS software 20.5 or newer. If it has not been updated, do so now. This software was broadcast to dealerships on January 1, 2001. CD #1 for 2001 was mailed in early January, 2001.
Install the scan tool to the vehicle.
Enter the chassis applications.
Select F1: ABS/TCS/VSES.
Select F4: ID Information.
Select F1: Controller Information 2.
If the DE Calibration P/N is 12212175 (this calibration went into production 11/30/00 after VIN 15114788), refer to the Service Information for diagnosis.
If the DE Calibration P/N is 12204887, it will be necessary to update the ABS module.
Important
The update cannot be performed until fuse #25 (Body Control Module-Ignition 1, Instrument Panel Control) 10 amp is removed from the Instrument Panel fuse block which is located on the passenger's side of the vehicle (under the Instrument Panel and under the toe board).
Without removal of the fuse (prior to requesting information), unsuccessful reprogramming may occur.

Power down the scan tool.
Turn OFF the ignition and remove the key.
Remove fuse #25, (Body Control Module-Ignition 1, Instrument Panel Control) 10 amp.
Using the scan tool, perform the usual SPS reprogramming of the ABS module.
Power down the scan tool.
Turn OFF the ignition and remove the key.
Replace fuse #25, (Body Control Module-Ignition 1, Instrument Panel Control) 10 amp.
Verify the ABS DE Calibration P/N. If it is not P/N 12212175, redo the SPS programing procedure listed above.
Clear the codes from all the modules.
Warranty Information
For vehicles repaired under warranty, use.
Labor Operation
Description
Labor Time

N8520*
ABS Module - Reprogram
0.6 hr

*This is a unique labor operation to be used only with this bulletin. It will not be published in the Labor Time Guide.
ms.

Mighty-Mouse

You really do need to pull the codes to figure out the exact area.

If it's the pump of valve block there really isn't any way to test it in your garage. You'll need a hand-held (ABS scan-tool) to activate and test those items.


For the wheel speed sensors, check at each corner that they are not lose, that the wire is in good shape and the connector is not damaged, lose or the pins corroded. It's easier if you remove the wheel. If all looks good then you can test the current.

The wiring harness is connected to the EBTCM



For the tone wheel, take off the wheel and the brake rotor.
Check to see it's not lose or if teeth are missing.

Typical, but not Corvette:






If you really want to DYI And you're related to Bill Gates:
http://www.advancedsyst.com/ASC1561.html

noelc5

I had this same problem. It was a ground for my RDCM. Check your grounds.

There are two grounds up front behind the headlight assemblies and there's supposedly 2 in the rear. I was only able to find one, which was on the outside of the rear frame behind storage compartment. If that's not clear lemme know.

To clean mine I backed the nut off and hit the nut and frame with 800 grit and tightened the little fella back down. Best of luck!

BQuicksilver

Watch this wire to the EBCM to be sure it doesn't touch the belts. Mine did.

WickedC00L

Grable, I had the same exact problem the other morning, that's how I found your posting here. I have a 2002 Corvette I just bought last week. And I was able to fix the problem relatively easily. Unhook the battery terminal for about 30 min. That will reset the computer. If the lights don't come back on, you'll know that a sensor just threw a misc. code. It might have been dirty, or the wind blew across it funny or something. (You know how these sensors go) If the warning lights do come back on, then you should obviously investigate further. In my case, it fixed the problem right up.

Crap like that used to happen to my 2002 Camaro every once in a while. The check engine light, or some other light would come on. After I took it to the dealership the first couple of times, and nothing was wrong, they suggested that I first try reseting the computer by unplugging the battery. If it is indeed an actual problem, the lights will come back on. Then you worry. I'm interested to know if this fixes the problem. - Ryan

KyleDreher01

So I changed out my multi function switch and now my Service Traction System light is on? Any ideas?

KyleDreher01

Thanks, i will get the codes tomorrow!....is it possible i bumped or knocked the steering wheel position sensor connection loose causing this problem?

tblu92

I agree with most all posts concerning your messages
To help you understand what is causing the messages---1st realize that both the "traction control system" and the "ABS braking system" uses data from your wheel speed sensors
The TC system uses the speed sensors to prevent the rear wheels from spinning on a hard launch
The ABS system uses the wheel speed sensors to control the wheels from skidding on a hard stop
So if you are getting active handling or TCS or ABS warnings all at once it points directly to your wheel speed sensors---This is very common--sometimes even driving on a rough road or over railroad tracks will momentarily cause a wheel speed sensor fault
Most often the fix is to check each sensor pigtail at every wheel---They often get fouled with rain or dirt---Make sure each sensor pigtail is clean--Clean them with Brake Cleaner---plug them back in----Also make sure all the wires to the sensors are "GOOD" and not frayed or broken---Check the reluctor star wheel on the brake rotors---They look like a set of gears that connect to nothing however they report the wheel speeds--
Sometimes you will get a rock pebble stuck in the teeth or some other debris---this wil again cause the sensors to not read corectly

KyleDreher01

I will clean all those and get the codes. I just didnt think it would be the tire sensors because I changed the Multifunction switch then put everything back together and the Service Traction System Light came on before I even drove it?