Hello All,

I have been out for the LS game for many years , but I have recently been able to pick up a nice C5Z. The issue is that it will randomly it will turn on the "Stability Control Service Soon" light and will stay on until I cut the car off for some time. I was aware of the issue prior to purchase, but in my research it seems it has something to do with the size of the wheels and tires. It is currently sitting on 18x9.5 fronts and 19x11.5 rears with 275/35/18 and 305/30/19 Nitto Invos. Is anyone else running these exact tire sizes and is this truly the issue? I looked at tire heights and it seems the current setup is .6" difference from front (25.6") to rear (26.2"). Is this not enough? I was thinking about going to 305/35/19's Nitto NT-05R's in the rears hoping this may fix the problem.

Thoughts?

Thanks!
Anthony

 

Have you pulled the codes? Pull the codes using the dash buttons and post. That will give us an idea what is going on.

 

Awesome, thanks for your help. Looks like it is throwing a few codes but only 2 for TCS

C1287 H
C1226 H

Here are the others
BO-RFA V1255 H
A6-SCM B0851 H
A1-RDCM V1064 H
A1-RDCM B2285 H
A1-RDCM B2283 H
AO-LDCM V1064 H
AO-LDCM B2264 H
AO-LDCM B2284 H
AO-LDCM B2282 H

 

Several things you need to consider. The RDCM and LDCM modules are in both doors and the history codes indicate there were some high and low voltage issues with both of those modules. Although these are history codes and may have been generated by changing the battery if you don't know the history of the vehicle it makes sense to check them out. Since both of them are flagging the same problem it is probably something common to both doors which means you more than likely have a battery or some other main power issue going on that is not providing 12V to the two doors. Also the B0851 code indicates there was a problem with voltage levels in the left side seat control module. The V codes are ones I don't recognize.

Use the DIC to reset all codes and drive the car to set a baseline. If you get more voltage codes then resolve the electrical problem first.

The first thing to do is to make sure all grounds are clean and making good contact and then doing the same with all voltage lines. Make sure the battery cables are clean and have a good connection to the battery terminals and the battery ground cable is properly clean and attached to the frame.

Getting rid of the voltage issue may resolve the 2 ABS codes you have. If that doesn't get rid of the problem then look at them following the cleanup of the battery issues.

C1226 indicates a problem with rapid variations in the wheel speed signal at one of the wheels. Using some info from the 2000 FSM it is likely the wheel speed to look at is coming from the Right Front Hub.
Here is the FSM description: The EBCM detects a rapid variation in the wheel speed. The wheel speed changes by 16 km/h (10 mph) or more in 0.01 second. The change must occur 3 times with no more than 0.2 seconds between occurrences. A possible cause of this DTC is electrical noise on the wheel speed sensor harness wiring. Electrical noise could result from the wheel speed sensor wires being routed to close to high energy ignition system components, such as spark plug wires. The wiring for this signal goes across the front of the engine and if the ignition system has been modified or the wiring harness has been moved/damaged by a prior owner it is possible electrical noise could be causing your issue. However, on an old car like this I would suspect a loose right front hub. i

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. Since you don't have C1281 you don't have a phase disagreement issue with the sensor signals.

If somebody had the steering rack disconnected from the steering shaft and then the steering shaft was turned one complete revolution and then reattached to the steering column you could get this code. A lot of hack mechanics don't realize there is a correct position for the steering wheel and just because it looks straight doesn't mean it is. If the wheel alignment is out of adjustment this code can also be set. If the steering wheel is turned one way or the other so you are constantly driving with the wheel turned while driving on a straight road. If the steering wheel is straight but the rear thrust angle is way off a hack mechanic may have dialed in a lot of toe in one direction to make the steering wheel straight while the wheels are turned. This is a situation called dog walking where the car is actually going down the road sideways. If neither of those conditions aren't causing the code then it could be the steering sensor itself.

Your tire sizes don't have anything to do with it.

Bill

 

Thanks Bill. I know the previous owner just changed the battery before I purchased the vehicle. I will reset all the codes and see what comes back.

Thank you everyone for the help!