blue98ls1 Posted April 20, 2018 Report Share Posted April 20, 2018 Need some help. I have a 2004 Cts-V. It has had the traction control, abs and brake light come on while driving over 45ish since I bought it. Under 45 the radio display willl occasionally flash that the stabilitrak is enabled and go off. Once you hit 45 it says service stabilitrak and all those lights come on. I have a Tech 2 style scanner that says it has a code C0281 dynamic rear proportioning. And also a Left and Right front wheel speed sensor code. I have cleared all stored codes and these keep coming back. I have replaced ALL 4 wheel hubs. The rear passenger CV axle. It has brand new pads/rotors. Calipers are in good shape. I have replaced the PITA brake switch under the brake pedal. The dealership replaced the front brake hoses under warranty last week. I have replaced all broken light bulbs including the third brake light panel on the rear end of the car. And these codes persist. What am I missing? Quote Link to comment Share on other sites More sharing options...
STEVE-O Posted April 20, 2018 Report Share Posted April 20, 2018 Check your speed sensors with the tech 2 if you can to see if they read accurately at all times, also don’t quote me but I believe there was also a pcm update like a tsb for the earlier ctsv but I no longer have direct access to check that for you On those is the wss separate from the hub assembly? If so that is right where I would start Quote Link to comment Share on other sites More sharing options...
blue98ls1 Posted April 20, 2018 Author Report Share Posted April 20, 2018 These are the bolt in hubs with sensors. So at the very least those codes should have disappeared, but not my luck. Going to put it back on the lift and re-seat the ABS module connections after lunch. Quote Link to comment Share on other sites More sharing options...
zeitgeist57 Posted April 20, 2018 Report Share Posted April 20, 2018 Quote Link to comment Share on other sites More sharing options...
caseyctsv Posted April 20, 2018 Report Share Posted April 20, 2018 This may be a dumb question, but have you checked to verify the tires are stock size all the way around? Quote Link to comment Share on other sites More sharing options...
Cordell Posted April 20, 2018 Report Share Posted April 20, 2018 Straight from GM service information, "This DTC is for information only. As an aid to technician, this DTC indicates that another DTC exists that fails DRP". So if there are no other DTCs set, or setting when you drive it, then it's either a programming issue or the EBCM is crap. Edit: there's also a bulletin for the brake lamps stuck on can cause it. Edit edit: did you relearn the brake pedal position sensor after replacement? Let me know when you want me to bring my programming tools home and we'll sort it out. Quote Link to comment Share on other sites More sharing options...
Not Brian Posted April 20, 2018 Report Share Posted April 20, 2018 This may be a dumb question, but have you checked to verify the tires are stock size all the way around? I asked this last time, and she said they are.. but it still sounds like they aren't. Quote Link to comment Share on other sites More sharing options...
MrMeanGreen Posted April 20, 2018 Report Share Posted April 20, 2018 They are, 245/45/18. Quote Link to comment Share on other sites More sharing options...
blue98ls1 Posted April 21, 2018 Author Report Share Posted April 21, 2018 Straight from GM service information, "This DTC is for information only. As an aid to technician, this DTC indicates that another DTC exists that fails DRP". So if there are no other DTCs set, or setting when you drive it, then it's either a programming issue or the EBCM is crap. Edit: there's also a bulletin for the brake lamps stuck on can cause it. Edit edit: did you relearn the brake pedal position sensor after replacement? Let me know when you want me to bring my programming tools home and we'll sort it out. Let me know whenever you feel like looking at it. I used the scanner to relearn the brake sensor and it pops stabilitrak as soon as it finishes the procedure. Says it was successful but stabilitrak instantly pops on. We unplugged the harness to the ebcm and reconnected it. No difference. Quote Link to comment Share on other sites More sharing options...
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