1995 Cadillac Deville base model, 135k
Recently the car has had the TRACTION DISABLED light popping up more and more frequently. At first it would come on then stay off for most of the drive. Now it comes on repeatedly while driving.
First codes I pulled from the CCC was IO32, which actually has been in the history since I've had the car last few years. There is also a T072 and T077.
I removed the harness plug from the ABS module and cleaned and inspected. First drive out the light stayed off so I thought I had it licked. Next drive it came on with a vengeance.
Today I hauled out my Tech II and pulled these codes from history:
B1022 IPC Dimming Port
B1033 Loss of SIR serial data
And these current codes from ABS system:
C0072 IPC Serial Data Line Malfunction
C0077 PCM Serial data malfunction.
There are a couple other quirks which may/may not be related. Sometimes during the same the dash HVAC would stop blowing. Literally the fan would just stop...then it would just as mysteriously restart! Checked the blower connection and it was clean and unmelted. It hasn't done it since the weather turned cool and I'm not using AC consistently. The other weird thing: This car used to average 22mpg on the highway. The distributor wiring rotted out and I had to put a new distributor in it. Timed to factory specs (in fact, I've double checked it twice). Since putting the dist in, I can never get over 18.1mpg. Maybe coincidence? I've always used premium.
Anyway, sure could use some input on where to go with this one. Sounds like IPC failures may be common on these?