[Update] SES Light in '90 1500: Code 32?

[Dave95C4]

Hi all,

I posted a while back about my '90 GMC's SES light illuminating after 15+ minutes of 55mph or above travel without any sort of change in the way the truck runs.  Turns out, it's running a Code 32.  The book I have says this is the EGR system, but do any of you have a better idea of what this could be?  I'm still thinking an O2 sensor, but I could be wrong.  Any input appreciated!!

 

Dave

[00chevy5.3]

I had an 89 that had that same code 32. Tried everything egr,o2,....etc. It would even come on the same way yours does. If I would just drive normally it would come on but if I was driving it hard it would never come on. The only thing I can think of is when I installed headers that caused it some how It seemed to have started right after that and would not go away up until the day I sold it.

 

Chris D.