I've recently ran across a trouble code that indicates the quad driver module, and after searching through the forum, I found very little that addresses this code. One thread addressed the evaporator purge solenoid, and stated that that was what the module had to do with. Researching further, I found it described as the ECM controlling 4 different modules; the egr valve,, probably the evap purge solenoid, TCC? (don't know what it is), and maybe another? If this code comes up (in my case code 26 on a 93 Olds Achieva) it seems one would have to check all of these components or sensors. If anyone could tell me what triggers this or if it's important to the performance of the car, I would much appreciate it. I've searched the net and there is not much info on the quad driver module. One minute my car runs like crap (gotta put the pedal down to go 35; engine is sporratic and RPM's are hi; no power) and the next minute it runs fine. I'm not sure but I'm wondering if it might be a problem with a sensor or module or the ECM itself. The ECM in the car now looks like it came from a salvage yard. Any info on this would be appreciated greatly.
