I've becomeused to the orange glow of my check engine light but out of curiosity I ran the codes on the car and one was the O2 sensor and the other was the "quad driver." Anyone have a clue what the quad driver might be?

What year and model?





Edit: I searched your posts and found you have a 1992 SL





Quad Driver is built into the PCM of the vehicle. To correct the concern the PSM would need to be replaced.Edited by: STLWACO

Nonsense. Quad driver output fault is a generic code that covers a bunch of stuff that share a single "flag". A problem with any one of the systems hanging off of the this circuit will set the same code.

I'm yet to see a single quad driver output fault require a PCM replacement.

IM me and I can share the sometimes gory details of troubleshooting it, or search for quad driver in this forum and you should find a post or two by me concerning troubleshooting this code.

Based on age of car, I'll blindly guess your EGR needs cleaning.

Derf

Thanx for the help! I looked at some of your old posts and it looks like other people fixed the problem just by cleaning the EGR, so i'll give it a try

Attachment 2096

Folks,

I should have been more specific in my response -- indeed, the quad driver is an integrated part of the PCM. Simply pointing out that getting a quad driver related code on a Saturn S car
almost hardly pretty much never ends up upon proper diagnosis</span> to be the quad
driver itself that is the problem.

In theory--sure--could happen -- and indeed you'd need to replace the PCM.

In practice --
yet to see it.

Sorry if I came off a bit harsh -- I had a shi*t day at work.

Ultimately -- I hope you problem will be solved with our assistance.

Derf

off topic, but curious... what program is pictured in the screenshot? Is it just used for referencing automotive jargon?