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What's a Quad Driver Module?

Tiny
CREATOR AND JUDGE
  • MEMBER
  • 1995 OLDSMOBILE ACHIEVA
  • 68,000 MILES
I recently had the engines malfunction light to illuminate; I took it to an autoparts store and had it diagnosed. The code said DTC 27 and DTC 28. When I looked inside of the repair manual it was described as Quad Driver module 1& 2 but I dont know what it's pointing to.


Help me too understand the code: please!
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Wednesday, July 4th, 2012 AT 3:02 AM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,873 POSTS
That's the high-current transistorized switching circuits that drive the ignition coils or injectors. Typically those are inside the Engine Computer but on some GM ignition coil packs they are built into that.
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Wednesday, July 4th, 2012 AT 6:18 AM

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