Quad driver?
Joined: Jan 2006
Posts: 16,539
Likes: 18
From: Purgatory, Pennsylvania

Yep 56 is quad-driver module #2 circuit. But I'm a Northstar guy. So I'll let a gearhead go from here. You can see all the OBD1 codes anytime here within the forum,
https://www.gmforum.com/t278820/
https://www.gmforum.com/t278820/
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riotact
Performance, Brainstorming & Tuning
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Jun 22, 2003 07:11 PM






