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If a quad driver has gone bad it is necessary to replace the ECM. After replacing the ECM, drive the car on a bumpy road and note whether the check engine light comes on. If it does, fix the problem or you end up with a repeat QDM failure.

== == == == There is no such thing as a quad driver module. There are quad DRIVERS in the ecm.

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โˆ™ 2007-10-14 13:24:10
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Q: Where is the quad driver module on a 1989 Buick 3800?
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