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International Automotive Technicians Network
Re: Code P1671
Posted to Technical Discussion Forum on 2/24/2020

P1671 is a Quad Driver fault. A Quad Driver is an electronic switch built into the PCM that the PCM uses to turn various electronics on and off. There is more than one Quad Driver.

The testing is to determine what has shorted, or open circuited that the spec... Login to read more.