As Max said, you need to find out what items are being driven by the Quad Driver that set the code. This code usually sets when there is a voltage fault on a particular Quad Driver, due to a bad relay or solenoid, or whatever is being run off that driver. It could be a TCC solenoid, A/C relay, EGR, lots of possibilities, however, since you have code P1406 - EGR Valve Pintle Position Circuit, that helps to narrow it down somewhat. Before replacing parts, do as suggested, & check the wiring diagram for Quad Driver (QDM) 1 & 4.
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Does anyone know what a QDM is??
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The PCM controls most components with electronic switches that complete a ground circuit when turned on. When the switches are arranged in groups of 4, they can independently control up to 4 outputs and are called “Quad Driver Modules” (QDM). When the switches are arranged in groups of 7, they can independently control up to 7 outputs and are called Output Drivers.Hence the term
“Output Driver Module” (ODM) Usually, not all the outputs are used
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