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The quad driver is an integrated circuit in the PCM that turns actuators on and off. It is also a safety valve for the electric current in those control circuits. When the quad driver is overheated because of an electrical short in one of those circuits it shuts down the circuit and sends a signal to the main processor in the PCM to illuminate the Malfunction Indicator Lamp ( Service engine soon, or Check engine light). It is designed to help prevent PCM failures caused by shorted solenoids, actuators or wiring.

A code reader will give you the number code and then that can be translated to a DTC description. Example: Quad Driver Module (QDM) B fault is a description. The next step, before buying all the parts that Autozoo has to sell is to have someone diagnose the circuits and components involved. Follow the manufacturer's diagnostic flow chart using the proper tools and equipment to save you money and downtime.

Quad Driver

"not" is on the right track. A quad driver is a part of the engine module that controls 4 circuits. You would have to find a chart that shows you what is controlled by the driver. One of the solenoids on that circuit is probably either shorted or has an open circuit. There are a couple of solenoids in the transmission that could cause the code to set. You might have to take it to a shop to get it repaired because you could wind up throwing a lot of money at the problem before you get it fixed.

A quad driver is a circuit in the pmc that controls outputs, solenoids for example. The code sets from a failure on that circuit. You need to look in the manual to figure out what that quad driver controls and test those items to find the failure. After you've identified and repaired the cause you may or may not need to replace the pcm, just depends if the failure damaged it or not.