GM Code 26 Quad Driver Fault

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CODE 26 - Quad Driver Fault

Trouble Code 26 indicates that the quad-driver is malfunctioning.
QDM symptoms:

• Cooling fan(s) inoperative
• Poor drivability due to 100% canister purge.
• Coolant light "ON" all the time, "OFF" during bulb check.
• EGR inoperative - Code 32.
• TCC inoperative

This problem can be caused by:

• Short to 12 volts on the control circuit by a shorted component.
• Faulty ECM.

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