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Re: 94 Lesabre - Code 1650 QDM2 failure, weird problems...
The qdm drives certain high load solenoids such as the TCC, egr solenoids, evap solenoid and several others, one is overloading the driver and the circuit in pcm opens for self protection, The faulty wiring or device in that driver circuit must be isolated and repaired .this may be related to recent work you had done.
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