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I am getting this when I scan my 1994 cutlass cruiser (P1650 QDM2). Can someone help me with this code?

Full code is P1650-QDM2-failure. I know QDM stands for Quad Driver Module but what is the 2 for? Does that tell me which one of the controled units is causing the bad reading? Where do I start?



6 Answers

  • 1 decade ago
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    1994 Oldsmobile Cutlass Ciera Cruiser V6-3100 3.1L MFI VIN M

    Vehicle Level Powertrain Management Computers and Control Systems Testing and Inspection Diagnostic Trouble Code Tests and Associated Procedures P Code Charts P1650

    DTC P1650


    The Powertrain Control Module (PCM) is used to control several components such as those illustrated above. The PCM controls these devices through the use of a Quad-Driver Module (QDM) . When the PCM is commanding a component "ON," the voltage potential of the output circuit will be "low" (near 0 volts). When the PCM is commanding the output circuit to a component "OFF," the voltage potential of the circuit will be "high" (near battery voltage). The primary function of the QDM is to supply the ground for the component being controlled.

    Each QDM has a fault line which is monitored by the PCM. The fault line signal is available on the data stream for scan tool test equipment display on Tech 1. The PCM will compare the voltage at the QDM based on accepted values of the fault line. If the QDM B fault detection circuit senses a voltage other than the accepted value, the fault line will go from a "low" signal on the data stream to a "high" signal and Diagnostic Trouble Code P1650 will set.


    The engine is running.

    The PCM detects an improper voltage level on a circuit connected to QDM B.

    The above conditions met for 5 seconds.


    The PCM will illuminate the Malfunction Indicator Lamp (MIL) (Service Engine Soon) with a current DTC P1650 set. QDM B controls transmission shift solenoid A and B, Torque Converter Clutch (TCC) Pulse Width Modulated solenoid and three Exhaust Gas Recirculation (EGR) solenoids.


    Number(s) below refer to circled number(s) on the diagnostic chart.

    If a QDM related DTC is stored, diagnose that DTC first. The repair made to the related DTC will repair DTC P1650 also.

    This test will determine which QDM B control device has failed.


    Monitor the voltage at each terminal shown above while moving related harness connectors, including PCM harness. If the failure is induced, the voltage will change. This may help locate an intermittent condition. Check for bent pins at PCM and PCM connector terminals. If DTC reoccurs with no apparent connector problem, replace PCM.


    PCM is protected by an internal circuit breaker.

    PCM replacement is not necessary after repairing QDM B Quad driver controlled circuit or component.

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  • 3 years ago

    1994 Cutlass

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  • 1 decade ago

    your are correct the qdm is the quad driver module and the 2 is for the second controll unit

    start there good luck

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  • 3 years ago

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  • 1 decade ago

    call your dealer they should tell you they have a code book or try your local auto parts store

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  • 1 decade ago

    HOPE this helps you...

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