Question about 1991 Oldsmobile Cutlass Ciera

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I have a 1991 olds cutlass cierra. code 26 quad drive module failure keeps coming back. where is quad driver module located? what can i do to correct it? also tcc curcuit fault. solenoid and wires have been repaired but tcc curcuit fault is still there. are they related?

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  • Anonymous Apr 21, 2009

    I have the same problem and if you find out what it is or was let me know.
    tspeed109@yahoo.com

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THE QUAD DRIVER IS BUILT IN THE COMPUTER.I WOULD REPLACE THE COMPUTER THEY ARE NOT EXPENSIVE ON YOU VEHICLE.LOCATED RIGHT FRONT INSIDE KICKPANNEL!

Posted on Feb 26, 2009

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Quad driver module code 26 and 28


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I have a 1991 Olds with a 3.3 liter engine and 51,000 miles. It started running rough from time to time, so I took it into the local mechanic and they replaced the injectors and the fuel filter, but that...


JOHN I UNDERSTAND YOUR FRUSTRATION. IM GONNA GIVE YOU MY INFO BASED ON EXPERIENCE BUT AT THE SAME TIME I DONT HAVE THE VEHICLE IN FRONT OF ME.THE 2ND GEAR CODE WHICH IS OBVIOUSLY A TRANS CODE PROB WHICH SOMETIMES CAN CAUSE THE EFFECT OF A DRIVABILITY (RUNNING) ISSUE. BUT THE QUAD DRIVER ISSUE IS WHAT PEAKS MY INTEREST. PRE OBD2 1996 AND EARLIER MODELS HAD PROM WHICH IS A REPLACEABLE PART ON THE ECM (ELECTRONIC CONTROL MODULE) ALSO CALLED PCM. GM HAD ISSUES WITH THIS WHICH IS THE REASON THEY WENT AWAY WITH IT. I HOPE THIS HELPS.

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I have a 91 Buick Century limited 3.3L with a 3300 engine. I ran a diagnostic scan of which produced the two-digit codes 12, 26, and 27, and In attempting to look up these codes, I found a website on...


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The Quad Driver is a "safety valve" for the ECM controlled circuits, the quad driver controls up to 4 circuits.

There are multiple quad drivers in the ECM. The QDM shuts down a shorted circuit to prevent high current flow from damaging the ECM. So the DTC 26 or 27 will isolate the problem to 1 QDM. You will need a repair manual with electrical diagrams and DTC flow charts to determine which of the circuits controlled by that QDM are failing.

Usually DTC 26 refers to the Torque Converter Clutch solenoid and related circuit. Most likely you have a shorted TCC solenoid or the harness connected to it, The solenoid is internal in the transmission accessible from the side cover.

Also, keep in mind the single most cause for any code will be a power or ground problem. Clean all the battery cables, and any and all cables or wires that attach from the engine to the firewall.

Hope this helps; also keep in mind that your feedback is important and I will appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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