Question about 1992 Buick LeSabre

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History Code #26 Quad Driver Failure

No codes now gas milage down 136000 miles runs good!!

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Replace power train control module

Posted on Jan 13, 2009

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Quad driver module code 26 and 28


A quad driver is a transistor in the engine control module ! GM OBD Trouble Code 26 GM OBD Trouble Code 28

Jul 24, 2016 | Cars & Trucks

1 Answer

Quad driver code 26.


Which year it is?

Jun 10, 2016 | Cars & Trucks

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93 buick regal 3.8 codes 26QMD &42EST PLUS POOR GAS MILAGE


Code 26 is for a problem with one of the quad drivers inside the engine computer, or the wiring harness, and code 42 is for a problem with the ignition module or the control.
You'll need a shop manual with the testing procedures for each code to proceed.

Feb 24, 2015 | 1993 Buick Regal

1 Answer

Have 95 saturn sl with code 26 and 27 quad driver


well the quad driver may not be at fualt and most likely is not.

there is a fualt line that the computer uses to monitor for fualts but the thing is one line monitors four different things and the code is to get you in the general area but not to the exact fualt. so from here you need to test for failed components. that code and the quad driver monitors the a/c , evap solniod , egr solenoid and coolant fan relay. the fan relay and egr are the most common i see all the time. and with you having an isssue with that coolant light i want to say check the fan circuit.

let me know if you have more question thank you and good luck

Nov 26, 2009 | 1995 Saturn Sl

1 Answer

Code 26 what does it mean


DTC 26 refers to a quad driver module fault. 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 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.

I will assume this is a 3800 V6 w/ 4T440 / 440 T4 transmission with the digital (3 solenoid valves) EGR valve.
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. Many problems can be resolved by just doing this. Many times a computer will give false codes when it doesn't get the correct amount of voltage, or a good ground is not established between the battery, engine, and the body of the vehicle.
Glad to help out, Good Luck!!!

Oct 28, 2009 | 1989 Pontiac Bonneville

1 Answer

91 saturn sl1 code 26 stalls at an idle when in d or r


its possiable the computer has a bad quad driver, before throwing parts at it, take it to a shop and have it verified

Apr 29, 2009 | Saturn SL1 Cars & Trucks

1 Answer

1989 lesabre engine codes


26 is a quad driver failure, 41 is a cam sensor failure. I can give you a test procedure for 26 but for 41 you likely need to replace the magnet that is in the cam gear for the cam sensor pick-up.

Mar 24, 2009 | 1989 Buick LeSabre

1 Answer

1991 honda accord lx getting bad gas milage


I have known when the distributor starts to go bad it will not fire 100%, that could cause your failure in good gas mileage!

Jan 20, 2009 | 1991 Honda Accord

1 Answer

93 Buick Regal not running good. Scanned it, the code it gave me was 26 quad driver module. I am not sure what i can do, does anyone have a solution?


The quad driver is in the computer it drives the fuel injecters. you could have an injector problem if one injector shorts it will cause the code to show up you can ohm the injectors and find the problem e-mail me and let me know what you find Phil

Dec 25, 2008 | 1993 Buick Regal

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