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Quad driver module, codes 640 &670 - 1995 Buick LeSabre

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Posted on Jan 02, 2017

66 chrgr
  • 1011 Answers

SOURCE: i have a 1991 olds cutlass cierra. code 26 quad

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

SOURCE: i am getting a code po676 quad driver module

The quad drive is in the PCM (Power Control Module) NOT the Electronic Control Module (ECM)

Posted on Mar 21, 2010

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Quad driver module code 26 and 28


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I have a 1995 buick la sabra i got an error code po676 quad driver module failure i replaced the E C M and i am still getting the same code


The quad driver in the ecm operates the higher amp draw for certain relays and solenoids one of them is faulty or there is a short to ground in the wiring.You will have to locate a wiring diag. and figure out which quad driver is the bad one and see what it controls.There should be at least 2 quad drivers maybe more and they would be numbered in the diag.

Mar 21, 2010 | 1995 Buick LeSabre

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HAVE CODE 26--CHECK RESISTANCE ON INJECTORS, EGR SOLINOID & PURGE SOLINLID--REPLACE PCM. STILL HAVE SAME PROBLEM. CAN YOU HELP? LARRY


There's a lot of information regarding your problem here:

http://www.saturnfans.com/forums/showthread.php?t=284

My suggestion would be to contact a local dealer and have them run the diagnostic (usually under $100), then if the part is easily replaceable, do it yourself. If it's more involved, then bargain with the dealer on a good price to have the problem fixed.

I truly hope that the Quad Driver itself isn't what's causing the code.

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Does not accelerate


These are quad driver codes.... The drivers are part of the computer and it is rare for the computer to blame itself... Have the system checked again for stored codes and diagnose the system indicated properly by who ever you feel most comfortable with.

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