Question about 1994 Chevrolet Corsica

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DTC fault code 27

I keep gettinga DTC Fault Code 27, when this code kicks and the check engine light comes on the fan also comes on. i have a new egine and Trans. all of the sensors have been rep aced except for the Crank shaft senor and the Knock sensor. i can not find what is causing this code. i have also replaced the TCC when the trans was rebuilt. can anybody help.

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  • mgonz4 Mar 12, 2009

    I have already checked for loose or unplugged connectors. but have not found any. between 94 and 95 chevy used a OBD 1.5 hybrid system. but i will look again you never know what you might find.

    Thanks for the quick response.

  • yadayada
    yadayada May 11, 2010

    recheck that code, GM has no code 27, are u sure it isn't code 21?

    DTC - 21 Throttle Position sensor error (signal high), replace sensor

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This is a quad driver fault. something that the computer is trying to switch on or off has been left unplugged after all your work. I would look for a solenoid , valve, or transmission connector that is not hooked up or loose.

Posted on Mar 12, 2009

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It's a 1995 Saturn sl the clutch on ac compressor kicks on with direct power the engine fan also changed relays still get the code 26 quad drive modal need some help


This info is from 1998 Saturn Sl , my service info doesn't go to 95 . It's the same except for code numbers , My info is P0xxx #'s . The quad driver is part of the ECM - engine computer !
Here is a description from Saturn service info .
A quad driver module (QDM) is an electronic switch which completes a ground circuit when switching ON. The QDM independently controls 4 separate outputs. A load is connected between battery voltage and the QDM allowing the QDM driver to control the output. Each QDM has fault detection logic which compares QDM driver input and output voltages. The logic expects to measure less than 3 volts when the QDM driver is ON and greater than 7 volts when OFF. The QDM has only one fault line that will detect a fault on any of the 4 outputs. The scan tool can be used to cycle the outputs ON or OFF. The scan tool can also perform an automated test which can isolate the faulty circuit.
The quad drive it self may be bad , GM had a problem with these !
Did you check fuse's ?
Conditions for Setting the DTC
DTC P01650 and/or P1651 will set if:
?€¢
There is an open, short to ground or short to voltage on any of the QDM output circuits


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MIL (SERVICE ENGINE SOON) telltale circuit


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Upshift lamp circuit


?€¢
Cooling fan relay circuit


?€¢
A/C relay circuit


?€¢
Fault detected for 5 seconds for DTC P1651. Fault detected for 20 seconds for DTC P1650.

Important: The QDM circuit is continuously checked when the engine is running.

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All fault codes can be checked out at http://www.bluejag.co.uk but here are the results for some of yours. You can ignor P1111. Looks like a faulty plug or coil pack cylinder 2

Fault Code:- P1314 Indicates a Power-train fault


The fault is generally due to a problem in the Ignition or Misfire area


Fault Description: Misfire rate catalyst damage -bank 2 NOTE: This DTC will flag only when accompanied by an individual cylinder misfire DTC: P0300 - P0306

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Fault Code:- P1316 Indicates a Power-train fault


The fault is generally due to a problem in the Ignition or Misfire area


Fault Description: Misfire excess emission NOTE: This DTC will flag only when accompanied by an individual cylinder misfire DTC: P0300 - P0306

Action of ECM:- none


After clearing the DTC, complete the Misfire monitor drive cycle
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Fault Code:-
P0302 Indicates a Power-train fault


The fault is generally due to a problem in the Ignition or Misfire area


Fault Description: Misfire detected ?€" cylinder 2

Action of ECM:- none


After clearing the DTC, complete the Misfire monitor drive cycle
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Code po560


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The fault is generally due to a problem in the Vehicle Speed & Idle Control area


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