1993 Pontiac Bonneville SSEI code 56 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-05-2011, 05:42 PM   #1
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Question 1993 Pontiac Bonneville SSEI code 56



Guys,
Can anyone tell me what code 56 means for 1993 Pontiac Bonneville SSEI? My Haynes book does not list this code.
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Old 06-05-2011, 05:43 PM   #2
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BTW, I can not find any post discussing this issue.
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Old 06-05-2011, 05:49 PM   #3
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56 quad-driver module #2 circuit
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Old 06-05-2011, 05:53 PM   #4
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Thanks Dan,
What is a "quad-driver module #2 circuit" lol...Can you provide advice on how to fix?
Thanks!
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Old 06-05-2011, 05:54 PM   #5
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Not really my area, but I seem to recall that'* the driver that is used by several sensors. But I don't recall which ones. I'll see what I can find.
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Old 06-05-2011, 05:56 PM   #6
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Found this.

The QDM is internal Pcm and contorls various components from check engine light to cooling fan to EGR soenoid and pugre solenoid. If it comes on as soon as you start the car most likely the EVAP purge solenoid is the fault.


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Old 06-05-2011, 05:59 PM   #7
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Looks like it'* part of the EGR, so check that, the EVAP system, so check those wires, torque converter clutch and brake switch, and radiator fan relay.
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Old 06-05-2011, 06:34 PM   #8
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Thanks Dan, as always it'* never simple (code, replace component, done). I will look into the items you suggested.
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