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98 cadillac deville code p1646

Customer Question
98 cadillac deville code p1646
Submitted: 8 years ago.Category: GM
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Answered in 6 minutes by:
6/9/2010
GM Mechanic: JHoop, GMC Technician replied 8 years ago
JHoop
JHoop, GMC Technician
Category: GM
Satisfied Customers: 5,446
Experience: 14 Year Engine Builder,16 years as a Tech HvyLine, Suspension, Electrical, Brakes, 6 Year Shop Owner
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Hello , my name isXXXXX you for choosing justanswer.com.

Do you have a scanner that can access the failure recorder in the PCM to determine what circuit is shorting or opening?
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Customer reply replied 8 years ago

we had this vehicle to the local cadillac dealer and they could not locate that code

 

GM Mechanic: JHoop, GMC Technician replied 8 years ago
They have the scanner you need to do this repair. If you have paid them once for this, I would take it back and give them the GM chart to deal with this problem

You may have a faulty Evap Vent Valve that is intermittently failing.

I uploaded the procedure in .pdf format here to justanswer. You can download it by clicking HERE. I hope this helps you.

If you have any more questions or need any more diagrams, please don't hesisitate to ask...Thanks again, JHoop

If you need more help, please ask. If this answer helped you, please click ACCEPT. If you have a deposit but do not click ACCEPT you will STILL be charged, but I don't get credit! Not clicking ACCEPT hurts the Techs that help you!

Edited by JHoop on 6/9/2010 at 6:44 PM EST
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