2003 Cadillac Escalade P0651

Tiny
BIGDNAL
  • MEMBER
  • 2003 CADILLAC ESCALADE
  • V8
  • 2WD
  • AUTOMATIC
  • 18,000 MILES
My wives 03 Escalade has started giving us a little trouble with it's smoothness ! Running really rough at idle and in gear. My scanner coded a P0651? I have figured out what the code is but not what to do about it without the s.O.S. So to speak! Replace this and that until it's right! That can get pretty expensive on a late model Cadi!
Saturday, November 28th, 2009 AT 11:41 PM

2 Replies

Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
The fault relates only to the 5V reference for the fuel tank pressure sensor(used for evap diagnostics), and the a/c pressure sensor. This should give no rough run, or be set by one. If you have a scan tool, does it read misfires, and is it counting any?
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Tuesday, December 1st, 2009 AT 10:54 PM
Tiny
BIGDNAL
  • MEMBER
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BigDnal.
A friend and I later that night removed the computer beside the battery to find that the problem was in the connections there! After we removed the plugs to the ECM(?) We found a green carrotion around over half the prongs. We cleaned carefully and used electic contact lube and reinstalled. Then it was time for a TEST DRIVE! Black marks at the end of my road will conferm that that was indeed the problem! Thanks for your feedback though! This is a great site y'all have
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Thursday, December 3rd, 2009 AT 5:48 AM

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