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P1639 Diagnostic Trouble Code Discussion for April 2012

5-Volt Reference 'B' Circuit Malfunction

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Trouble Ticket Help Requests for DTC P1639
Help Request Posted
2002 Cadillac Escalade 6.0L MIL Lamp on VIN: 1GYEK63N92
P1639: 5-Volt Reference 2 Circuit Malfunction. this truck got a p 1639 code always i have my 5 volts at tps but i cant see the tps volts on my scanner i have unplugged the egr the mass but still the same my tank fuel press is betwen 0.50 and 2.25 v and i could not unplug it whitout removing the fuel tank ....
April 04, 2012