P1639 Diagnostic Trouble Code Discussion for April 2012
5-Volt Reference 'B' Circuit Malfunction
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| 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 |
