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2005 Chevrolet Silverado 3500 6.6L No Start, Poor Idle Quality, Cuts out, Stall, MIL Lamp on
Posted to GM Driveability on 6/21/2011 7 Replies

Replaced all these repair history items last year and prob went away for almost a year! Last time code p0642 would store after long runs when towing and very hot (great time for a failure) vehicle would store code and immediately stall. Sometimes would restart, sometimes not. Had to 4 different Chev. Dealers and that is when all the components were replaced. Found 1 of the batteries was totally shot and after replacing that I have had no problems until now. After truck had sat for a few days, went out to start and idled for about 10 sec and then stumbled and stalled and would not start, towed to shop pulled p0642. Vehicle now starts and runs fine. Prob is intermittent, cannot seem to make it occur again, but I am sure it will when I least want it to... Has anyone seen similar? Intermittents are the WORST to diag, because the data is not always there. This is my first HELP post... so please HELP, if there are any diesel techs out there who have seen similar issues your input is espicially welcome.... Thanks,

Related Repair History
Replaced ECM, Fuel Rail Pres. Sensor, EGR Valve, Oil Pres. sensor, Accelator Pos Sensor (APPS), and 2 new batteries. Wiring to injectors per TSB was also performed. no chaffed wiring, or shorted wiring has been found to date.

computer Codes & Descriptions
P0642- 5v reference signal 1 low
FIX posted 6/24/2011

Joe from Ohio

Files Referenced:

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car Vehicle Data

2005 Chevrolet Silverado 3500

VIN 1GCHK33285
Engine6.6 L / 8 cyl / DIESEL
Trans5-speed Automatic (Electronic)
DeliveryFuel Injection / DIESEL FI
EmissionsOBD-II Compliant
SymptomsNo Start, Poor Idle Quality, Cuts Out, Stall, MIL Lamp On
OccursCold, Hot, After a Hot Soak
Misc.Calibration P/N 15246462

Trouble Codes

P0642Sensor Reference Voltage 1 Circuit Low