Truck will turnover but wont start

Tiny
DIESELMAN95
  • MEMBER
  • 2003 GMC SIERRA
  • 6.6L
  • TURBO
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
I have a 2003 GMC sierra 2500HD 6.6 Turbo Diesel and I am a U.S. Marine on deployment and my wife says that one day the truck would not crank so she got the batteries recharged and the truck obviously has 2 batteries and she said she put the batteries on opposite sides of the truck by accident i.E. Battery A where battery B should be and vice versa I dont think this should matter but she ended up swapping the batteries to correct position and still not starting she then got her friend to put it on a computer which gave a problem code for the crankshaft positioning sensor so she replaced that and still nothing. My wife is very knowledgable about cars so she knows what shes doing she says it's turning over but wont start. What else might be the problem?
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Monday, June 1st, 2015 AT 12:52 PM

1 Reply

Tiny
HMAC300
  • EXPERT
Try resetting anti theft unit see pic
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Monday, June 1st, 2015 AT 3:18 PM

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