No battery power, no start. 2010 Yukon XL 5.3L

[RogerK]

No start, no dash lights. Un-hooked neg battery post and re-attached.
All power and dash lights came back, started right up.
Anyone else ran into this problem?

 

[Doubeleive]

No start, no dash lights. Un-hooked neg battery post and re-attached.
All power and dash lights came back, started right up.
Anyone else ran into this problem?

if simply disconnecting the battery fixed the problem and there have been no other issue's then I would start by replacing the battery cables and cross your fingers that's all it is.
you may also want to check and clean all the main grounds you can find even if they look ok, remove and wire brush both sides and reconnect.
***that's a basic fix, these vehicles are really picky about voltage

 

[Dustin Jackson]

Yup negative battery cable breaks internally and moving it around get can get it connected enough to start the motor, next time this happens just wiggle the negative battery cable around without unbolting it and see if it starts