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· Mr. Vehicle Destroyer
12,391 Posts
go under the hood and unplug the egr valve (its the brownish colored connector on the drivers side just under that plastic cover)

Unplugging it will tell the engine not to modulate it and if truely the P0403 is causing the no start, this should solve the problem until you can make it back to a dealer. If it doesn't solve the problem your truck is having other issues.
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