Joe_The_Guy

I have an 03 silverado 1500 5.3 automatic 2wd that won't start. Engine stalled while i was driving it. when i tried to crank it, it tried to start a couple times, and then any time since then, it just cranks and nothing happens. At first, I found code p0336 and cleared it. Hasn't showed up since, even just before i replaced the crankshaft position sensor.

I've replaced the fuel pump, fuel filter, crankshaft position sensor, maf sensor, map sensor, spark plugs, spark plug wires, and ignition switch.

• injectors are getting over 12 volts when key is on, but no ground, even when cranking.
• Coil packs are getting over 12 volts when key is on and are grounded good on drivers side engine block (checked with continuity tester)
• spark plug wires get 0 volts when engine is cranking
• good fuel pressure
• Tried resetting security system by turning on key for 10 minutes 3 times even though there is no security light on or blinking or icon.
• Checked all fuses and only my backup light fuse was out. Replaced.
• Swapped around working headlight relays to the other important ones even though i believe they all work.
• When replacing the ignition switch, i saw an orange wire that was cut in half. It runs up the shift lever, but i assume it goes to my tow haul button. Just to be safe, i touched the two sides together and tried starting the truck. It made no difference

it may be worth noting i was making a turn when the engine shut off.

I just bought this car 5 days ago and its was running fine. It has 253,980 miles.

oilcanhenry

My bet is on a busted/ broken reluctor ring Particularly at those miles.

Joe_The_Guy

I didn't think of that. It was the camshaft position sensor. Fired right up after i replaced it.