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2004 Silverado - No crank, no start.

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Old October 17th, 2013, 5:03 PM
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Default 2004 Silverado - No crank, no start.

Hi folks, great forum!
I have a 2004 Chevy Silverado 1500 Z71 with 180,000 miles. It has a no crank, no start condition. I have replaced the ignition switch thinking that was the issue, but it still has the same problem.
I have had intermittent minor electrical issues for some time now. Sometimes the blower would stop working. Other times the radio would stay on after the key was removed and I opened the driver side door.
I have recently replaced the alternator, battery, knock sensors and spark plugs. Most of the new issues that recently popped up happened after I replaced the knock sensors under the intake. I had to pull up quite a bit of hardware to get to the sensors. I also did a lot cleaning and I probably got cleaner or water somewhere it shouldn't go like the PCM.
Anyway, since the knock sensor replacement, I started having a hard starting condition where the engine would start but wouldn't come up to idle unless I pumped the accelerator to about 2000 rpm. Then it would run great. Next day, same thing. It threw various ambiguous codes but nothing consistent. Then I narrowed it down to the alternator and had it tested. Sure enough, it was bad. But the battery had also been damaged. So I replaced them both.
It ran fine for weeks then one day, no crank, no start. After weeks of research, reviewing wiring diagrams and testing it seemed that the igniton switch was acting intermittently, so I replaced it. Two weeks go by without any problems then bloop! One morning, no start, no crank.
I've been able to isolate the problem to the crank relay circuit. I can jump out the crank relay and the engine cranks and even starts when the key is in the run position.
I do not have power to the small yellow wire at the top of the key cylinder housing circuit while the key is in start or run, whereas I did before. I also do not have power at the crank fuse either.
I have checked many fuse and changed a few around with no success.

Oh, another weird thing that is happening is the blower doesn't come on when the key is in the run or accessory position.

Two components I still need to look at are the Neutral Safety switch and the PCM.

Does anyone know a way to bypass the NSS or isolate the circuit in order to take the switch out of the circuit and therefore isolate the component?

Are there easier ways to check the PCM wiring without tearing everything apart?

I am stuck at this point and could use some real good advice, thanks!
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Old April 23rd, 2014, 5:42 PM
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Default

UPDATE: Still having the same problem. I have checked all fuses, relays, grounds, etc.. I have also checked the PNP switch. I have 12v volts power to terminal 11. You're supposed to be able to jumper across terminals 1 and 11 then try and start the truck. But it did not start for me.

So I'm back to square one. The only way I can get it running is to pull the starter relay in the underhood fuse block and jump across terminals 30 to 87. Works everytime. But then it starts throwing powertrain codes and won't shift out of 2nd. It's a low drive mode meant for when there are transmission issues.

But, the main problem that has to be resolved first is the "no crank" condition.

Any advice would be appreciated.
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Old July 11th, 2018, 3:59 PM
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Default What did you find?

Hello I'm having the same issue did you ever find out what was causing this?
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