No Crank for 2004 4.2L - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 03-16-2017, 11:58 AM
SouthPhillyTB SouthPhillyTB is offline
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2006 Chevy TrailBlazer LS
Black Granite Metallic 4.2L I6 4X4
Join Date: Aug 2014
Location: Philadelphia, PA
Posts: 7
No Crank for 2004 4.2L

Long time reader, first time poster. My vehicle will not crank. My wife and I are arguing and she is demanding it towed to the dealer. Here is what I know. 2 weeks ago i was driving it and the power windows and power locks stopped working, the dash/gauges also looked funny, but I can't quite remember how. I shut off and it wounldn't crank. A couple hours later I tried restarting it and it did. I took it home and replaced the ignition switch and had no problems for about a week.

Then, I was driving it and the passlock light came on (stayed on) and the dash looked funny, but I again can't recall the exact details. I drove home and couldn't start it (no crank) after turning it off. The next day the same issue with no crank. I again replaced the ignition switch and it started (once). I turned it off to try it again and it did not crank. Based on this I'm guessing the problem was not with the ignition switch all along, but I could have bought two (2) crappy parts. I do have a remote car starter that was installed 2.5 years ago with no problems since installed.

Things I've tried. I pulled starter relay 47 it operates as expected and even switched it with the adjacent identical relay. I'm getting power to and from fuse 34. Fuse 22 is hot at run and start. Fuse 17 is hot at start. The Park/Neutral Position Switch sends a signal from Fuse 22 to the relay 47 terminal in Hot and Start. Based on this I'm guessing it is the PCM. It might be the remote starter or I'm going through ignition switches like water. I would appreciate any suggestions. Thanks in advance.
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  #2  
Old 03-16-2017, 12:38 PM
lightthemup lightthemup is offline
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2003 GMC TrailBlazer LS
Dark Gray Metallic 4.2L I6 4X4
Join Date: Jan 2017
Location: North Jersey
Posts: 23
Does it start with the remote starter all the time?

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  #3  
Old 03-16-2017, 05:53 PM
SouthPhillyTB SouthPhillyTB is offline
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2006 Chevy TrailBlazer LS
Black Granite Metallic 4.2L I6 4X4
Join Date: Aug 2014
Location: Philadelphia, PA
Posts: 7
The remote starter won't start it either.

I have a new thing I'm going to try when I get a minute (tomorrow morning) I'm going to jumper over the switch in relay 47 to force the starter to start while I turn the key to start. I've jumped this before when trying things and the starter worked hard to start the engine, but I did not have the key rotated to start.
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  #4  
Old 03-17-2017, 11:25 AM
lightthemup lightthemup is offline
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2003 GMC TrailBlazer LS
Dark Gray Metallic 4.2L I6 4X4
Join Date: Jan 2017
Location: North Jersey
Posts: 23
The remote starter bypasses the ignition switch so i don't think that is the problem.
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  #5  
Old 03-18-2017, 01:39 PM
SouthPhillyTB SouthPhillyTB is offline
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2006 Chevy TrailBlazer LS
Black Granite Metallic 4.2L I6 4X4
Join Date: Aug 2014
Location: Philadelphia, PA
Posts: 7
Thank you for your interest Lightthemup! So, I've tried several times jumping over Starter Relay #47 terminals and at the same time turning the key Start. The starter works hard to roll the engine and the engine almost sounds like it is going to start. But, it just won't. If your statement about the remote starter is correct, which makes since to me, then it almost has to be the PCM. Thoughts?
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  #6  
Old 03-18-2017, 01:42 PM
lightthemup lightthemup is offline
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2003 GMC TrailBlazer LS
Dark Gray Metallic 4.2L I6 4X4
Join Date: Jan 2017
Location: North Jersey
Posts: 23
Or the BCM, I think the BCM controls the factory security system

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  #7  
Old 03-19-2017, 03:55 PM
SouthPhillyTB SouthPhillyTB is offline
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2006 Chevy TrailBlazer LS
Black Granite Metallic 4.2L I6 4X4
Join Date: Aug 2014
Location: Philadelphia, PA
Posts: 7
So, I deconstructed the remote starter and all the connections and splices are solid. Any other thoughts?
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  #8  
Old 03-19-2017, 04:04 PM
lightthemup lightthemup is offline
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2003 GMC TrailBlazer LS
Dark Gray Metallic 4.2L I6 4X4
Join Date: Jan 2017
Location: North Jersey
Posts: 23
Like I said the Body Control Module could be acting up, but only the dealer can diagnose that, otherwise you are going to be replacing parts that are not at fault.

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  #9  
Old 03-20-2017, 09:41 PM
SouthPhillyTB SouthPhillyTB is offline
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2006 Chevy TrailBlazer LS
Black Granite Metallic 4.2L I6 4X4
Join Date: Aug 2014
Location: Philadelphia, PA
Posts: 7
The vehicle has been towed away. I'll finish the post when I know more.
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  #10  
Old 03-26-2017, 03:20 PM
SouthPhillyTB SouthPhillyTB is offline
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2006 Chevy TrailBlazer LS
Black Granite Metallic 4.2L I6 4X4
Join Date: Aug 2014
Location: Philadelphia, PA
Posts: 7
So, I found a friend of a friend who had a shop and they solved the problem. I didn't get a chance to talk to the mechanic as I picked up the vehicle after hours. They said there were two (2) wires in the rear tail gate that were grounding out. The wires were damaged in the rubber boot that is supposed to protect them as the tailgate opens and closes. They were related to the rear wiper and a light. The wires were replaced and it starts right up. I'm certain I would not have found this issue without some very detailed wire schematic. I'm glad I didn't just start replacing expensive parts, too.
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