Will not crank

PAUL VAN BROECK

MEMBER
2003 CHEVROLET TRAILBLAZER
4.2L
4WD
AUTOMATIC
300,000 MILES

I was driving and it stalled out. When I tried to restart all gauges came on but fuel gauge read empty, but had three quarters of a tank of gas. Also, shift indicator had no line under p when I shifted the vehicle into neutral still no indication of shifter location and no crank on engine. Tried to tow it home. Disconnected negative to restore defaults. No joy. Plugged in odb2 maxi scan to see if codes but got link error. Pulled fuses and tested with circuit tester and it lit up on all but one. At the time there was no warning lights the odd back fire and was using more gas than usual. I did put in gas system cleaner the day before but acceleration was great.

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
42,833 POSTS

Hello,

It sounds like you lost the PCM but to be sure lets check the system fuses.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Here are the fuse locations.

If everything checks out would would try a used PCM plug it in see what happens.

Check out the diagrams (Below)

Please let us know what you find. We are interested to see what it is.

Cheers, Ken

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Thursday, March 29th, 2018 AT 3:15 PM

PAUL VAN BROECK

MEMBER
2 POSTS

Tx ken I think I did a dumb move I did process of elimination but did not check all the fuses and swapped out my 03 trail blazer with a newer envoy ( same model # on the pcm so now im trying to get the pass lock to turn off. Connected my maxi scan reader to it and I get a link error

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Friday, March 30th, 2018 AT 12:08 PM

KEN L

MASTER CERTIFIED MECHANIC
42,833 POSTS

The link error seems strange. here is a wiring diagrams and power fuse for the connector please check the wiring power and ground connections:

https://www.2carpros.com/articles/how-to-check-wiring

ALDL connector wiring diagram is below.

Check out the diagrams (below)

Please let us know what happens.

Cheers, Ken

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Saturday, March 31st, 2018 AT 11:29 AM

210WERA&CT

MEMBER
1 POST

I’m having same issue on my 2006 Trailblazer base model 4.2L 6 cylinder.
Only before my vehicle stalled out on me the check engine light was blinking. A friend of mine says a ground wire may have shorted the comp. I would like to see if anyone has any other suggestions before I try replacing comp. He also tried cranking by directly connecting starter to battery it cranked but never fully started engine.

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Tuesday, June 22nd, 2021 AT 11:39 PM

KEN L

MASTER CERTIFIED MECHANIC
42,833 POSTS

I would do a scan first to see what comes up. this guide can help us:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down this guide and report back.