Pcm issues? Or connector? Need help - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



Welcome Enthusiast! If you already own a Chevy TrailBlazer or GMC Envoy or perhaps thinking of purchasing such a vehicle, then you have come to the best TrailBlazer and Envoy site on the net! Rainier, Bravada, Ascender, and 9-7x owners welcome too!

You are currently viewing our site as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to search and post topics, communicate privately with other members, respond to polls, upload content, and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.
Join Today!
Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2013 Chevrolet Trailblazer > 2013+ Chevrolet Trailblazer Forum

2013+ Chevrolet Trailblazer Forum Discussion on the new upcoming 2013 Chevy Trailblazer

TrailVoy.com is the premier GMC Envoy Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools
  #1  
Old 12-12-2018, 04:39 AM
Salko88 Salko88 is offline
Junior Member
 
Join Date: Dec 2018
Posts: 6
Pcm issues? Or connector? Need help

I removed all the connectors to pcm and ecm and the battery to repair the common power steering leak on d side front basically did it so i have more room. Connected everything back together now im getting few codes
P0036 - h02s heater control circuit bank 1 sensor 2
P0787 - shift/timing solenoid low
P1815 - transmission range switch start in wrong range.
P0976 - shift solenoid b control circuit low
P2769 - torque converter clutch circuit low
P2432 - secondary air injection system air flow/pressure sensor circuit low bank 1
P0141 - 02 sensor heater circuit bank 1 sensor 2
P0443 - evaporative emission system purge control valve circuit

I had no codes on dash or any issues till i did this repair. Check engine on traction with triangle on and traction with wrench is on all wiring looks ok and tested grounds are all good. Possible a bad pcm? Also tried to reset pcm with fuse 10 and 28 and comes back on soon as you start the vehicle. Anyone have any ideas what it could be?
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 12-12-2018, 09:56 AM
TB-Al's Avatar
TB-Al TB-Al is offline
Member
 
2007 Chevy TrailBlazer LS
Graystone Metallic 4.2L I6 2WD
Join Date: Nov 2017
Location: Pleasure Island, Al.
Posts: 301
If there were no blown fuses it sure sounds like a connector issue to me.

For future reference I assume you disconnected the battery first and reconnected last. Otherwise, yes, inserting voltage spikes into computers at the connectors can cause them to fail.
__________________
"It is useless to do with more what can be done with less." William of Occam
Reply With Quote Quick reply to this message
  #3  
Old 12-12-2018, 12:40 PM
Salko88 Salko88 is offline
Junior Member
 
Join Date: Dec 2018
Posts: 6
That would be same as replacing the battery, yeah i connected the battery last, isnt it supposed to burn the fuse first? My pcm fuses are fine and does anyone have the pcm and harness scematic?
Reply With Quote Quick reply to this message
 
  #4  
Old 12-13-2018, 09:40 AM
TB-Al's Avatar
TB-Al TB-Al is offline
Member
 
2007 Chevy TrailBlazer LS
Graystone Metallic 4.2L I6 2WD
Join Date: Nov 2017
Location: Pleasure Island, Al.
Posts: 301
Autozone has complete wiring diagrams free on their website. Repair help / Repair guides / wiring diagrams.

Fuses are to keep things from catching fire. It is very difficult to protect semiconductors with just fuses. It is almost always the voltage that destroys them and not the current.
__________________
"It is useless to do with more what can be done with less." William of Occam
Reply With Quote Quick reply to this message
  #5  
Old 12-13-2018, 02:06 PM
Salko88 Salko88 is offline
Junior Member
 
Join Date: Dec 2018
Posts: 6
Ok im going to have a friend check all the connectors this weekend im not good with wiring he says if i can get those scematics he can check everything with a voltmeter. If everything checks out good. Do you recomment pcmforless or ebay?
Reply With Quote Quick reply to this message
  #6  
Old 12-14-2018, 04:49 AM
princej99 princej99 is offline
Member
 
2008 GMC Envoy SLE
Bordeaux Red Metallic 4.2L I6 4X4
Join Date: Jan 2018
Location: ont
Posts: 477
Quote:
Originally Posted by Salko88 View Post
Ok im going to have a friend check all the connectors this weekend im not good with wiring he says if i can get those scematics he can check everything with a voltmeter. If everything checks out good. Do you recomment pcmforless or ebay?
if its the pcm, and we hope its not.

both eBay and pcmforless would work. pcmforless might be better as with them you know what you will be getting.
no surprises.

post back with the results of the wiring test.
Reply With Quote Quick reply to this message
  #7  
Old 12-19-2018, 05:19 PM
John in RI's Avatar
John in RI John in RI is offline
Member
 
2005 BowTie TrailBlazer LT
Olympic White '50U' 4.2L I6 4X4
Join Date: Aug 2018
Location: Greene, RI
Posts: 104
I don't know if that stuff all shares a common ground or not, but it seems like to many various sensors/circuits to be "+" voltage related to me. I'm guessing a ground problem. Re-check the harnesses to see if you forgot to re-install a previously removed ground wire somewhere; re-check the negative battery cable connections too.

Might be a poorly fitted PCM connector too.

Reply With Quote Quick reply to this message
  #8  
Old 12-25-2018, 02:11 AM
Salko88 Salko88 is offline
Junior Member
 
Join Date: Dec 2018
Posts: 6
Ok. Finally got a 3 year subscribtion for 30 bucks for alldatadiy.Friend never came by to help that was supposed to look at my wiring since im not good at wiring. So i got tired of it and started researching on alldata all my codes that are on are coming from pcm3 . Took apart the loom and sure enough about 8 inches back all my wires are corroded and as i was moving them they fell apart in the loom. So i rewired everything and cleared all codes. Everything is back to perfect.
Reply With Quote Quick reply to this message
  #9  
Old 12-25-2018, 05:58 AM
Akrich Akrich is offline
Junior Member
 
2005 Chevy TrailBlazer LT EXT
Dark Gray Metallic 4.2L I6 4X4
Join Date: Jun 2018
Location: Durango, Co.
Posts: 83
Congratulations! Wiring issues can be such a pain. Thank you for posting your resolution. So many times the OP just disappears and we never know what happened.
Can you edit the thread title to show "SOLVED".
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum forums, you must first register.

Please enter your desired user name, your email address and other required details in the form below.
(Only letters, numbers, dashes and underscores are permitted for user names)
The user name that you choose is permanent and can never be changed.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Location
Where you live (ex: Philadephia, PA)
Vehicle Year
Choose your year
Or enter your choice here:
Vehicle Color
Choose your factory color (Custom, Not Listed & Two-Tones; Use Text Field Below)
Or enter your choice here:
Vehicle Make
Choose your make
Or enter your choice here:
Vehicle Model
Choose your model
Or enter your choice here:
Vehicle Engine
Choose your engine
Vehicle Drivetrain
Choose your vehicle drivetrain
Security Question
Fill in the blanks: Tra___oy
Insurance
Please select your insurance company (Optional)

Log-in



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


» Sponsors

Advertising Info

All times are GMT -4. The time now is 08:17 AM.


Chevy TrailBlazer and GMC Envoy Enthusiasts - Copyright 2004 - 2009 All Rights Reserved.
All trademarks referenced herein are property of their respective owners.
RSS Feed