[SOLVED] PCM code P0601 randomly shuts engine off! Covered under 80k emissions warentee? - 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 > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 General Tech Q&A > General

General If it doesn't fit in any other forum

TrailVoy.com is the premier GMC Envoy Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools
  #1  
Old 01-04-2011, 05:15 AM
gearheadvr4 gearheadvr4 is offline
Junior Member
 
2006 Chevy TrailBlazer SS (1SS)
Black 6.0L LS2 V8 2WD
Join Date: Nov 2009
Location: Corpus Christi
Posts: 43
PCM code P0601 randomly shuts engine off! Covered under 80k emissions warentee?

My PCM for an 06 SS throwing an error code of P0601 and a "tighten fuel cap" message. The fuel cap throws a code that refers to a vacuum line or something similar. I do not remember the exact numbers.


These may be unrelated but the big one that has me worried is the p0601 PCM error. This is a memory error in the computer and it randomly shuts the car off!!! Sometimes pulling out if the driveway, and other times on a busy freeway. This is very dangerous and we need to get it fixed asap. Would it be covered under the 80k federal emissions warentee?
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 01-04-2011, 08:05 AM
Topher's Avatar
Topher Topher is offline
Member
 
2002 GMC Envoy SLT
Light Pewter Metallic 4.2L I6 4X4
Join Date: Oct 2009
Location: Northeast Ohio
Posts: 132
P0601 is a Transmission Control Module (TCM) Read Only Memory (ROM) failure. It is not an emissions device and as such would not be covered under an emissions warranty.

Also, the actions taken when it sets do not include shutting down the vehicle...something else is causing that. Unless the command of 2nd gear makes you think the engine is shutting down because you were in a higher gear?

From the repair manual:

DTC Descriptors
This diagnostic procedure supports the following DTCs:
  • DTC P0601 Transmission Control Module (TCM) Read Only Memory (ROM)
  • DTC P0602 Transmission Control Module (TCM) Not Programmed
  • DTC P0603 Transmission Control Module (TCM) Long Term Memory Reset
  • DTC P0604 Transmission Control Module (TCM) Random Access Memory (RAM)
  • DTC P062F Transmission Control Module (TCM) Long Term Memory Performance
  • DTC P1621 Transmission Control Module (TCM) Long Term Memory Performance

Conditions for Running the DTC
The TCM runs the program to detect an internal fault when the engine is running. The only requirements are voltage and ground. This program runs even if the voltage is out of the valid operating range.

Conditions for Setting the DTC
The TCM has detected an internal malfunction.

Action Taken When the DTC Sets
  • The TCM requests the ECM to illuminate the malfunction indicator lamp (MIL).
  • The TCM commands second gear.
  • The TCM commands maximum line pressure.
  • The TCM inhibits torque converter clutch (TCC).
  • The TCM freezes transmission adaptive functions.
  • The ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as Freeze Frame and Failure Records.
  • The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as Failure Records.
  • The TCM stores DTC P0601, P0602, P0603, P0604 or P062F, P1621 in TCM history.
__________________
200k miles and counting
Fullly stocked with Amsoil; Quad headlight mod; Jetttstream quad LED brakelights.
Reply With Quote Quick reply to this message
  #3  
Old 01-05-2011, 04:22 PM
gearheadvr4 gearheadvr4 is offline
Junior Member
 
2006 Chevy TrailBlazer SS (1SS)
Black 6.0L LS2 V8 2WD
Join Date: Nov 2009
Location: Corpus Christi
Posts: 43
Hmm, that doesn't seem right.

It really does shut the engine off. Completely off. All the electronics work.

When this happens I cannot start the car. The starter is dead and the engine will not crank or start for about a min or 2.

This is what I got with a search. I could be wrong? I really hope it is not a transmission problem!

P0601 OBD-II Trouble Code
Technical Description

Internal Control Module Memory Check Sum Error
What does that mean?

Basically that means that there is an interal fault in the Powertrain Control Module (PCM). There have been many reported PCM failures on Chrysler/Dodge products although it is possible for this to happen on any vehicle. In Dodge/Chrysler products, a P0601 trouble code means that a serial communication failed inside the computer at least 6 times.
Symptoms

Likely, no symptoms will be discernible to the driver, other than the illuminated Check Engine Light. Typically the engine runs fine, gauges work, etc.
Causes

A code P0601 in most cases means the PCM has gone bad. This is possibly due to a short-circuit inside the PCM. Or, if you disconnect the wires/connector from the PCM while the battery is still connected, that may also cause this code.
Possible Solutions

With a P0601 OBD-II trouble code, the most common fix is to replace and reprogram the PCM. In a few cases the dealer may be able to reflash the PCM and get it working. But more than likely the PCM will need to be replaced and reprogrammed (we recommend you take it to a dealership for this). The good news is it *may* be covered under your emmissions warranty. So even if you're out of bumper-to-bumper warranty or powertrain warranty, check your warranty guide or dealer to see if this is covered.
Reply With Quote Quick reply to this message
  #4  
Old 01-07-2011, 08:38 AM
gearheadvr4 gearheadvr4 is offline
Junior Member
 
2006 Chevy TrailBlazer SS (1SS)
Black 6.0L LS2 V8 2WD
Join Date: Nov 2009
Location: Corpus Christi
Posts: 43
The dealership replaced the PCM for free under the 80k emissions!

Now I just need to send it in to PCM4less for the tune and efan programming. I'm pretty happy. No more random engine shutdowns.
Reply With Quote Quick reply to this message
  #5  
Old 03-08-2012, 03:38 PM
gtiplus gtiplus is offline
Junior Member
 
2006 Chevy TrailBlazer LS EXT
Graystone Metallic 4.2L I6 2WD
Join Date: Feb 2010
Location: Groveland, FL
Posts: 23
My vehicle is over 110,000 miles and doing the same thing. How hard of a job is it? I haven't looked in the Haynes manual yet so I'm not quite sure where the PCM is even located. Also is it and expensive part? when my truck shut off I got several codes, some which I believe to be because of the truck shutting down while doing 65mph. I got P0135, P0116, P0601, and P0461.
Reply With Quote Quick reply to this message
  #6  
Old 03-08-2012, 03:41 PM
gtiplus gtiplus is offline
Junior Member
 
2006 Chevy TrailBlazer LS EXT
Graystone Metallic 4.2L I6 2WD
Join Date: Feb 2010
Location: Groveland, FL
Posts: 23
Quote:
Originally Posted by gearheadvr4 View Post
With a P0601 OBD-II trouble code, the most common fix is to replace and reprogram the PCM. In a few cases the dealer may be able to reflash the PCM and get it working. But more than likely the PCM will need to be replaced and reprogrammed (we recommend you take it to a dealership for this). The good news is it *may* be covered under your emmissions warranty. So even if you're out of bumper-to-bumper warranty or powertrain warranty, check your warranty guide or dealer to see if this is covered.
My vehicle is over 110,000 miles and doing the same thing. How hard of a job is it? I haven't looked in the Haynes manual yet so I'm not quite sure where the PCM is even located. Also is it and expensive part? when my truck shut off I got several codes, some which I believe to be because of the truck shutting down while doing 65mph. I got P0135, P0116, P0601, and P0461.
Reply With Quote Quick reply to this message
  #7  
Old 03-08-2012, 03:47 PM
Ray Dockrey's Avatar
Ray Dockrey Ray Dockrey is offline
TrailVoy Alumni
 
2009 Chrysler PT Cruiser
Inferno Red Other 2WD
Join Date: Aug 2008
Location: Mustang, OK
Posts: 1,088
The ECM is under the hood on the right when looking at the engine from the front. Not hard to change but very expensive. You might contact PCM4less and see what they can do for you. May be cheaper to go through them. They are a very popular tuner on here.
Reply With Quote Quick reply to this message
  #8  
Old 03-09-2012, 02:18 AM
gtiplus gtiplus is offline
Junior Member
 
2006 Chevy TrailBlazer LS EXT
Graystone Metallic 4.2L I6 2WD
Join Date: Feb 2010
Location: Groveland, FL
Posts: 23
Quote:
Originally Posted by Ray Dockrey View Post
The ECM is under the hood on the right when looking at the engine from the front. Not hard to change but very expensive. You might contact PCM4less and see what they can do for you. May be cheaper to go through them. They are a very popular tuner on here.
Thanks Ray, I'll check into it.
Reply With Quote Quick reply to this message
  #9  
Old 04-30-2014, 06:37 PM
Jmurphy Jmurphy is offline
Junior Member
 
2006 Chevy TrailBlazer LS
Emerald Jewel Metallic 4.2L I6 4X4
Join Date: Apr 2014
Location: Buffalo
Posts: 1
Smile 2006 trailblazer needed new pcm

My trailblazer did the exact same thing. It would stall randomly...all electronics worked. Would wait. 2 minutes and car would start. Dangerous. Threw code p0601.....thanks to this forum i was able to fix.... Replaced myself with pcm bought on ebay...easy to install
Reply With Quote Quick reply to this message
  #10  
Old 06-22-2014, 07:19 PM
Jimbonm Jimbonm is offline
Junior Member
 
Join Date: Jun 2014
Posts: 1
I am having the same problem with my 2009 Trail Blazer the dealership says this code is the number one plug misfiring, what a crock. Same problems, engine quits and will not start until several minutes then it starts and runs fine, and yes, what if it stalls entering traffic.
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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




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 09:50 PM.


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