check engine light and transmission not shifting - Chevy and GMC Duramax Diesel Forum
01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

 
LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old 01-07-2011, 10:29 PM Thread Starter
Junior Member
 
Join Date: Dec 2009
Location: Wilmington NC
Posts: 59
check engine light and transmission not shifting

I was driving today and the check engine light came on and it wont shift past 2nd or 3rd gear (i can't remember which)
Is there a way I can check the check engine code without a scanner? On my jeep it's a series of key on and off which pop the codes up on the dash, is that possible with this truck? (01)
Would I be able to reset it by disconnecting the battery for a few min?

The shifting feels fine, but then it won't go to the next gear. Starting from a stop is normal, no hard shift to second, no delay going into drive or reverse. I'm really hoping its some computer issue, because I HAVE to drive 180 miles home sunday morning, any help would be greatly appreciated!!

2006 Chevy 2500 LBZ
2006 GMC savana van
dirtymike is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 01-08-2011, 07:47 AM
Administrator
 
jc1843's Avatar
 
Join Date: Jun 2008
Location: So. Cal
Posts: 14,534
Send a message via AIM to jc1843
There is no way to read the codes without a scanner. Some codes will clear if you disconnect the batteries for 15-20 minutes, but if the problem is still there, it will go "Limp" again.

Drive to an auto parts store and have them check the codes-- write them down before they are cleared. (Some places will only read codes-- not erase them, because of liability)

Might be time to purchase a code reader, then you would be able to read, and clear codes yourself.

Chevy 04.5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy pump, shimmed, Pre-fuel filter, tow mirrors, BU cam, gauges, GPS, Sirius, bags, custom grille, fender vents, HD trans cooler- Curt front hitch, footwell lights, load lights, Studs, head gaskets.--- Jerry
jc1843 is online now  
post #3 of 7 (permalink) Old 01-08-2011, 09:23 AM Thread Starter
Junior Member
 
Join Date: Dec 2009
Location: Wilmington NC
Posts: 59
well i bought a hypertech tuner that is supposed to be able to read and clear codes, but it can't read the vin and won't do anything.

2006 Chevy 2500 LBZ
2006 GMC savana van
dirtymike is offline  
post #4 of 7 (permalink) Old 01-08-2011, 09:29 AM
Senior Member
 
lugnut's Avatar
 
Join Date: Dec 2010
Location: Michigan
Posts: 289
You probably can't read any codes because the unit many not be communicating with the transmission control module (TCM). You will likely discover a P0700 in the ECM, but the TCM will contain the transmission code. My guess is the TCM has a problem upshifting into one of the higher gears so it is inhibiting the shifts. The TCM will only allow what is knows is right, and will inhibit shifting to prevent damage. It sounds like it is time to pay some diagnostic fees to a trans shop or dealer. I would recommend finding someone who has experience with Allison, otherwise they might do some guessing.

2006 2500HD LBZ 4X4 CC/SB LT3, 265/75R16, Rhino Liner, PCV Reroute, Resonator Plugged, 35w 6K HID Low Beam & Fog Lights, LED Interior Lights, ISSPro Pyro, Boost, & Rail Pressure Gauges in A-Pillar, Cognito Idler/Pitman supports, more to come soon.

1996 K2500 Suburban 7.4L, 265/75R16, Brush Guard, Nerf Bars
lugnut is offline  
post #5 of 7 (permalink) Old 01-08-2011, 04:54 PM
(JESUS)
 
MUDYZER's Avatar
 
Join Date: Nov 2010
Location: gaffney sc
Posts: 189
mine did the same thing about 30minutes ago..i did manage to get my hypertech to communicate (after 4 tries) cleared all 4 codes and drove it a few miles down the road it worked fine...Was told that the hypertech tuners were JUNK! wish i had known that before i bought it. If something happens again i`m sending it back to hypertech and get my money back....scott

2006 ECSB 2500HD 4x4 LBZ 285-75-16 nittos..
Pro-Flo 4" strait piped to 5" tip.
S&B cold air intake...
ALLIGATOR Diesel Tranny Lines....
Cognito pitman/idler arm support kit...
PPE tie rod sleeves....
EFI LIVE....DSP5....Trans Go Jr....thanks Jason
((((( JESUS )))))
MUDYZER is offline  
post #6 of 7 (permalink) Old 01-08-2011, 05:03 PM
Senior Member
 
Join Date: Aug 2008
Location: torbay, newfoundland
Posts: 813
Quote:
Originally Posted by dirtymike View Post
well i bought a hypertech tuner that is supposed to be able to read and clear codes, but it can't read the vin and won't do anything.
does the dtc port have power? check the cigarette lighter, if no power replace the fuse (a blue 15a micro style) in the panel in the engine bay...

2005 LLY C+ SB-->for sale

2013 LML CC
additions to come soon....
djmercer1 is offline  
post #7 of 7 (permalink) Old 01-23-2012, 07:35 PM
DuramaxForum n00b
 
Join Date: Nov 2010
Posts: 22
yes i have power to the cigarette lighter and have checked all the fuses

01 chevy 4x4 ,Leveled out ,Tinted windows, Air intake ,efi live ,MA 700 , straight pipe ,Fass ,125% injectors ,Danville charger in progress
tookin2themax is offline  
Sponsored Links
Advertisement
 
Reply
Gear in this thread - Powered by O'Reilly Auto Parts

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevy and GMC Duramax Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

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:
OR

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.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome