Duramax Diesels Forum Truck of the Week
  #1  
Old 10-06-2019, 08:43 PM
Racerrich08's Avatar
Racerrich08 Racerrich08 is offline
FNG
 
Join Date: Oct 2019
Location: Michigan
Posts: 26
Angry No cruise control

Hi I have a 03 lb7 and I cant figure out what's wrong with my cc
I watch it on my snapon scanner shows the on /off is working the accel and deaxcel is working and that the set button is working but where it says cc engaged it says no and I replaced the break switch please help me figure this out. I do a lot of highway driving

Last edited by Racerrich08; 10-06-2019 at 08:56 PM.
Reply With Quote
  #2  
Old 10-07-2019, 04:28 AM
Stingpuller's Avatar
Stingpuller Stingpuller is offline
The Pusher Man
 
Join Date: Jan 2007
Location: central Ohio
Posts: 2,126

Default Cruise control

Does it by chance have LED tail lights?
__________________
2007 GMC c4500 Regency Western Hauler 235" Powerflow Dragster Powerflow, Howards rods,Arias piston,Fleece custom daul CP3, Fleece custom 80mm single turbo, Fleece injectors, 9" rear end, SoCal Diesel, Hughes powerglide, Mike's Race Wiring, Fuelabs pump, Ny-trex nitrous, Isspro gauges and Hamilton Cams thanks Zach
Reply With Quote
  #3  
Old 10-07-2019, 10:52 AM
Racerrich08's Avatar
Racerrich08 Racerrich08 is offline
FNG
 
Join Date: Oct 2019
Location: Michigan
Posts: 26
Default

No LEDs lighs

Sent from my SM-G965U using Tapatalk
Reply With Quote
  #4  
Old 10-07-2019, 10:57 AM
RickDLance's Avatar
RickDLance RickDLance is offline
Vendor
 
Join Date: Feb 2007
Posts: 1,162
Default

Any codes? Sometimes a code can cause the cruise not to works?
__________________

www.ProFabPerformance.com

We also handle S & B filters, Air Dog lift pumps, and Kraftwerks Superchargers.

Special Thanks to those that continue to help me!!
Danville Performance, SoCal Diesel, Vibrant Performance!!
Reply With Quote
  #5  
Old 10-07-2019, 11:01 AM
Racerrich08's Avatar
Racerrich08 Racerrich08 is offline
FNG
 
Join Date: Oct 2019
Location: Michigan
Posts: 26
Default

No codes

Sent from my SM-G965U using Tapatalk
Reply With Quote
  #6  
Old 10-07-2019, 03:29 PM
TheBac's Avatar
TheBac TheBac is offline
Why do I keep doing this?


 
Join Date: Apr 2008
Location: Mid Michigan
Posts: 12,641

Default

Moved to LB7 section
__________________
Tom
"BBT" -- 2003 GMC CC/SB 4x4 12.14@111.15
"The Cruzer" -- 2014 Chevy Cruze Diesel -- the DD
"Kleshay" -- 2000 C5 Corvette -- the toy

Marlene (Molly) Bacon -- 1936 - 2019 -- RIP Mom You're already missed, at home and on the piano.

Two wrongs dont make a right, but three rights do make a left.
Reality is a matter of perspective.
This forum isn't for the weak of heart.....or wallet.
"Lets build a race car they said. Itll be fun they said. I don't know who "they" are.........but they need a good punch in the face!" -- mufflerguy (yb)
Reply With Quote
  #7  
Old 10-07-2019, 03:53 PM
snowman22's Avatar
snowman22 snowman22 is offline
Hotrodder
 
Join Date: Jan 2018
Location: SoCal
Posts: 206
Default

I would expect a code, but are all the wheel speed sensors reading near the same accurate value?
__________________
2015.5 LML GMC Denali 3500 SRW 4wd CCLB 100k Miles
Mike L Trans, 4" FlowPro, MBRP Down Pipe, 30" FTE Resonator, S&B Intake, Twin Kennedy Pumps, Bilstein 5100, Poly U/LCA Bushings, Kryptonite Tie Rods, EBC Sport Rotors Yellow Pads, Edge CTS2
Reply With Quote
  #8  
Old 10-07-2019, 04:44 PM
Racerrich08's Avatar
Racerrich08 Racerrich08 is offline
FNG
 
Join Date: Oct 2019
Location: Michigan
Posts: 26
Default

Yes they are

Sent from my SM-G965U using Tapatalk
Reply With Quote
  #9  
Old 10-07-2019, 07:23 PM
darkness's Avatar
darkness darkness is offline
Hotrodder

 
Join Date: Jul 2009
Location: vegas
Posts: 654

Default

Pull any fuses for the trailer plug and see if that fixes it.
__________________
Rob
2004 2500hd GMC. Mike L. trans, EPR twins. 620hp/1100tq. bought new in June 2004. Sold on 12/28/16 .
2007 classic 2500hd Chevy (Blacula) bought 3/16/18.
Rare parts steering w/DHD brace, egr delete, pcv re-route, BD lift pump, duramaxtuner perfect tow tune.
Reply With Quote
  #10  
Old 10-07-2019, 07:28 PM
Racerrich08's Avatar
Racerrich08 Racerrich08 is offline
FNG
 
Join Date: Oct 2019
Location: Michigan
Posts: 26
Default

I unplugged it from the back

Sent from my SM-G965U using Tapatalk
Reply With Quote
  #11  
Old 10-07-2019, 07:32 PM
Chevy1925's Avatar
Chevy1925 Chevy1925 is offline
don't know sh!t about IFS

 
Join Date: Oct 2009
Location: Phoenix Az
Posts: 16,091

Default

You need to check every single fuse under the hood and inside
__________________
Quote:
Originally Posted by JoshH View Post
Mike L is my role model. I want to be like him when I grow up.
James

02 LB7, LLY, LBZ, LMM, LML, L5P 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
Tailgate Crew Member #4
Reply With Quote
  #12  
Old 10-07-2019, 07:33 PM
Racerrich08's Avatar
Racerrich08 Racerrich08 is offline
FNG
 
Join Date: Oct 2019
Location: Michigan
Posts: 26
Default

I did inside and outside of truck

Sent from my SM-G965U using Tapatalk
Reply With Quote
  #13  
Old 10-07-2019, 07:59 PM
dndj's Avatar
dndj dndj is online now
Boost!
 
Join Date: Apr 2019
Location: Oregon
Posts: 29

Default

Quote:
Originally Posted by Racerrich08 View Post
I did inside and outside of truck

Sent from my SM-G965U using Tapatalk
FSM says the ECM inhibits cruise control operation when any of the following conditions exist:
  • A cruise control module DTC (trouble code) is set
  • Vehicle speed < 25mph
  • Vehicle is in Park, Neutral, Reverse, or 1st gear
  • Engine RPM is low
  • Engine RPM is high
  • Vehicle speed is too high
  • System voltage not between 12 and 16v DC
  • ABS/traction control active for more than 2 seconds

Maybe one of these things is sending a false or erroneous signal to the cruise unit. Not real helpful of GM to describe what "too low" or "too high" means either.
__________________
2003 (LB7) 3500 dually EC/LB->FB, Allison by Scott @ SDP, PPEI tuned, AD100 LP, Banks Intake+4" exhaust,CTS2
Reply With Quote
  #14  
Old 10-07-2019, 08:03 PM
Racerrich08's Avatar
Racerrich08 Racerrich08 is offline
FNG
 
Join Date: Oct 2019
Location: Michigan
Posts: 26
Default

I'm going to get a wiring diagram in the morning

Sent from my SM-G965U using Tapatalk
Reply With Quote
  #15  
Old 10-07-2019, 08:15 PM
dndj's Avatar
dndj dndj is online now
Boost!
 
Join Date: Apr 2019
Location: Oregon
Posts: 29

Default Schematic

Here you go. Let me know if you want the ABS schematic too which includes the brake light/TCC switch combo on the pedal.
Attached Images
File Type: jpg IMG_2526a.jpg (211.0 KB, 24 views)
__________________
2003 (LB7) 3500 dually EC/LB->FB, Allison by Scott @ SDP, PPEI tuned, AD100 LP, Banks Intake+4" exhaust,CTS2
Reply With Quote
Reply


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

Posting Rules
You may not post new threads
You may not 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


All times are GMT -7. The time now is 05:54 PM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
vB.Sponsors