Hummer Forums by Elcova  
Forums - Home
Source Decals

Source Motors
Custom. Accessories.

H2 Accessories
H3 Accessories
Other Vehicles

H2 Source

H2 Member Photos
H2 Owners Map
H2 Classifieds
H2 Photo Gallery
SUT Photo Gallery
H2 Details

H2 Club

Chapters
Application

H3 Source

H3 Member Photos
H3 Classifieds
H3 Photo Gallery
H3 Owners Map
H3 Details
H3T Concept

H1 Source

H1 Member Photos
H1 Classifieds
H1 Photo Gallery
H1 Details

General Info

Hummer Dealers
Contact
Advertise

Sponsored Ads










 


Source Motors - custom. accessories.


Go Back   Hummer Forums by Elcova > Hummer H2 Discussion Forums > Technical Discussion and Customizing your H2

Reply
 
Thread Tools Search this Thread Display Modes
  #21  
Old 01-21-2014, 01:50 AM
guruerror's Avatar
guruerror guruerror is offline
Hummer Authority
 
Join Date: Jan 2008
Location: Gaithersburg, MD
Posts: 1,762
guruerror is on a distinguished road
Default Re: ABS and TC lights

Quote:
Originally Posted by HUMTECH
And 4 wheel drive buttons still don't work?
Nope. When I press 4HI LOCK or 4LO they just blink for a while and the truck stays in 4WD.

Quote:
Originally Posted by jsbihn
So with the Actron you were able to clear all the code except the U1000 communication code?
So did the lights stay on the dash?
Have you experienced any difference in the way the truck runs?
Do you still have the issue with the transmission not being able to switch out of the selected 4WD?

Also, why do you think a tech2 will perform any different then what your Actron has performed?
The Actron cleared everything that it detected, including the U1000. As soon as I fired the truck back up the ABS, TC, and Parking Brake light all came back on and U1000 reappeared as a 'current' code.

There's nothing different in the way it drives...I just have no ABS nor can I switch 4WD modes. Other than that it runs normal. No 'reduced power', no 'service 4WD' indicators...nothing but these stinking lights.

I believe the Tech2 is better equipped to troubleshoot the problem based on the live data readings from the bus...or lack there of from a specific module.

I wasn't in the mood to fiddle with it today...instead I chose to honor MLK by planting my ass on the couch and playing XBOX.
__________________
CNTRY
DTOM
Reply With Quote
  #22  
Old 01-21-2014, 02:19 AM
jsbihn jsbihn is offline
Moderator
 
Join Date: Jan 2012
Posts: 728
jsbihn is on a distinguished road
Default Re: ABS and TC lights

Quote:
Originally Posted by guruerror
I wasn't in the mood to fiddle with it today...instead I chose to honor MLK by planting my ass on the couch and playing XBOX.

Then you, my friend, have done what almost every person in America that MLK "fought for their rights" have done to "honor" him
So lets crack another 40 in his behalf
__________________
'03 H2 (name: Big Gulp)

Last edited by jsbihn : 01-21-2014 at 02:21 AM.
Reply With Quote
  #23  
Old 03-16-2014, 10:50 PM
BUNNY15's Avatar
BUNNY15 BUNNY15 is offline
Hummer Veteran
 
Join Date: Aug 2011
Location: DFW
Posts: 105
BUNNY15 is on a distinguished road
Default Re: ABS and TC lights

Quote:
Originally Posted by guruerror
Nope. When I press 4HI LOCK or 4LO they just blink for a while and the truck stays in 4WD.


The Actron cleared everything that it detected, including the U1000. As soon as I fired the truck back up the ABS, TC, and Parking Brake light all came back on and U1000 reappeared as a 'current' code.

There's nothing different in the way it drives...I just have no ABS nor can I switch 4WD modes. Other than that it runs normal. No 'reduced power', no 'service 4WD' indicators...nothing but these stinking lights.

I believe the Tech2 is better equipped to troubleshoot the problem based on the live data readings from the bus...or lack there of from a specific module.

I wasn't in the mood to fiddle with it today...instead I chose to honor MLK by planting my ass on the couch and playing XBOX.

Any luck figuring this out? I have the same TC and ABS lights on and no switching into 4H or 4L.
__________________
BUNNY15 aka Tiffany

2003 H2, Moog Idler, Pitman, Up/Low BJ, In/Out TR, Fabtech 6in Lift, Yokohama Geolander M/T 40x15.50x20, Black XD Bombs 20x9, Bilstein 5100 Shocks, Yukon 5:13 gears f/r, Hypertech Max programmer, KC 851 HID's 35w, Pioneer DVD/NAV/TOUCHSC, 10" woofers, 6k Headlight HID's, White LED DRL (wired to run w/headlights on),Custom University of Texas gauges, Custom yellow paint. interior, Fuel pump/filter (Feb '13), Rebuilt 4L60E (April '13) & Rebuilt Transfer Case (Oct '14)
Reply With Quote
  #24  
Old 04-01-2014, 03:25 PM
Ken Bowers Ken Bowers is offline
Hummer Veteran
 
Join Date: Sep 2012
Posts: 61
Ken Bowers is an unknown quantity at this point
Default Re: ABS and TC lights

My orange 2003 Hummer also likes to give me TC and ABS alarms on cold mornings; especially on Monday after the orange H2 has sat without running over the weekend. The alarms clear after the ignition switch is turned off.

I believe it is due to low battery voltage.
Reply With Quote
  #25  
Old 05-16-2014, 03:23 AM
guruerror's Avatar
guruerror guruerror is offline
Hummer Authority
 
Join Date: Jan 2008
Location: Gaithersburg, MD
Posts: 1,762
guruerror is on a distinguished road
Default Re: ABS and TC lights

Quote:
Originally Posted by BUNNY15
Any luck figuring this out? I have the same TC and ABS lights on and no switching into 4H or 4L.
BUNNY...no, I haven't figured it out yet. I personally think I've damaged the ABS module or some other control module from repeatedly running it through deep water. I still get the TC, ABS, and Parking Brake lights...typically all three, sometimes only two of the three; but eventually they all three light up again.

I've been rolling with it as is for a while since it drives fine...and because I have no off-road trips planned until Sept.

I got some additional input on a 'possible' culprit today though. I had to have the evap line for the AC replaced and asked the tech (local Midas shop) to give me his thoughts on my squeaky rear brakes. He said that my rear bearings have some play, which is causing the brakes to make noise at low speeds when applying slight pressure to the pedal. He went on to say that this 'play' could also be throwing my wheel speed sensors out of whack and hence causing the ABS, TC, etc. lights to come on. I passed on the repair for now, but thought it was worth a mention. I'm not sold on the idea that my WSS are causing my particular problem, especially since I also can't shift my transfer case; but what do I know...I'm not a trained mechanic, I'm just working off of layman's logic. EDIT: Actually I take that back...I just re-read some of HUMTECH's comments and he mentioned that I should check the "transfer case speed sensor wiring and connectors"...hmmm...maybe the Midas tech was on to something.

I scored a Tech2 scan tool a while back and plan on probing around in the truck this weekend or next to see what I can turn up on my own to help me diagnose. There's a little bit of a learning curve with the Tech2 'cause there's just so many options it's a bit overwhelming and not something that you can just 'jump right into'...unless you're merely scanning for DTCs.

I know I haven't been on in a while, but will make an effort to post back more results after I get the Tech2 on the truck.
__________________
CNTRY
DTOM

Last edited by guruerror : 05-16-2014 at 03:35 AM.
Reply With Quote
  #26  
Old 05-16-2014, 04:43 AM
HUMTECH's Avatar
HUMTECH HUMTECH is offline
Hummer Authority
 
Join Date: Sep 2003
Location: Canada
Posts: 1,251
HUMTECH is an unknown quantity at this point
Default Re: ABS and TC lights

These DTCs set when the control module does not receive a message that it was expecting from another control module, and does not know which control module did not send that message.

 1. If the DTC U1000 or U1255 is set in history with other DTCs set current or history, diagnose the other DTCs first.
 2. If the DTC U1000 or U1255 set current, this usually indicates a module that is currently not communicating or a configuration issue.
For example, if the control module is configured for an option (ie: Onstar, Keyless Entry, Memory Mirrors, etc.) that the vehicle does not have, it may expect to receive a message regarding this missing feature. This would usually occur due to the control module being recently replaced and incorrectly setup.

 3. When the DTC U1000 or U1255 is current, the module that is not communicating may not even be listed on the Tech 2 on the Diagnostic Circuit Check/Class 2 Message Monitor list.
 4. If the DTC U1000 or U1255 has set in history without other DTCs, replacing the control module setting the DTC is most likely NOT the solution. The module that has set the code is looking for an input from another module that is not communicating. Since the module did not receive an input that it is expecting to see, it sets a U1000 or U1255 which indicates there was a loss of communications. Look at the customer?s complaint (ie: intermittent, erratic tachometer operation); this will probably be a better indication of the control module that is the source of the concern.
__________________
1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
Reply With Quote
  #27  
Old 05-16-2014, 04:47 AM
HUMTECH's Avatar
HUMTECH HUMTECH is offline
Hummer Authority
 
Join Date: Sep 2003
Location: Canada
Posts: 1,251
HUMTECH is an unknown quantity at this point
Default Re: ABS and TC lights

If you don't have any ABS speed sensor codes set in the EBCM its not gonna be a speed sensor problem. If the Midas guy was pulling in and out on the tire and it moves slightly that is normal with a c-clip type semi floating axle
__________________
1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
Reply With Quote
  #28  
Old 05-20-2014, 01:11 PM
guruerror's Avatar
guruerror guruerror is offline
Hummer Authority
 
Join Date: Jan 2008
Location: Gaithersburg, MD
Posts: 1,762
guruerror is on a distinguished road
Default Re: ABS and TC lights

This'll be the weekend to tackle more troubleshooting...

One thing I noticed that probably does rule out WSS...I discovered that Cruise Control is still operational; and from what I've read on other GM forums CC (obviously, I guess) relies on WSS.
__________________
CNTRY
DTOM
Reply With Quote
  #29  
Old 05-25-2014, 03:23 AM
guruerror's Avatar
guruerror guruerror is offline
Hummer Authority
 
Join Date: Jan 2008
Location: Gaithersburg, MD
Posts: 1,762
guruerror is on a distinguished road
Default Re: ABS and TC lights

Okay...I hooked up the Tech 2 and did some rooting around...

Under Powertrain | DTC | DTC Info I pulled U1301 Class 2 High Voltage.
Under Powertrain | ATC DTC Info I pulled U1000 Class 2 Malfunction

Under Body I get two messages before entering the options menu (I'm gonna open another thread on this because I physically removed both of these and just need to get them out of the BCM programming):
OnStar/VCIM not responding
Digital radio receiver not responding

Under Body | SIR I pulled U1000 Class 2 Malfunction, B0100 Air Bag Sensor 1, and B0103 Air Bag Sensor 2 (the air bag codes are probably due to the fact that I just had front end work done due to trail damage...I think they busted both my front sensors.)

When I go under Chassis and try to go under ABS I get a message stating "ABS braking not available when the ABS/TCS lamps are illuminated." Then under ABS it reports "Loss of communication with vehicle"
__________________
CNTRY
DTOM
Reply With Quote
  #30  
Old 05-25-2014, 04:41 AM
HUMTECH's Avatar
HUMTECH HUMTECH is offline
Hummer Authority
 
Join Date: Sep 2003
Location: Canada
Posts: 1,251
HUMTECH is an unknown quantity at this point
Default Re: ABS and TC lights

so you have a U1000 set in the air bag module(SDM)? I would check condition of module as it is located under drivers seat. If you have had water in the truck it will saturate the underlay and corrode the module pretty bad. If its messing up it can pull the class 2 data line down and cause problems on the network
__________________
1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
Reply With Quote
  #31  
Old 05-25-2014, 07:32 PM
guruerror's Avatar
guruerror guruerror is offline
Hummer Authority
 
Join Date: Jan 2008
Location: Gaithersburg, MD
Posts: 1,762
guruerror is on a distinguished road
Default Re: ABS and TC lights

Ug...that's the unit that's under the carpet, right? Well...I never had water in the truck...but if it's not a monumental pain in the ass I guess I'll try an take a look at it.
__________________
CNTRY
DTOM
Reply With Quote
  #32  
Old 07-11-2014, 07:23 AM
BUNNY15's Avatar
BUNNY15 BUNNY15 is offline
Hummer Veteran
 
Join Date: Aug 2011
Location: DFW
Posts: 105
BUNNY15 is on a distinguished road
Default Re: ABS and TC lights

Quote:
Originally Posted by guruerror
BUNNY...no, I haven't figured it out yet. I personally think I've damaged the ABS module or some other control module from repeatedly running it through deep water. I still get the TC, ABS, and Parking Brake lights...typically all three, sometimes only two of the three; but eventually they all three light up again.

I've been rolling with it as is for a while since it drives fine...and because I have no off-road trips planned until Sept.

I got some additional input on a 'possible' culprit today though. I had to have the evap line for the AC replaced and asked the tech (local Midas shop) to give me his thoughts on my squeaky rear brakes. He said that my rear bearings have some play, which is causing the brakes to make noise at low speeds when applying slight pressure to the pedal. He went on to say that this 'play' could also be throwing my wheel speed sensors out of whack and hence causing the ABS, TC, etc. lights to come on. I passed on the repair for now, but thought it was worth a mention. I'm not sold on the idea that my WSS are causing my particular problem, especially since I also can't shift my transfer case; but what do I know...I'm not a trained mechanic, I'm just working off of layman's logic. EDIT: Actually I take that back...I just re-read some of HUMTECH's comments and he mentioned that I should check the "transfer case speed sensor wiring and connectors"...hmmm...maybe the Midas tech was on to something.

I scored a Tech2 scan tool a while back and plan on probing around in the truck this weekend or next to see what I can turn up on my own to help me diagnose. There's a little bit of a learning curve with the Tech2 'cause there's just so many options it's a bit overwhelming and not something that you can just 'jump right into'...unless you're merely scanning for DTCs.

I know I haven't been on in a while, but will make an effort to post back more results after I get the Tech2 on the truck.


My lights are STILL on and on some starts they are off until I drive a few miles, then they come back on and stay on. Idk the problem, but I haven't had a need for 4WD in a while, so it's not the biggest problem to have right now. Need to get it fixed before November though.
__________________
BUNNY15 aka Tiffany

2003 H2, Moog Idler, Pitman, Up/Low BJ, In/Out TR, Fabtech 6in Lift, Yokohama Geolander M/T 40x15.50x20, Black XD Bombs 20x9, Bilstein 5100 Shocks, Yukon 5:13 gears f/r, Hypertech Max programmer, KC 851 HID's 35w, Pioneer DVD/NAV/TOUCHSC, 10" woofers, 6k Headlight HID's, White LED DRL (wired to run w/headlights on),Custom University of Texas gauges, Custom yellow paint. interior, Fuel pump/filter (Feb '13), Rebuilt 4L60E (April '13) & Rebuilt Transfer Case (Oct '14)
Reply With Quote
  #33  
Old 09-04-2014, 02:38 PM
guruerror's Avatar
guruerror guruerror is offline
Hummer Authority
 
Join Date: Jan 2008
Location: Gaithersburg, MD
Posts: 1,762
guruerror is on a distinguished road
Default Re: ABS and TC lights

A little update on this...

I got it in my head this past weekend to double-check all the fuses in the truck...ALL of them...even ones that have nothing to do with ABS or TC. So, I disconnected the positive from the battery and pulled and tested every single fuse from both blocks (under the hood and driver's side dash).

Oddly enough...since I've slapped it all back together I no longer have the TC light. I've still got ABS and BRAKE lit...but NO TC; and it's been about 5 days now. I still can't shift the transfer case...but I thought it was interesting that the TC light went away.

They'll be more updates to come very soon since I finally dropped the truck off at the shop last night to have them diagnose. I'll keep you posted on the outcome.
__________________
CNTRY
DTOM
Reply With Quote
  #34  
Old 09-05-2014, 02:57 PM
guruerror's Avatar
guruerror guruerror is offline
Hummer Authority
 
Join Date: Jan 2008
Location: Gaithersburg, MD
Posts: 1,762
guruerror is on a distinguished road
Default Re: ABS and TC lights

Got the truck back from the dealer yesterday...their diagnosis regarding the ABS/TC lights is that I need a new ABS module AND wiring harness ($1,495 installed).

They went on to say that the ABS/TC issue is NOT related to my inability to shift my transfer case. They said that I need a new encoder motor ($641 installed).

They indicated that both the ABS module and the encoder motor suffer from water damage. While I agree that they have both seen a lot of water I find it hard to believe that they both failed from water damage simultaneously. These components seem to have a fairly water tight construction and the connectors all have water tight grommets and were VERY clean and debris free when I inspected them.

I'm sort of feel like they're using the 'shotgun effect' to fix this problem...basically, replace a bunch of parts to fix one problem instead of figuring out which part is the actual culprit.

I've asked them to send me over a detailed estimate outlining the part numbers for the items that they would recommend replacing...at the very least that will give me a little more to go on. I'll post back once I have that in hand.
__________________
CNTRY
DTOM
Reply With Quote
  #35  
Old 10-13-2014, 07:46 PM
BUNNY15's Avatar
BUNNY15 BUNNY15 is offline
Hummer Veteran
 
Join Date: Aug 2011
Location: DFW
Posts: 105
BUNNY15 is on a distinguished road
Default Re: ABS and TC lights

**UPDATE** After 2 months of being at the shop, I finally picked up my boy 2TUF4U.

So to recap, he was leaking fluid in the driveway pretty heavy. I thought it was tranny fluid, but it turned out to be a cracked T-case. Replaced the entire T-case with a rebuilt one, and also the "extension housing" (?) which was also leaking. No more leak, but T-case switch still blinks and won't shift to 4H or 4L. Rebuilt T-case came with a new encoder motor. The mechanic wasn't sure if it was working, so he ordered another new encoder motor. Still wouldn't engage electronically; however the case could be engaged manually.

Next, purchased a new GM T-case switch from the dealer, installed it and lights still just blink. ABS and TC lights are still on, but remember, the last time they went off, T-case shifted as directed. I am unsure if the lights are related to the switch issue, but it sure seems like it. The dealer said on my 03 model, there is a control module under the dash. Rarely does it go out, but that may be the culprit of the switch failing.

Still uncertain if the two problems are related, but for an$120 diagnostic fee, I guess since it's drive-able now, I will take to the dealer soon.

$1959 dollars later, what's another $120 to know what's wrong exactly.

I'll update once I know something. Hell, maybe I'll pony over another $400 bucks and have the front seat warmers fixed before these TX winters get here
__________________
BUNNY15 aka Tiffany

2003 H2, Moog Idler, Pitman, Up/Low BJ, In/Out TR, Fabtech 6in Lift, Yokohama Geolander M/T 40x15.50x20, Black XD Bombs 20x9, Bilstein 5100 Shocks, Yukon 5:13 gears f/r, Hypertech Max programmer, KC 851 HID's 35w, Pioneer DVD/NAV/TOUCHSC, 10" woofers, 6k Headlight HID's, White LED DRL (wired to run w/headlights on),Custom University of Texas gauges, Custom yellow paint. interior, Fuel pump/filter (Feb '13), Rebuilt 4L60E (April '13) & Rebuilt Transfer Case (Oct '14)
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT +1. The time now is 12:05 PM.


Powered by vBulletin Version 3.0.7
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.