Tow / Haul - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY 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.

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post #1 of 6 (permalink) Old 12-15-2019, 06:41 PM Thread Starter
 
Join Date: Dec 2018
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Tow / Haul

Hey Guys, I'm , having a transmission issue.
Started around 2 months ago
Trans temp gauge quit working
Gear indicator light quit working
Tow / Haul lights up on dash, but isn't working
Overdrive lock out lights up on dash but doesn't work
Doesn't want to downshift, when going up hills, or after slowing down. sometimes it does, sometimes it doesn't

What should I bee looking for

2004 Silverado 3500
11ft. Utility Body
all original intake
Replaced water pump at 170,000 Miles
Rebuilt Transmission at 330,000 miles
Rebuilt turbo at 375,000 Miles
Replaced water pump at 400,000 Miles
Replaced Fuel injectors and CP3 at 499,300 Miles
Currently showing 532,000 Miles
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post #2 of 6 (permalink) Old 12-16-2019, 05:44 AM
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Location: Central Arizona
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First thing for me is always to check electrical (plugs at the TCM and Trans) Kinda sounds like too many 'trans' things all at once to not be electrical, or a failing TCM.

2004.5 Silverado CCSB LLY
Sinister EGR delete,
S&B air box and up-sized S&B intake mouthpiece,
CAT converter delete,
ATP 5 stage tune - Edge CST w/ EGT and backup camera,
5" AFE Power full exhaust kit
Airlift 5000# bags w/ on-board remote compressor

Just a nice CLEAN stock truck for towing the toys to the playground with a back seat full of grandkids
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post #3 of 6 (permalink) Old 12-16-2019, 07:42 AM
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Location: Maurice, LA
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First check the condition of all the wiring around your transmission.
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2008 Silverado 2500HD CCSB LTZ Diesel
FASS 95 Lift Pump (with Baldwin filters), Edge Insight CTS Monitor on a Windshield Mount, Nicktane Fuel Filter Adapter w/ CAT 306-9199 UHE tertiary fuel filter, Bilstein 5100 Stock Height, Bushwacker Bed Rail Caps, AMP Research Bedstep, Fumoto oil drain valve, Dorman PS Oil cooler, Pioneer AVIC 7200NEX GPS/Stereo, Air Lift LoadLifter 5000 Air Bags.
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post #4 of 6 (permalink) Old 12-16-2019, 10:26 AM
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Location: Jax, FL
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As the other guys have already pointed out, check all of the wiring going into the tranny.

If the wiring shows no signs of damage, you are most likely looking at a bad TCM, especially considering the miles on your truck if the TCM hasn't been replaced already.

09 GMC SLT Dually
Steel Gray Metallic
All options except sunroof

Mods so far:

Alcoa 19.5s with Michelin XZE, Centramatics,Tow Mirrors, Chrome Grill Overlay, Rear underseat storage, Mudflaps all corners, 20% Window tint, 6" Oval Steps, B&W Turnover Hitch, B&W Companion Hitch, Sulastics, GM Campaign #PIT3009J, Wireless Console Charging, Bilstein 5100s, Raptor 3602RL
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post #5 of 6 (permalink) Old 12-16-2019, 05:46 PM
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Join Date: Oct 2013
Location: Ontario, Canada
Posts: 76
th plumber,

That temp gauge is an easy stepper motor replacement fix, if you can do soldering of electronics.

Several YouTube video how to's and the stepper motors (one for each dial on the dash) are cheap to buy on eBay, 8 for $12 or so. Took me about an hour to pull the instrument panel, take the thing apart, solder in 3 stepper motors for the ones that quit, and reassemble everything.

2005 GMC 3500 Dually SLT,4x4,CC, LB, Auto, AFE Mouth Piece,Banks Six Gun Tuner, Banks intercooler & Exhaust
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post #6 of 6 (permalink) Old 12-19-2019, 07:09 PM Thread Starter
 
Join Date: Dec 2018
Posts: 2
Thanks, for the replies guys!
The guys at Leadfoot Diesel told me that their scan tool couldn't communicate with the transmission. Since I'm trying to get through a busy stretch, and it's not really affecting anything, I told them I would bring it in later in January. Said they think its a plug inside the trans and they would have to drop the pan to get to it.
I have seen a couple of posts where there was a dead wire from the tcm to the trans, and the dealer mechanic spliced in a new wire.
I think I will leave it to the pros and I'll stick to Plumbing!

2004 Silverado 3500
11ft. Utility Body
all original intake
Replaced water pump at 170,000 Miles
Rebuilt Transmission at 330,000 miles
Rebuilt turbo at 375,000 Miles
Replaced water pump at 400,000 Miles
Replaced Fuel injectors and CP3 at 499,300 Miles
Currently showing 532,000 Miles
th plumber is offline  
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