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Old 01-10-2020, 09:35 AM   #1 (permalink)
george18
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Code U0073 control module bus off

Yesterday while driving home, I stop at a red light. When I take of the truck jerks like it just down shifted and the dash lights up with a message, Service stabilitrac and service traction control. I stop at a gas station turn it off for a few minutes turn it back on, and all is clear. I get home hook up the obd2 and nothing. This morning while driving to work, the engine light comes on. I hook the obd2 up and itís throwing the U0073 control module communication bus off. Has anyone seen or heard of this yet. Taking it to the dealer this afternoon, but any prior info will help.

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Old 01-10-2020, 09:58 AM   #2 (permalink)
OkDually
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Sounds like a harness rub issue.
On the right side off the bell housing there is a harness that is fixed to a bracket and atached to the housing via a stud.
It is mounted in such a way that the harness gets pressed into that stud and will rub, causing the stabilitrac messsage.

Service bulletin PIP5416A addresses this issue

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File Type: pdf PIP5416A.pdf (406.7 KB, 5 views)
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Old 01-10-2020, 12:59 PM   #3 (permalink)
george18
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Thanks for the info. I will find out what mechanics say it is this afternoon. If it is that, GM has some splaining to do. That bulletin was put out in 2016 and mine is 2018. Seems like it should have been corrected long ago. Hopefully it covered by warranty too.
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Old 01-10-2020, 01:17 PM   #4 (permalink)
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Quote:
Originally Posted by george18 View Post
Thanks for the info. I will find out what mechanics say it is this afternoon. If it is that, GM has some splaining to do. That bulletin was put out in 2016 and mine is 2018. Seems like it should have been corrected long ago. Hopefully it covered by warranty too.
Correct, that is for the 16' model year but your issue mimics the same as the 16'.

The Tech will probably assume the same and hunt for the rub through harness wire(s)
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1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
Diamond Eye 4" Turbo Back Exhaust w/2.5" Flo-Pro Crossover
AirDog II DF165 w/ tank sock delete - XDP
TD-Max boost controller - Kennedy Diesel
OPS extension hose - Leroy Diesel
Glow Plug Harness- PT Wiring Solutions
Glowshift Maxtow EGT,Boost, Fuel gauges
Boost & Fuel Pressure Bolts - Leroy Diesel
2/0 Battery Cable Upgrade - PT Wiring Solutions
PMD w/#9 resistor and Re-Location Kit, mounted to bumper - Leroy Diesel
GM-5 Turbocharger
4.10 gear ratio
OptiLube Winter Formula


Proud member #1039 of The 3500 Dually Club

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Old 01-10-2020, 07:07 PM   #5 (permalink)
george18
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Well, the tech didn’t find anything. He checked all the wiring harnesses found nothing. He said there were some more passed codes stored too, but couldn’t find anything. He deleted the U0073 code and went for a drive, but nothing. I hope it was just a glitch. I will find out as I continue to drive it I guess��
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Old 01-10-2020, 07:20 PM   #6 (permalink)
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Quote:
Originally Posted by george18 View Post
Well, the tech didnít find anything. He checked all the wiring harnesses found nothing. He said there were some more passed codes stored too, but couldnít find anything. He deleted the U0073 code and went for a drive, but nothing. I hope it was just a glitch. I will find out as I continue to drive it I guess��
Keep us up to date if you find out anything more.

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1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
Diamond Eye 4" Turbo Back Exhaust w/2.5" Flo-Pro Crossover
AirDog II DF165 w/ tank sock delete - XDP
TD-Max boost controller - Kennedy Diesel
OPS extension hose - Leroy Diesel
Glow Plug Harness- PT Wiring Solutions
Glowshift Maxtow EGT,Boost, Fuel gauges
Boost & Fuel Pressure Bolts - Leroy Diesel
2/0 Battery Cable Upgrade - PT Wiring Solutions
PMD w/#9 resistor and Re-Location Kit, mounted to bumper - Leroy Diesel
GM-5 Turbocharger
4.10 gear ratio
OptiLube Winter Formula


Proud member #1039 of The 3500 Dually Club

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Old 01-10-2020, 07:24 PM   #7 (permalink)
george18
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Will do.
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Old 01-24-2020, 09:37 AM   #8 (permalink)
george18
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It happened again. This time I used my obdII to delete the code. I did realize this time it was after it was raining and humidity was still high. I don’t remember the weather conditions when it happened last. It is supposed to rain today, so if it happens after that I am guessing moisture might be the cause.
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Old 01-24-2020, 09:58 AM   #9 (permalink)
OkDually
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Quote:
Originally Posted by george18 View Post
It happened again. This time I used my obdII to delete the code. I did realize this time it was after it was raining and humidity was still high. I donít remember the weather conditions when it happened last. It is supposed to rain today, so if it happens after that I am guessing moisture might be the cause.
Yes, it sounds like moisture getting inside of a connector.
__________________
1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
Diamond Eye 4" Turbo Back Exhaust w/2.5" Flo-Pro Crossover
AirDog II DF165 w/ tank sock delete - XDP
TD-Max boost controller - Kennedy Diesel
OPS extension hose - Leroy Diesel
Glow Plug Harness- PT Wiring Solutions
Glowshift Maxtow EGT,Boost, Fuel gauges
Boost & Fuel Pressure Bolts - Leroy Diesel
2/0 Battery Cable Upgrade - PT Wiring Solutions
PMD w/#9 resistor and Re-Location Kit, mounted to bumper - Leroy Diesel
GM-5 Turbocharger
4.10 gear ratio
OptiLube Winter Formula


Proud member #1039 of The 3500 Dually Club

Online   Reply With Quote Quick reply to this message
Old 02-04-2020, 11:31 PM   #10 (permalink)
george18
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It did it again to me tonight. Same codes and message with stabilitrac. It also said my power steering was malfunctioning and to drive careful, plus the tach and speedometer started going haywire and jumping all around. One time when I slowed down to turn the transmission felt like it downshifted really hard and fast. I will take it back to the shop tomorrow. This is starting to piss me off. To much electrical stuff in vehicles these days.

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