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Old 12-28-2016, 07:12 PM   #11
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The Allison tech said the International has less frequent problems with harnesses than the Kodiak. The Chevy tech mentioned harness abrasion and movement that causes problems. I can see first hand the abrasion on the main braid where it has wore away the finish on the inside of the engine hood. The Chevy tech has also seen battery cables in need of replacement due to abrasion from the chassis.
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Old 12-29-2016, 02:14 PM   #12
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After reading "Christmas crash" obviously I don't have much of a problem. Thank God they are all safe.
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Old 12-29-2016, 02:46 PM   #13
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After reading "Christmas crash" obviously I don't have much of a problem. Thank God they are all safe.
Being "upright" is alright in my book too!
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Old 12-29-2016, 02:48 PM   #14
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I don't have a MH but do have an 03 GMC 4500 Duramax/Allison 1000 and a couple other GM Duramax/Allison trucks at work. On the 4500/5500 chassis there is a main harness leading from the ECM/TCM down to the trans. Goes from the passenger side firewall down past the removable fender liner and on down to the bellhousing. GM had a known abrasion issue with that section of the harness. I've repaired it on ours once myself and my dealer has done it another 2 times. All 3 times it has caused shifting/no shift issues and multiple trans codes. Another very common failure point is the park/neutral switch mounted directly on the trans at the shifter pin. It's a common issue on all GM automatics largely due to poor sealing and proximity to road spray. When it fails it can also result in abnormal or no shift issues and is typically accompanied by a malfunctioning "PRNDL" display on the dash.

In general these were pretty poorly built cabs by GM. The chassis, engine, transmission, axles, etc. are stout but the cabs and associated harnesses/parts hailed from the dark days of GM. We are moving away from all the 4500-8500 series chassis we have in favor of Ford and International because the GM stuff just doesn't hold up, at least in commercial use.
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Old 12-30-2016, 01:41 PM   #15
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Just left the Chevy dealer. They found some green wires(corroded) in the harness and fixed that. When trying to download the information from the TCM it appeared to be "faulty".They have to order the new TCM from an Allison dealer and send my old one back to have the proper sim information downloaded into the new TCM. I called the Allison Global Headquarters and was told this is correct. Only an Allison dealer can do this process. I questioned the reliability of their trans. He told me the trans itself is quite durable but they had issues with the electronics and wiring. He gave me the part # for their updated TCM, that he said had alot of the bugs ironed out. No matter the problem, if the vehicle is dead in the water the reliability is suspect. There is the age factor-2008- but the rig has been gently used with only 35K for mileage. The time frame now is over 2 weeks and I am not sure of the cost. We have rented an Enterprise car and leaving for Florida tonight. I will drive back up when its done.
Adventures in RVing-to be continued.
P.S. Does what I described sound familiar and correct?
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Old 12-30-2016, 02:20 PM   #16
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Thanks for the follow up Capt Rich.
Our '07 chassis has 30K on it now so we will look for any signs of what you have mentioned.
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Old 12-30-2016, 02:38 PM   #17
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No matter the problem, if the vehicle is dead in the water the reliability is suspect. There is the age factor-2008- but the rig has been gently used with only 35K for mileage. The time frame now is over 2 weeks and I am not sure of the cost. We have rented an Enterprise car and leaving for Florida tonight. I will drive back up when its done.
Adventures in RVing-to be continued.
P.S. Does what I described sound familiar and correct?
As I mentioned earlier you seem to be the "Lone Ranger" with this issue. The people I know with similar units range in age from 05 and up and mileage in the 50-80 k range or higher and none have had a similar problem. ????
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Old 02-05-2017, 07:45 AM   #18
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llstate can go blank themselves.
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Old 02-05-2017, 08:04 AM   #19
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Hello All. I drove the rental car back up north on Jan, 17th. I went to Christiansen Chevrolet and talked to the mechanic. He showed me the 10 pin harness and the 3 female connections that were green corrosion. He said this probably short circuited the TCM and caused the trans to fail. They replaced the 10 pin harness and an updated TCM as advised by Allison. They also replaced the fuel filter and #4 glo plug as it was detected on a diagnostic test. $1700.00 and change later the rig ran flawlessly. 1350 miles back home and the trans shifted smoothly and went thru the Cumberland Gap at a sustained 50 MPH. Christiansen Chevrolet in Highland Ind. could not have been more gracious. They left us spend the first night camped out in their parking lot. The work took awhile because they had to order the TCM. The next road trip is over to Naples, Fl. towing a 20Ft. auto hauler, about 350 miles roud trip. I will report back after the cruise.
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Old 02-05-2017, 08:23 AM   #20
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We are glad to hear you were able to get it resolved.
Thanks for the followup.
Happy travels!
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