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Old 07-09-2019, 06:00 AM   #1
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Allison Trans Fault

After leaving our last two multi day full hookup campsites, within a mile or so I get the yellow transmission symbol on the dash and shortly thereafter transmission will not up shift. I stopped and had two codes on the ScanGauge which I then cleared. After clearing the codes (or maybe just stopping) the transmission worked flawlessly for the rest of the day.

Yesterday I went to Clarkís Power Service in Knoxville, TN to have it diagnosed. Their scan showed low voltage codes. The tech then checked the battery terminals and a ground was very slightly loose. He said he has seen this affect Allisonís as they are very sensitive to grounds. Other than that there were no issues.

Since this is a voltage issue and only happens first thing in the morning, I am thinking my now 2 1/2 year old chassis batteries may be getting tired. I will have to watch my voltage readings when we leave Friday morning.

Ps. Premier Freightliner in Knoxville, who I used for my transmission re-tune and were great was slammed Monday morning sent me to Clarkís Power Service. Clarks took me right to diagnose and the tech spent more than 30 minutes with me. The tech would not accept a tip and I was not charged. Wow! I would not hesitate to use either of these shops in the future.
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Old 07-09-2019, 07:00 AM   #2
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Love it when business's are understanding to customers issues and treat them fairly. Unfortunately we normally only hear the negative and not enough of us toot the horn for great customer service. Thanks for sharing Mark.

I will reach in and check my chassis batteries to be sure they are tighten down.
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Old 07-09-2019, 07:23 AM   #3
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A loose ground connection does not equal a bad battery, it equals a loose ground connection. Unless you have abused your chassis batteries by fully discharging them several times I wouldn't worry about them unless there are other issues down the road. If you want to make double sure have the shop load the batteries, but from your description of the issue and its resolution I think your problem is solved. Just what I'd do.
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Old 07-09-2019, 07:35 AM   #4
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A loose ground connection does not equal a bad battery, it equals a loose ground connection. Unless you have abused your chassis batteries by fully discharging them several times I wouldn't worry about them unless there are other issues down the road. If you want to make double sure have the shop load the batteries, but from your description of the issue and its resolution I think your problem is solved. Just what I'd do.
I have noticed after starting the engine, the voltage drops to about 11.7 before going up to 14.2. Not sure if thatís normal.
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Old 07-09-2019, 08:06 AM   #5
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... Their scan showed low voltage codes. The tech then checked the battery terminals and a ground was very slightly loose. He said he has seen this affect Allisonís as they are very sensitive to grounds. Other than that there were no issues.

Since this is a voltage issue and only happens first thing in the morning, I am thinking my now 2 1/2 year old chassis batteries may be getting tired. I will have to watch my voltage readings when we leave Friday morning.
OK more questions for ya... Which ground connection was loose? The chassis batteries are tied together with a bus and a bunch of cables are then connected to the ground bus. If it is one of the connecting cables, you could have a low voltage situation (especially when the intake heater is cycling on/off during warmup) I would have your chassis batteries tested, I had one go bad on us last year (while the other was still good) but the bad battery had a shorted cell and it drew down the other since they are connected in parallel.
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Old 07-09-2019, 01:11 PM   #6
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OK more questions for ya... Which ground connection was loose? The chassis batteries are tied together with a bus and a bunch of cables are then connected to the ground bus. If it is one of the connecting cables, you could have a low voltage situation (especially when the intake heater is cycling on/off during warmup) I would have your chassis batteries tested, I had one go bad on us last year (while the other was still good) but the bad battery had a shorted cell and it drew down the other since they are connected in parallel.
This one was wiggleable, but he snugged the others up as well. I would not have thought it would make a difference but we will see.
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Old 07-09-2019, 02:49 PM   #7
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... Since this is a voltage issue and only happens first thing in the morning, I am thinking my now 2 1/2 year old chassis batteries may be getting tired. I will have to watch my voltage readings when we leave Friday morning. ...
Hi Mark,


If I remember correctly, you ordered your Seneca (like I did) so it didn't sit in a dealers lot for a year without being run. That, along with our Senecas being on a constant charge (stored at home), I am expecting 5 years out of my chassis batteries before I start being proactive about replacement. I keep an eye on sitting voltage (engine not running, not hooked up to shore power) with a volt meter about once a month.
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Old 07-09-2019, 08:24 PM   #8
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This one was wiggleable, but he snugged the others up as well. I would not have thought it would make a difference but we will see.
Our Intake heaters can draw 95A + from each of them. Considering that you say the chassis voltage cycles to 11.7V... that is much lower than the 12.4 that my dash reading is when it is 10F at startup.

If the code clears in the next few days... I would think that the loose battery connection would be the culprit. Now tell me that they also looked and tightened the + terminals too ????
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Old 07-09-2019, 08:44 PM   #9
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Hi Mark,


If I remember correctly, you ordered your Seneca (like I did) so it didn't sit in a dealers lot for a year without being run. That, along with our Senecas being on a constant charge (stored at home), I am expecting 5 years out of my chassis batteries before I start being proactive about replacement. I keep an eye on sitting voltage (engine not running, not hooked up to shore power) with a volt meter about once a month.
Have you looked for the date on your chassis batteries? They are all made by Alliance Truck parts... Ours were dated almost a year before the chassis build date.
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Old 07-10-2019, 07:14 AM   #10
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Our Intake heaters can draw 95A + from each of them. Considering that you say the chassis voltage cycles to 11.7V... that is much lower than the 12.4 that my dash reading is when it is 10F at startup.

If the code clears in the next few days... I would think that the loose battery connection would be the culprit. Now tell me that they also looked and tightened the + terminals too ????
Yes, he checked all the terminals. At first I was worried that this might be related to adding the OD switch, but tech said it was low voltage. We will see.
I will double check everything and the dates when we are home in about in about two weeks.
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