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  1. O

    Allison limp mode when cold start

    Okay today it was 18 degrees. Truck started fine. battery voltage was 11.7 volts according to my Edge. The check engine light came on when voltage showed 12.1 volts. I don't think the voltage had anything to do with it but I recorded it anyways. I got the same codes again. I checked the fluid...
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    Allison limp mode when cold start

    Dieseladdiction do you have any value to add? As you can see I copied the post from a year ago. I replaced both batteries and yes they run down after setting for a week or so in the cold but not in the summer. It almost seems like lower voltage is causing the trans to throw codes and go into...
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    Allison limp mode when cold start

    Cold temps Allison limp mode Well I hadn't had a problem since last winter. This winter when it gets around or below 31 degrees my check engine light comes on when I start my truck and transmission is in limp mode. The fluid level is spot on. I have a 2006 GMC 3500. My tranny is rebuilt using...
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    Allison limp mode when cold start

    I had it built by a Clarke technician that has built hundreds of Allison trans. We used the SunCoast GMAX6PAC kit, ML converter and all brand new Allison solenoids. Not sure about taps but the tranny was done almost 2 years ago and has maybe 15,000 miles on it since full rebuild. Gonna check...
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    Allison limp mode when cold start

    Thanks Mike, I will recheck the levels again. I have checked and I am pretty sure it was fine. I believe you told me a while back to make sure it was half way between the hash marks. It would be very hard to check it at 175 degrees right now as it is only 30 degrees. I did start it up after it...
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    Allison limp mode when cold start

    I have a 2006 GMC 3500. My tranny is rebuilt using a Suncoast GMAX6pac and has a ml converter. I also have ml tranny cooler. It has been going into limp mode as soon as I start it up when it is cold outside. I have tried to start it up and let it set running to warm it up and when I go get in...
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    Allison 6sp: Codes, No Gears

    06 GMC 3500 allison in limp mode I have a 2006 GMC 3500. My tranny is rebuilt using a Suncoast GMAX6pac and has a ml converter. I also have ml tranny cooler. It has been going into limp mode as soon as I start it up when it is cold outside. I have tried to start it up and let it set running...
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