Hey guys
From time to time when I’m trying to put the transmission into drive or reverse nothing happens and it just beeps at me
It only happens when the weather is cold… And if the truck sits for 10 or 15 hours
Sometimes when I’m in reverse and try to put the truck into neutral, once I turn the shifter selector button to neutral it stays in reverse and check engine light comes on
The code is SPN 525 FMI 7
It goes away by itself in 3 to 5 seconds and then it shifts into neutral
any ideas?
Transmission issue DT12
Discussion in 'Freightliner Forum' started by cernim, Feb 20, 2020.
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Attached Files:
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If your truck is a 2014 - 2016, it will probably need a split pin bushing. That was a problem with early DT12.
BUMBACLADWAR Thanks this. -
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Here is the diagnostic steps for SPN 525 FMI 7.
Attached Files:
jsnell Thanks this. -
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These transmissions rely on clean dry air,
Should be changing air drier cartridge yearly. Moisture in the air system is not good on the little passages and valves trying to shift the truck. More than likely moisture in the air system. Not bashing you but I don’t know why people let the air system go on trucks. So easy to stay on top off. -
You ware abele to find solution? I have same problem. 2015
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