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Ask Fix-it.. Your Own Question
Fix-it.., Commercial Transport Technician
Category: RV
Satisfied Customers: 1232
Experience:  15 yrs. experience as Class A Motor Home chassis specialist.
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The Check Trans light comes on. Had it checked out and it is

Customer Question

The Check Trans light comes on. Had it checked out and it is a communication (U0100) problem and they have not been able to check it with the engine running. Have an Allison 2000 trans with a Cummins 300HP engine. Any ideas as to what this may be
Submitted: 1 year ago.
Category: RV
Expert:  Fix-it.. replied 1 year ago.
Good afternoon
What type of chassis is this transmission in?
Customer: replied 1 year ago.
It is on a Freightliner
Expert:  Fix-it.. replied 1 year ago.
OK good
Now the data plug that the mechanic uses to plug in his computer which is usually at the back of the coach or under the dash drivers side.what color is it? Grey or black?
Customer: replied 1 year ago.
Expert:  Fix-it.. replied 1 year ago.
OK the first thing we need to do is quick checks for corrosion / water. Now the fun begins go to the engine ecm and you will see a connector with all black wires and a connector that doesn't. The one that doesn’t undo and inspect make sure all looks OK. If good go to tcu that's the transmission control unit and take a look at the connectors there and even make sure they are plugged in all the way. On the shift controller do you have the key Pad or shifter style