Hagar1
Senior Member
- Joined
- Aug 9, 2023
- Posts
- 1,090
- Reaction score
- 2,268
- Location
- Ontario Canada
- Ram Year
- 2012 Ram 1500
- Engine
- Hemi 5.7
This is a long shot but I have a FC U0401 in the "drive train" module. the rest of the system is clean, no codes anywhere. I'm wanting to check the Data bus circuit but can't get any clear info on voltages. All I was able to find is that one side should be no lower than 2 volts and the other side should not be over 4 volts. Can anyone clear this up for me and tell me if these voltages should be readable with the key on but engine off.
The engine runs horribly until it warms up, so much so that after start, it is not driveable for a minute or two. Will not respond to throttle input, and sputters, spits and pops back into the intake.
I have replaced all 4 O2 sensors, MAP, Crank and Cam, Spark plugs, PCM (from Flagship 1) Compression is all in the 145 range.
Thanks!
The engine runs horribly until it warms up, so much so that after start, it is not driveable for a minute or two. Will not respond to throttle input, and sputters, spits and pops back into the intake.
I have replaced all 4 O2 sensors, MAP, Crank and Cam, Spark plugs, PCM (from Flagship 1) Compression is all in the 145 range.
Thanks!
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