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A cheap oscilloscope from Amazon is basically showing only some barely detectable background voltage. Nothing meaningful on that BUS LIN.

Where did you connect and with what tool did you measure 10V on LIN bus?

I’ll hook it up to an oscilloscope tomorrow. I’ll let you know what I find. Thanks for all the good advice.

Electronic clamp multimeter

Even though some people reported U11E9 code with LIN bus voltage of 9V and mine is barely detectable I think it’s pretty evident that my ECU is bad. Replacing one is easy but programming keys etc is a chore. Any tips?

The LIN bus voltage on my truck varies between 6.3mV (milivolts) with the ignition off to 8mV with the engine running.

Are you saying that voltage on the LIN bus should be around 12V? Some say it should be around 9V. I’ll be checking mine today and will report asap.

I’m in Illinois. I positively have no automated chin spoiler on my truck. I’m the first owner so I know it was never there.

I’d love to leave it alone except it throws the U11E9 code which illuminates CEL and prevents remote start. Also, with CEL, you can’t pass state emission test. It’s a problem.

Hi Kapinallinen2, I logged into Alldata (super helpful) and determined that my specific truck (e-torque, limited) only uses that LIN bus to operate AGS unless I’m missing something. Limited doesn’t have the chin spoiler (air dam) and I don’t have the temperature controlled diff so no three way...

Thanks! That is so helpful! I haven’t disconnected anything yet as I did not know that other systems are on the same LIN bus. I will sign up to Alldata and try to get this fixed once and for all. This has been by far the most frustrating issue on my Ram to date and It looks like a fairly common...

The damn U11E9 code had me take the entire front grille off (so unnecessarily complicated), replace the AGS motor, replace the pig tail connector to the AGS motor and the code hasn’t disappeared. I ran continuity test from AGS motor plug back to a first major harness connector located behind the...

Thanks for all your input. I checked all connectors on the harness and the PCM. All seem ok. Everything is clean and free of any corrosion. One sizable connector is located under the left front head lamp behind the bumper. Weird placement for a big connector as water will hit it all the time...

So either the harness is messed up or the entire PCM needs replacing. That sucks! Normally, I wouldn’t care except here in Chicago remote start in the winter time is a must and with the CEL on, remote start doesn’t work.

My 2019 Ram 1500 Limited also threw a U11E9 code. I decided to replace the grille shutter actuator motor. Removing the front grille on the limited is insane. Even those painted fender flares have to come off. Thanks Ram! Afterwards I erased the code and test drove the truck and the CEL came back...

Wound up buying a barely used rear end for $2300 and swapped it myself. Took me 8 hours to do but still better than paying for a new one at the dealership. I’m trying to give away the one with bad bearing.

2019 Ram 1500 Limited 4x4 5.7L e-torque, 3.92 rear end. My first ever serious issue with this truck started happening at 110k miles. I started noticing a high pitched grinding/whining noises from the back sounding almost like badly worn brake pads. A mechanic at my dealership couldn’t pinpoint...