I have pulled and tested the UCM. I am getting 20k resistance on the RH ua2 Y sensor output to UCM ground(CN1A-1). Here is the test from the book: I am getting a correct ( 99.5k ) resistance reading on the other RH ua1 Y sensor output. Here is the test from the book: This discrepancy seems to correlate to the right side driving slower than the left. I do not want to replace the UCM if it is not the root cause of the issue ( or does not fix the issue), but it seems to me that the only option is to replace the UCM. Edit: Also found one ground pin with 2k resistance to pin1 ground. It is CN1A-7. All others have zero resistance to pin1 ground.