Medium and Heavy Trucks
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Hi Antonio, My name is***** are known for wiring harness issues at the shifter and range switches. Look for damaged or corroded wiring. If okay and the switches test okay the solenoid are also known to fail. You can swap them and see if the problem moves with them. Do you have any fault codes? Let me know
While you are there grab the complete model number from the ID tag and any fault codes you have logged as well.
Interesting.... The transmission most of the time will throw a code if it picks up an issue. Let me know how the solenoid swap goes. Also test both for resistance or OHMs and see if they both read the same or very close. Inspect the wiring harness as well.