P1899 Park/Neutral Switch Stuck In Park or Gear

SYMPTOM
P-1899 P/N SWITCH STUCK IN PARK OR GEAR

WHEN MONITORED
With the transmission in Park, Neutral, or Drive and not in limp-in mode.

SET CONDITION
This code is set if the PCM detects an incorrect Park/Neutral switch state for a given mode of vehicle operation.

POSSIBLE CAUSES
- Park/Neutral switch sense circuit open (TRS)
- Park/Neutral switch sense circuit short to ground
- Park/Neutral switch wiring harness observable def
- Park/Neutral switch defective
- PCM defective (P/N switch)