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Symptom: P0850-PARK/NEUTRAL SWITCH PERFORMANCE When Monitored and Set Condition: P0850-PARK/NEUTRAL SWITCH PERFORMANCE When Monitored: Continuously with the transmission in Park, Neutral, or Drive and NOT in Limp-in mode. Set Condition: The PCM detects an incorrect Park/Neutral switch state for a given mode of vehicle operation. Two Trip Fault. POSSIBLE CAUSES GOOD TRIP EQUAL TO ZERO TRANSMISSION DTC(S) PCM TEST ACTION APPLICABILITY 1 NOTE: Check the TCM for DTCs. Diagnose any DTCs related to the TRS that t can not communicate with the TCM refer to the Communication Category and preform the appropriate symptom. t, read PCM DTCs and record the related Freeze Frame data. Is the Good Trip displayed and equal to zero? All Yes → Go To 2 No → Refer to the INTERMITTENT CONDITION symptom in the Driveability category. 2 Turn the ignition on. t, check the Transmission DTCs. Are there any Transmission DTCs present? All Yes → Refer to the appropriate Transmission DTC in the Transmission category. No → NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as 254 DRIVEABILITY - NGC |