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
may have set in the TCM.
Ignition on, engine not running.
NOTE: Before continuing, ensure that communication can be established
with the TCM. If the DRBIIIt can not communicate with the TCM refer to
the Communication Category and preform the appropriate symptom.
With the DRBIIIt, 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.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
2 Turn the ignition on.
With the DRBIIIt, check the Transmission DTCs.
Are there any Transmission DTCs present?
All
Yes → Refer to the appropriate Transmission DTC in the Transmission
category.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → NOTE: Before continuing, check the PCM harness connector
terminals for corrosion, damage, or terminal push out. Repair as
necessary. Replace and program the Powertrain Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
246
DRIVEABILITY - NGC
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