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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.
GOOD TRIP EQUAL TO ZERO
TRANSMISSION DTC(S)
PCM
TEST
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 DRBIII can not communicate with the TCM refer to
the Communication Category and preform the appropriate symptom.
With the DRBIII , read PCM DTCs and record the related Freeze Frame data.
Is the Good Trip displayed and equal to zero?
Yes → Go To 2
→ Refer to the INTERMITTENT CONDITION symptom in the
No
2
Turn the ignition on.
With the DRBIII , check the Transmission DTCs.
Are there any Transmission DTCs present?
Yes → Refer to the appropriate Transmission DTC in the Transmission
→ NOTE: Before continuing, check the PCM harness connector
No
POSSIBLE CAUSES
ACTION
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
category.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
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.
DRIVEABILITY - NGC
255
APPLICABILITY
All
All
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