Powertrain, generic · Transmission
P084F Park/Neutral Switch Output Circuit
Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo
P084F concerns an output: a gearbox, hybrid or selector module passes the park/neutral status as a switched signal to other modules, for example for start release. The module watches its own driver for open circuits and shorts. Stellantis names the code for the 2019 Pacifica plug-in hybrid, where it came with a software fault that drained the 12 V battery; a hybrid control update fixes it. Saab's gearbox module reports the same kind of P/N output to the engine module under P081A/P081B. Strategy and MIL status are not published.
Likely causes
P/N output line or connector open or shorted
Module software misjudging the output
Output driver in the module faulty
Receiving module pulls the line wrongly
Symptoms
- Engine or ready mode does not start in P/N
- 12 V battery drains while parked
- Warning about gear or park position
Repair estimate
DifficultyMediumWorkshop job
Parts and labour€80–600
Time0.5–2.5 h
Typical range across vehicles; the real cost depends on what the testing finds.
Parts involved
park neutral switchswitch wiringtransmission control modulehybrid control module
Related codes
References: static.nhtsa.gov, saabwisonline.com, saabwisonline.com.