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.
Medium severity. Can I keep driving?Drive gently to a repair shop. If it slips, you hear clunks, or it loses its gears, do not keep driving.
Symptoms
- Engine or ready mode does not start in P/N
- 12 V battery drains while parked
- Warning about gear or park position
Most 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
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
What each character of P084F means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- 8: Transmission
- 4F: Specific fault in that system
Frequently asked questions
Can I keep driving with code P084F?
Drive gently to a repair shop. If it slips, you hear clunks, or it loses its gears, do not keep driving.
What causes code P084F?
The most common causes are: p/N output line or connector open or shorted; module software misjudging the output; output driver in the module faulty.
Related codes
- P0850Park/Neutral Switch Input Circuit
- P0817Starter Disable Circuit/Open
- P081AStarter Disable Circuit Low
- P081BStarter Disable Circuit High
- P081CPark Input Circuit
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.