P0850: Park/Neutral Switch Input Circuit
What Does P0850 Mean?
P0850 is a diagnostic trouble code indicating: Park/Neutral Switch Input Circuit. This code relates to the transmission system. It has been reported in NHTSA complaints across 3 different vehicle models.
Symptoms of P0850
- ⚠️ Check engine light illuminated
- ⚠️ Hesitation during acceleration
P0850 Reports by Year
Real Owner Reports
From NHTSA complaint database — actual owner descriptions.
"ONSET OF ISSUE WAS INSPECTION TO DETERMINE SERVICE ENGINE LIGHT. CODE P0850 - INDICATED PARK/NEUTRAL SAFETY SWITCH INPUT CIRCUIT. SWITCH REPLACED AND SERVICE ENGINE LIGHT BACK ON WITHIN 48 HOURS. RETURNED ADDITIONAL CODES RELATED TO TRANSMISSION. CONCURRENTLY THE VEHICLE WAS STUMBLING AT CERTAIN SPE"
— Nissan Pathfinder owner, 05/14/2015
"A) AT 9+ MILES SHIFTER MECHANISM NOT RECOGNIZING I WAS IN DRIVE MODE OR STARTED WITH I-KEY ERROR, GRADUATED TO OBD CODE P0850 OVER THE NEXT FEW MILES. I WAS TOLD THE FOB NEEDED TO BE PROGRAMMED. CRUISE CONTROL NOT WORKING, TURNED OUT THE SHIFTER MECHANISM WAS AT FAULT - DOES NOT RECOGNIZE VEHICLE IS"
— Nissan Pathfinder owner, 02/10/2014
"I BOUGHT A 2014 NISSAN PATHFINDER PLATINUM WITH 9 MILES, I DROVE IT HOME APPROX. 50 MILES AND FOUND I WAS GETTING I-KEY SYSTEM ERROR. DEALER INSTRUCTED ME IT WAS THE FOB PROGRAMMING ERROR, THEN THEY INSPECTED THE CAR AND TOLD ME A TRANSMISSION SWITCH WAS DEFECTIVE WHICH PREVENTED THE ECM TO RECOGNIZ"
— Nissan Pathfinder owner, 02/21/2014
Source: NHTSA Complaints Database
Most Reported Vehicles for P0850
Based on NHTSA owner complaint data.
| # | Vehicle | Reports |
|---|---|---|
| 1 | NISSAN PATHFINDER | |
| 2 | FORD FOCUS | |
| 3 | CHRYSLER 300 |
P0850 Reports by Vehicle
Detailed NHTSA complaint analysis for each vehicle model.
Frequently Asked Questions
Is it safe to drive with this transmission code?
Do I need a full transmission rebuild?
How much does a transmission repair cost?
What To Do Next
Possible Fixes
- 🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
- 🔧 Check transmission fluid level and condition; top off or change if needed
- 🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)
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1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
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Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.