P0850 2009 Nissan Altima Sedan Code - Park/Neutral Switch
Quick Answer
When the shift position is P or N, Park/Neutral Position (PNP) switch is turned ON. Common causes include Misadjusted Park/Neutral Switch, Faulty Park/Neutral Switch, Park/Neutral Switch harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0850 2009 Nissan Altima Sedan indicates Park/Neutral Switch.
- Common causes
- Common causes include Misadjusted Park/Neutral Switch, Faulty Park/Neutral Switch, Park/Neutral Switch harness is open or shorted.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0850 2009 Nissan Altima Sedan Description
The Park/Neutral Position (PNP) switch assembly also indicates a transmission range switch to detect shift lever position.
What are the Possible Causes of the DTC P0850 2009 Nissan Altima Sedan?
- Misadjusted Park/Neutral Switch
- Faulty Park/Neutral Switch
- Park/Neutral Switch harness is open or shorted
- Park/Neutral Switch circuit poor electrical connection
- Combination meter
- TCM (CVT models)
How to Fix the DTC P0850 2009 Nissan Altima Sedan?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0850 2009 Nissan Altima Sedan code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0850 2009 Nissan Altima Sedan Code
1. What does OBDII code P0850 mean on a 2009 Nissan Altima Sedan?
P0850 indicates a problem with the Park/Neutral Switch Input Circuit, which monitors the gear position to ensure the vehicle is in park or neutral before starting.
2. What are the common symptoms of code P0850 in a 2009 Nissan Altima?
Symptoms may include the engine not starting, transmission not shifting properly, or the Check Engine Light illuminating.
3. What causes the P0850 code to appear on a 2009 Nissan Altima?
Common causes include a faulty park/neutral position switch, damaged wiring or connectors, or issues with the transmission control module (TCM).
4. How do I diagnose the P0850 code in my Nissan Altima?
Diagnose it by checking the park/neutral switch for proper operation, inspecting related wiring and connectors for damage, and using a scan tool to monitor the switch's input signal.
5. Can a bad park/neutral switch prevent my Altima from starting?
Yes, if the switch fails to send the correct signal, the vehicle may not recognize it is in park or neutral, preventing the engine from starting.
6. Is it safe to drive with the P0850 code active?
Driving with the P0850 code is not recommended, as it may lead to starting issues or improper transmission operation, which can be unsafe.
7. How much does it cost to fix the P0850 code on a 2009 Nissan Altima?
Repair costs can range from $100 to $300, depending on whether the issue is with the switch itself, wiring, or connectors.
8. Can I fix the P0850 code on my Altima myself?
If you're comfortable with basic electrical diagnostics and repairs, you may be able to fix it by replacing the park/neutral switch or repairing damaged wiring.
9. How do I reset the Check Engine Light after fixing the P0850 code?
Use an OBDII scan tool to clear the code, or disconnect the battery for a few minutes. Ensure the issue is resolved before resetting.
10. What happens if I ignore the P0850 code on my 2009 Nissan Altima?
Ignoring the code may lead to worsening starting issues, potential transmission problems, and reduced vehicle reliability over time.
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