P0851
Park/Neutral Switch Input Circuit Low
P0851 is an OBD-II diagnostic trouble code meaning: Park/Neutral Switch Input Circuit Low. Common causes: faulty park/neutral switch, open or short circuit in the circuit. Estimated repair cost: $6–33.
Symptoms
- Problems starting the engine
- Unstable operation at idle
- Activating emergency mode
- Check Engine Light Is On
- Inability to change gears
Causes
- Faulty park/neutral switch
- Open or short circuit in the circuit
- Poor contact in connectors
- Engine control unit (ECU) malfunction
- Wiring harness damage
How to Fix
- Check the condition of the park/neutral switch
- Inspect the circuit for breaks or short circuits
- Check contacts in connectors
- Test the operation of the engine control unit
- Replace damaged components
Related codes
Error P0851 by Vehicle Brand
FAQ
What does the P0851 code mean?
P0851 is an OBD-II diagnostic trouble code that indicates: Park/Neutral Switch Input Circuit Low
What causes a P0851 error code?
The most common causes of P0851 include: Faulty park/neutral switch; Open or short circuit in the circuit; Poor contact in connectors; Engine control unit (ECU) malfunction.
How do I fix a P0851 diagnostic trouble code?
To fix P0851: Check the condition of the park/neutral switch. Inspect the circuit for breaks or short circuits. Check contacts in connectors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0851?
Yes, but get it checked soon
How much does it cost to fix P0851?
The estimated repair cost for P0851 is $6–33. Actual cost depends on your vehicle, location, and labor rates.
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