P0851 2018 Chevrolet Silverado Code - Park/Neutral Position Switch Circuit Low Voltage
Quick Answer
The diagnostic trouble code P0851 for a 2018 Chevrolet Silverado indicates a problem with the Park/Neutral Position (PNP) switch circuit being detected as low voltage. Common causes include Faulty Park/Neutral Position switch, Damaged wiring or connectors in the switch circuit, Corrosion or moisture in the switch circuit. 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
- P0851 2018 Chevrolet Silverado indicates Park/Neutral Position Switch Circuit Low Voltage.
- Common causes
- Common causes include Faulty Park/Neutral Position switch, Damaged wiring or connectors in the switch circuit, Corrosion or moisture in the switch circuit.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P0851 2018 Chevrolet Silverado Description
The diagnostic trouble code P0851 for a 2018 Chevrolet Silverado indicates a problem with the Park/Neutral Position (PNP) switch circuit being detected as low voltage. The PNP switch, also known as the neutral safety switch, is responsible for detecting the position of the gear selector (Park or Neutral) and communicating this information to the vehicle's engine control module (ECM). When the switch circuit registers low voltage, it can lead to issues with starting the vehicle, as the ECM may not receive the correct signal to engage the starter motor.
Common Causes of P0851 2018 Chevrolet Silverado
- Faulty Park/Neutral Position switch
- Damaged wiring or connectors in the switch circuit
- Corrosion or moisture in the switch circuit
- ECM malfunction
- Poor electrical connection in the circuit
Symptoms of P0851 2018 Chevrolet Silverado
- Difficulty starting the vehicle
- Inability to shift out of Park
- Dashboard warning light indicating transmission issue
- Engine stalling when shifting gears
- Unintended vehicle movement when parked
How to Fix P0851 2018 Chevrolet Silverado
- Begin by diagnosing the PNP switch circuit using a diagnostic scan tool to confirm the P0851 code.
- Inspect the wiring and connectors for any damage or corrosion, repairing or replacing as necessary.
- Test the PNP switch for proper functionality and replace if found to be faulty.
- Clear the trouble code from the ECM memory using the diagnostic scan tool.
- Test drive the vehicle to ensure the issue has been resolved and the code does not return.
Cost to Fix P0851 2018 Chevrolet Silverado
The typical repair costs for addressing a P0851 code on a 2018 Chevrolet Silverado can range from $100 to $300, depending on the specific cause of the issue and the cost of parts and labor in your area. It's important to factor in additional diagnostic time and potential fees for reprogramming the ECM if needed. As labor rates can vary, it's recommended to obtain quotes from local auto repair shops for a more accurate estimate.
Need more information about the P0851 2018 Chevrolet Silverado code?
Need more information on how to fix the P0851 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0851 2018 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0851 2018 Chevrolet Silverado Code
No Frequently Asked Questions about P0851 2018 Chevrolet Silverado Code found.
Discuss the causes and fixes for P0851 2018 Chevrolet Silverado OBDII Code
Code P0851 2018 Chevrolet Silverado comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.