P0851 2016 GMC Sierra Code - Park/Neutral Position Switch Circuit Low Voltage
Quick Answer
The P0851 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates an issue with the Park/Neutral Position (PNP) switch circuit having low voltage. Common causes include Damaged or corroded wiring in the PNP switch circuit, Faulty Park/Neutral Position (PNP) switch, Poor electrical connection to the PNP switch. 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 2016 GMC Sierra indicates Park/Neutral Position Switch Circuit Low Voltage.
- Common causes
- Common causes include Damaged or corroded wiring in the PNP switch circuit, Faulty Park/Neutral Position (PNP) switch, Poor electrical connection to the PNP switch.
- 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.
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Code P0851 2016 GMC Sierra Description
The P0851 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates an issue with the Park/Neutral Position (PNP) switch circuit having low voltage. The PNP switch, also known as the transmission range sensor, is responsible for informing the vehicle's computer about the gear position (Park, Neutral, Drive, Reverse, etc.). When the PNP switch circuit detects low voltage, it means that there is a problem with the electrical signal being sent to the vehicle's computer, which can lead to incorrect gear selection or failure to start the engine.
Common Causes of P0851 2016 GMC Sierra
- Damaged or corroded wiring in the PNP switch circuit
- Faulty Park/Neutral Position (PNP) switch
- Poor electrical connection to the PNP switch
- Malfunctioning transmission control module
- Water or debris intrusion affecting the PNP switch circuit
Symptoms of P0851 2016 GMC Sierra
- Difficulty starting the vehicle
- Incorrect gear selection on the instrument panel
- Inability to shift gears
- Engine stalling when shifting gears
- Check Engine Light illuminated on the dashboard
How to Fix P0851 2016 GMC Sierra
- Diagnose the issue by using a scan tool to retrieve the trouble codes and perform a thorough inspection of the PNP switch circuit.
- Check the wiring and connections for any damage, corrosion, or loose connections. Repair or replace as needed.
- Test the Park/Neutral Position (PNP) switch for proper operation. Replace if faulty.
- Clear the DTCs from the vehicle's computer and perform a test drive to ensure the issue is resolved.
- If the problem persists, further diagnostics may be required to identify any underlying issues with the transmission control module or other related components.
Cost to Fix P0851 2016 GMC Sierra
The typical repair costs for addressing a P0851 code on a 2016 GMC Sierra can range from $150 to $400, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check local rates for a more precise estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less.
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