P0851 2016 Chevrolet Silverado Code - Park/Neutral Position Switch Circuit Low Voltage
Quick Answer
The P0851 diagnostic trouble code (DTC) for a 2016 Chevrolet Silverado indicates a problem with the Park/Neutral Position (PNP) switch circuit, specifically a low voltage issue. Common causes include Faulty Park/Neutral Position (PNP) switch, Damaged wiring or connectors in the circuit, Defective Engine Control Module (ECM). 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 Chevrolet Silverado indicates Park/Neutral Position Switch Circuit Low Voltage.
- Common causes
- Common causes include Faulty Park/Neutral Position (PNP) switch, Damaged wiring or connectors in the circuit, Defective Engine Control Module (ECM).
- 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 Chevrolet Silverado Description
The P0851 diagnostic trouble code (DTC) for a 2016 Chevrolet Silverado indicates a problem with the Park/Neutral Position (PNP) switch circuit, specifically a low voltage issue. The PNP switch, also known as the transmission range sensor, is a vital component that informs the engine control module (ECM) of the transmission gear position. The switch is typically located on the transmission housing and is responsible for ensuring that the vehicle can only be started in Park or Neutral.
Common Causes of P0851 2016 Chevrolet Silverado
- Faulty Park/Neutral Position (PNP) switch
- Damaged wiring or connectors in the circuit
- Defective Engine Control Module (ECM)
- Malfunctioning Transmission Control Module (TCM)
- Corrosion or poor connections in the circuit
Symptoms of P0851 2016 Chevrolet Silverado
- Difficulty shifting gears
- Inability to start the engine
- Vehicle stalling
- Check engine light illuminated
- Transmission not engaging properly
How to Fix P0851 2016 Chevrolet Silverado
- Diagnose the P0851 code using a scan tool to determine the exact cause of the low voltage issue.
- Inspect the wiring and connectors in the PNP switch circuit for any damage or corrosion.
- Test the PNP switch using a multimeter to check for proper voltage output.
- Replace the faulty PNP switch if necessary and clear the DTC from the ECM memory.
- Test drive the vehicle to ensure the issue has been resolved and the symptoms have been eliminated.
Cost to Fix P0851 2016 Chevrolet Silverado
The typical repair costs for addressing a P0851 code on a 2016 Chevrolet Silverado can range from $150 to $400, including parts and labor. However, it's important to note that specific diagnosis time and labor rates at auto repair shops can vary based on location, vehicle make and model, and engine type. Auto repair shops commonly charge between $80 and $150 per hour for labor, but rates may be higher in metropolitan areas or at dealerships, while independent shops may offer lower rates. It is recommended to inquire about local rates for a more accurate estimate.
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Frequently Asked Questions about P0851 2016 Chevrolet Silverado Code
What does OBDII code P0851 mean on a 2016 Chevrolet Silverado?
P0851 indicates a "Park/Neutral Position Switch Circuit Low Voltage" issue, meaning the vehicle's computer has detected a low voltage signal from the park/neutral position switch circuit.
What are the symptoms of code P0851 in a 2016 Chevrolet Silverado?
Common symptoms include the inability to start the engine, improper transmission shifting, illuminated check engine light, or the vehicle starting only in certain gears.
What causes the P0851 code to appear?
Possible causes include a faulty park/neutral position switch, damaged wiring or connectors, short circuits, or issues with the transmission control module (TCM).
Can I drive my 2016 Silverado with a P0851 code?
It is not recommended to drive the vehicle with this code, as it may result in erratic shifting, starting issues, or potential safety concerns.
How do I fix the P0851 code on my Silverado?
Repairs may include replacing the park/neutral position switch, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming the TCM if necessary.
Where is the park/neutral position switch located on a 2016 Silverado?
The park/neutral position switch is typically located on the transmission, near the gear selector linkage.
How do I diagnose the P0851 code on my Silverado?
Start by using an OBDII scanner to confirm the code, then inspect the park/neutral position switch, wiring, and connectors for damage or corrosion.
Can a dead battery cause the P0851 code?
A weak or dead battery is unlikely to directly cause this code, but low voltage in the electrical system could contribute to related issues.
Is replacing the park/neutral position switch expensive?
The cost varies, but replacing the switch typically ranges from $100 to $300, including parts and labor, depending on the location and service provider.
Will clearing the code fix the issue permanently?
Clearing the code may temporarily remove the warning light, but the underlying issue must be addressed to prevent the code from returning.
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