P0851 2015 Chevrolet Silverado Code - Park/Neutral Position Switch Circuit Low Voltage
Quick Answer
The P0851 diagnostic trouble code (DTC) for a 2015 Chevrolet Silverado indicates a problem with the Park/Neutral Position (PNP) switch circuit having low voltage. Common causes include Damaged wiring or connectors in the PNP switch circuit, Faulty PNP switch, Issues with the 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 2015 Chevrolet Silverado indicates Park/Neutral Position Switch Circuit Low Voltage.
- Common causes
- Common causes include Damaged wiring or connectors in the PNP switch circuit, Faulty PNP switch, Issues with the 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 2015 Chevrolet Silverado Description
The P0851 diagnostic trouble code (DTC) for a 2015 Chevrolet Silverado indicates a problem 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 system about the gear position selected by the driver, such as Park, Neutral, Drive, Reverse, etc. When the PNP switch circuit detects low voltage, it means that there is an issue with the electrical signal being sent from the switch to the engine control module (ECM).
Common Causes of P0851 2015 Chevrolet Silverado
- Damaged wiring or connectors in the PNP switch circuit
- Faulty PNP switch
- Issues with the ECM
- Corrosion or moisture in the electrical connections
- Poor electrical ground connections
Symptoms of P0851 2015 Chevrolet Silverado
- Difficulty starting the vehicle
- Inaccurate gear display on the dashboard
- Erratic shifting behavior
- Engine stalling when shifting gears
- Inability to start the engine
How to Fix P0851 2015 Chevrolet Silverado
- Begin by conducting a thorough visual inspection of the PNP switch circuit, looking for any damaged wiring, connectors, or signs of corrosion.
- Test the PNP switch using a multimeter to check for proper voltage output in each gear position.
- If the PNP switch is faulty, replace it with a new one following the manufacturer's guidelines.
- Check and clean any electrical connections related to the PNP switch to ensure proper signal transmission.
- Clear the DTC from the ECM memory using a diagnostic scanner and perform a test drive to verify that the issue has been resolved.
Cost to Fix P0851 2015 Chevrolet Silverado
The typical repair costs for addressing a P0851 code on a 2015 Chevrolet Silverado can vary depending on the specific cause of the issue. In general, replacing a faulty PNP switch or repairing damaged wiring/connectors can range from $150 to $400, including parts and labor. However, it's important to note that 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 recommended to check with local repair shops for a more accurate estimate.
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