P0851 Saturn Code - Park/Neutral Position Switch Circuit Low Voltage
Quick Answer
The P0851 diagnostic trouble code (DTC) for Saturn vehicles indicates a problem with the Park/Neutral Position (PNP) switch circuit, specifically a low voltage issue. Common causes include Faulty PNP switch, Wiring issues (corrosion, damaged connections), Malfunctioning 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 Saturn indicates Park/Neutral Position Switch Circuit Low Voltage.
- Common causes
- Common causes include Faulty PNP switch, Wiring issues (corrosion, damaged connections), Malfunctioning 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 Saturn Description
The P0851 diagnostic trouble code (DTC) for Saturn vehicles 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 responsible for telling the engine control module (ECM) what gear the transmission is in. When the ECM detects a low voltage signal from the PNP switch circuit, it can lead to issues with starting the vehicle, shifting gears, and overall transmission performance.
Common Causes of P0851 Saturn
- Faulty PNP switch
- Wiring issues (corrosion, damaged connections)
- Malfunctioning ECM
- Electrical problems
- Loose or disconnected wiring
Symptoms of P0851 Saturn
- Difficulty starting the vehicle
- Inability to shift gears
- Vehicle stuck in one gear
- Check Engine Light illuminated on the dashboard
How to Fix P0851 Saturn
- Begin by diagnosing the PNP switch circuit with a multimeter to determine if the voltage is indeed low.
- Inspect the wiring connections for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
- Test the PNP switch for proper functionality and replace if faulty.
- Clear the DTC from the ECM using an OBD-II scanner and test drive the vehicle to ensure the issue has been resolved.
- If the problem persists, further diagnostics may be needed to identify any underlying issues with the ECM or other related components.
Cost to Fix P0851 Saturn
The typical repair costs for addressing a P0851 code on a Saturn vehicle can vary depending on the specific cause of the issue. In general, replacing a faulty PNP switch or repairing wiring connections can cost between $150 and $300. However, if the ECM needs to be replaced, the cost can range from $500 to $1000 or more. Labor rates at auto repair shops typically range from $80 to $150 per hour, but can vary based on location and shop rates. It's advisable to consult with a trusted mechanic for a more accurate cost estimate based on your vehicle's specific needs.
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Frequently Asked Questions about P0851 Saturn Code
1. What are the common symptoms of OBDII code P0851 in a Saturn related to the Park/Neutral Position Switch Circuit Low Voltage?
- Common symptoms include difficulty starting the vehicle, intermittent stalling, or the inability to shift gears.
2. What are the possible causes of the OBDII code P0851 in a Saturn?
- The code P0851 in a Saturn is often caused by a faulty park/neutral position switch, damaged wiring or connectors, or a malfunctioning transmission range sensor.
3. How can I diagnose the OBDII code P0851 in my Saturn?
- Diagnosing the code P0851 involves conducting a thorough inspection of the park/neutral position switch, checking the wiring and connectors for damage, and testing the transmission range sensor for proper functionality.
4. Can I still drive my Saturn with the OBDII code P0851 present?
- It is not recommended to drive your Saturn with the OBDII code P0851 present, as it can lead to potential safety hazards or further damage to the vehicle's transmission system.
5. How can I repair the OBDII code P0851 in my Saturn?
- Repairing the code P0851 typically involves replacing the faulty park/neutral position switch, repairing any damaged wiring or connectors, or recalibrating the transmission range sensor.
6. Is it necessary to reset the OBDII code P0851 after making repairs to my Saturn?
- Yes, it is important to reset the OBDII code P0851 after making repairs to clear the fault code from the vehicle's computer system and ensure proper operation.
7. Can a DIY enthusiast fix the OBDII code P0851 in a Saturn?
- Depending on your experience and knowledge, a DIY enthusiast may be able to diagnose and repair the OBDII code P0851 in a Saturn by following repair guides and using the necessary tools.
8. How much does it typically cost to repair the OBDII code P0851 in a Saturn at a professional auto repair shop?
- The cost of repairing the OBDII code P0851 in a Saturn at a professional auto repair shop can vary, but it may range from $150 to $400, including parts and labor.
9. What other related issues should I be aware of if my Saturn is displaying the OBDII code P0851?
- It is important to also check for any related codes or issues with the transmission system, as they may be interconnected and contribute to the occurrence of the P0851 code.
10. How can I prevent the OBDII code P0851 from reoccurring in my Saturn?
- To prevent the OBDII code P0851 from reoccurring, it is essential to perform regular maintenance on the transmission system, inspect the park/neutral position switch periodically, and address any wiring issues promptly.
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