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Engine-Codes – Subaru – P0852 Subaru

P0852 Subaru Code - Park/Neutral Position Switch Circuit High Voltage

Quick Answer

The P0852 diagnostic trouble code (DTC) for Subaru vehicles indicates a problem with the Park/Neutral Position Switch Circuit High Voltage. Common causes include Faulty Park/Neutral Position Switch, Wiring or connector issues in the circuit, Corrosion or damage to the switch or 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
P0852 Subaru indicates Park/Neutral Position Switch Circuit High Voltage.
Common causes
Common causes include Faulty Park/Neutral Position Switch, Wiring or connector issues in the circuit, Corrosion or damage to the switch or 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.
What is this?
Table of contents Created and updated by William Orellana on Aug 18, 2024
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Code P0852 Subaru Description

The P0852 diagnostic trouble code (DTC) for Subaru vehicles indicates a problem with the Park/Neutral Position Switch Circuit High Voltage. This switch, also known as the transmission range sensor, is responsible for informing the engine control module (ECM) of the gear position selected by the driver. When the ECM detects a high voltage signal from this switch, it triggers the P0852 code. This issue can lead to incorrect gear selection, causing the vehicle to not start or shift gears properly.

OBDII Code P0852 Subaru - Park/Neutral Position Switch Circuit High Voltage
P0852 Subaru Code - Park/Neutral Position Switch Circuit High Voltage

Common Causes of P0852 Subaru

  1. Faulty Park/Neutral Position Switch
  2. Wiring or connector issues in the circuit
  3. Corrosion or damage to the switch or circuit
  4. ECM malfunction
  5. Transmission fluid leakage onto the switch

Symptoms of P0852 Subaru

  1. Difficulty starting the vehicle
  2. Inability to shift gears
  3. Engine stalling when shifting gears
  4. Harsh shifting or erratic transmission behavior
  5. Illumination of the Check Engine Light

How to Fix P0852 Subaru

  1. Diagnose the issue by using a scan tool to check for the P0852 code and perform a visual inspection of the Park/Neutral Position Switch and related wiring.
  2. Test the switch using a multimeter to determine if it is sending the correct voltage signals.
  3. Replace the faulty Park/Neutral Position Switch if it fails the voltage test.
  4. Inspect and repair any damaged wiring or connectors in the circuit.
  5. Clear the DTC and test drive the vehicle to ensure the issue is resolved.

Cost to Fix P0852 Subaru

The cost of repairing a P0852 Subaru code can vary depending on the specific cause of the issue. On average, replacing the Park/Neutral Position Switch can range from $100 to $300, including parts and labor. Additional costs may apply if there are wiring repairs or ECM diagnostics required. It is recommended to consult with a trusted mechanic or dealership for a more accurate cost estimate based on your vehicle's make and model.

What does this mean?

Tech Notes for P0852 Subaru

There is a Factory Service Bulletin for the following Subaru models:
2005-2008 Subaru Legacy
2005-2008 Subaru Outback
2005-2008 Subaru Impreza
2005-2008 Subaru Forester
Subaru Factory Service Bulletin OBDII Code P0852

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0852 Subaru Code

1. What are common symptoms of OBDII code P0852 in a Subaru related to the Park/Neutral Position Switch Circuit High Voltage?

The common symptoms include difficulty starting the vehicle, the engine not cranking, the inability to shift out of Park, and the Check Engine Light being illuminated.

2. What are the possible causes of OBDII code P0852 in a Subaru?

The potential causes of this code include a faulty park/neutral position switch, damaged wiring or connectors in the circuit, a corroded switch terminal, or a malfunctioning PCM.

3. How can I diagnose the OBDII code P0852 in my Subaru?

You can diagnose this code by using a scan tool to read the code, checking the park/neutral position switch for proper operation, inspecting the wiring and connectors for any damage, and testing the voltage in the circuit.

4. Can I drive my Subaru with the OBDII code P0852 present?

It is not recommended to drive the vehicle with this code present, as it can lead to issues with starting the engine or shifting gears, potentially causing safety hazards.

5. How can I repair OBDII code P0852 in my Subaru?

To repair this code, you may need to replace the park/neutral position switch, repair any damaged wiring or connectors, clean any corroded terminals, and clear the code from the system using a scan tool.

6. Are there any DIY tips for fixing OBDII code P0852 in a Subaru?

While some basic troubleshooting steps can be done at home, it is recommended to consult a professional mechanic for proper diagnosis and repair of this code to ensure safety and accuracy.

7. Is OBDII code P0852 specific to Subarus only?

No, OBDII code P0852 related to the Park/Neutral Position Switch Circuit High Voltage can occur in various vehicle makes and models, not just limited to Subarus.

8. Can a faulty park/neutral position switch cause other issues in my Subaru?

Yes, a faulty park/neutral position switch can cause issues with starting the engine, shifting gears, and even affect the transmission's operation in a Subaru.

9. Will resetting the OBDII code P0852 clear the issue permanently?

Resetting the code may temporarily clear the Check Engine Light, but if the underlying issue causing the code is not addressed and repaired, it is likely to reoccur in the future.

10. How much does it typically cost to repair OBDII code P0852 in a Subaru?

The cost of repairing this code can vary depending on the extent of the issue and whether you do the repairs yourself or take the vehicle to a mechanic. It may involve parts replacement, wiring repairs, and diagnostic labor fees.

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