P1146 Subaru Code - Pressure Sensor Circuit Range/Performance Problem High Input
Quick Answer
The P1146 Subaru code indicates a Pressure Sensor Circuit Range/Performance Problem with a high input signal. Common causes include Faulty Fuel Tank Pressure Sensor: The sensor itself may be malfunctioning, providing incorrect readings to the ECM, Damaged Sensor Circuit: Wiring or connections related to the fuel tank pressure sensor may be damaged, causing a high input signal, ECM Malfunction: A problem with the engine control module (ECM) could also trigger the P1146 code, as it may not be interpreting the sensor data correctly. 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
- P1146 Subaru indicates Pressure Sensor Circuit Range/Performance Problem High Input.
- Common causes
- Common causes include Faulty Fuel Tank Pressure Sensor: The sensor itself may be malfunctioning, providing incorrect readings to the ECM, Damaged Sensor Circuit: Wiring or connections related to the fuel tank pressure sensor may be damaged, causing a high input signal, ECM Malfunction: A problem with the engine control module (ECM) could also trigger the P1146 code, as it may not be interpreting the sensor data correctly.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P1146 Subaru Description
The P1146 Subaru code indicates a Pressure Sensor Circuit Range/Performance Problem with a high input signal. In Subaru vehicles, this typically refers to an issue with the fuel tank pressure sensor or its circuit. The fuel tank pressure sensor is responsible for monitoring the pressure inside the fuel tank, which helps the engine control module (ECM) adjust the air-fuel mixture for optimal combustion. When the sensor detects a high input signal that is outside the expected range, it triggers the P1146 code.
Common Causes of P1146 Subaru
- Faulty Fuel Tank Pressure Sensor: The sensor itself may be malfunctioning, providing incorrect readings to the ECM.
- Damaged Sensor Circuit: Wiring or connections related to the fuel tank pressure sensor may be damaged, causing a high input signal.
- ECM Malfunction: A problem with the engine control module (ECM) could also trigger the P1146 code, as it may not be interpreting the sensor data correctly.
- Vacuum Leaks: Any leaks in the vacuum system connected to the fuel tank pressure sensor can disrupt pressure readings.
- Fuel Cap Issues: A loose or damaged fuel cap can lead to pressure fluctuations inside the fuel tank, triggering the code.
Symptoms of P1146 Subaru
- Check Engine Light: The most common symptom associated with the P1146 code is the illumination of the check engine light on the dashboard.
- Rough Idle: The engine may experience rough idling or hesitation during acceleration due to incorrect air-fuel mixture adjustments.
- Decreased Fuel Economy: A malfunctioning fuel tank pressure sensor can lead to poor fuel efficiency, causing the vehicle to consume more fuel than usual.
- Engine Stalling: In severe cases, the engine may stall while driving, posing a safety hazard to the driver and passengers.
- Emission Control Issues: The vehicle may fail emissions tests or emit higher levels of pollutants due to incorrect fuel system readings.
How to Fix P1146 Subaru
- Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble code and further investigate the fuel tank pressure sensor and its circuit.
- Inspect Sensor and Circuit: Check the condition of the fuel tank pressure sensor, wiring, and connections for any visible damage or corrosion.
- Replace Faulty Components: If the sensor or circuit is found to be defective, replace the sensor and repair any damaged wiring or connections.
- Clear Codes: After completing the repair, clear the trouble codes from the ECM's memory and perform a test drive to ensure the issue is resolved.
- Retest and Monitor: Monitor the vehicle's performance and check for any recurring codes to confirm that the repair was successful.
Cost to Fix P1146 Subaru
The cost of repairing a P1146 Subaru code can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay anywhere from $150 to $400 for parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can fluctuate, so it's advisable to obtain quotes from multiple sources to get an accurate estimate. Additionally, factors such as the vehicle's make and model, the location of the repair shop, and the severity of the issue can also influence the final cost.
Need more information about the P1146 Subaru code?
Need more information on how to fix the P1146 Subaru code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1146 Subaru code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P1146 Subaru Code
1. What are the common symptoms of OBDII code P1146 in a Subaru?
- Common symptoms include poor engine performance, decreased fuel efficiency, rough idling, and the illumination of the check engine light.
2. What could cause the OBDII code P1146 to trigger in a Subaru?
- The code P1146 in a Subaru is typically triggered by a faulty pressure sensor, wiring issues, vacuum leaks, or a malfunctioning electronic control module (ECM).
3. How can I diagnose the Pressure Sensor Circuit Range/Performance Problem High Input in my Subaru?
- Diagnosis involves using a scan tool to read the OBDII code, checking the pressure sensor and its wiring for any visible damage or wear, and testing the sensor's voltage and resistance.
4. What are the possible repair options for resolving the P1146 code in a Subaru?
- Repair options include replacing the faulty pressure sensor, repairing any damaged wiring, fixing vacuum leaks, or reprogramming the ECM if necessary.
5. Is it safe to continue driving my Subaru with the P1146 code illuminated?
- While driving with the P1146 code illuminated may be possible, it is recommended to address the issue promptly to prevent potential damage to the engine and ensure optimal vehicle performance.
6. Can I reset the P1146 code in my Subaru using an OBDII scanner?
- Yes, you can reset the P1146 code using an OBDII scanner, but it is important to diagnose and address the underlying issue to prevent the code from reoccurring.
7. How much does it typically cost to repair the Pressure Sensor Circuit Range/Performance Problem High Input in a Subaru?
- Repair costs can vary depending on the exact cause of the issue, but replacing a faulty pressure sensor or repairing wiring issues may cost a few hundred dollars at a repair shop.
8. Are there any preventive maintenance tips to avoid the P1146 code in my Subaru?
- To prevent the P1146 code, it is advisable to perform regular maintenance checks, such as inspecting the pressure sensor and its wiring, and addressing any issues promptly.
9. Can extreme weather conditions affect the Pressure Sensor Circuit Range/Performance Problem High Input in a Subaru?
- Yes, extreme weather conditions can potentially affect the pressure sensor's performance, leading to the triggering of the P1146 code in a Subaru.
10. Will the P1146 code in a Subaru cause permanent damage if left unresolved?
- Leaving the P1146 code unresolved may result in decreased engine performance and fuel efficiency over time, potentially leading to more severe issues if not addressed promptly.
Discuss the causes and fixes for P1146 Subaru OBDII Code
Code P1146 Subaru comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.