P146D Code - EVAP Purge System Pressure Sensor Circuit Low Voltage
Quick Answer
The P146D diagnostic trouble code (DTC) refers to an issue with the EVAP (Evaporative Emission Control) purge system pressure sensor circuit in a vehicle. Common causes include Faulty EVAP purge system pressure sensor, Damaged wiring or connectors in the sensor circuit, Malfunctioning PCM. 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
- P146D indicates EVAP Purge System Pressure Sensor Circuit Low Voltage.
- Common causes
- Common causes include Faulty EVAP purge system pressure sensor, Damaged wiring or connectors in the sensor circuit, Malfunctioning PCM.
- 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 P146D Description
The P146D diagnostic trouble code (DTC) refers to an issue with the EVAP (Evaporative Emission Control) purge system pressure sensor circuit in a vehicle. Specifically, it indicates that the voltage from the pressure sensor is lower than the expected range. The EVAP system is responsible for capturing and storing fuel vapors from the fuel tank to prevent them from escaping into the atmosphere. The purge system pressure sensor is a crucial component that monitors the pressure within the EVAP system.
Common Causes of P146D
- Faulty EVAP purge system pressure sensor.
- Damaged wiring or connectors in the sensor circuit.
- Malfunctioning PCM.
- Vacuum leak in the EVAP system.
- Clogged EVAP canister.
Symptoms of P146D
- Check engine light is illuminated on the dashboard.
- Decreased fuel efficiency.
- Rough idling or stalling.
- Increased emission levels.
- Vehicle failing emissions tests.
How to Fix P146D
- Begin by using an OBD-II scanner to diagnose the specific cause of the P146D code.
- Inspect the EVAP purge system pressure sensor and its wiring for any signs of damage or corrosion.
- Test the sensor's voltage output to determine if it is within the specified range.
- Replace the EVAP purge system pressure sensor if it is found to be faulty.
- Clear the DTC and reset the check engine light to ensure the issue has been resolved.
Cost to Fix P146D
The typical repair costs for addressing the P146D code can range from $150 to $400, depending on the specific cause of the issue and the cost of parts and labor. Additional costs may be incurred if other components of the EVAP system require attention. It is important to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on the vehicle's make and model, as well as the local labor rates.
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Code P146D Information for Specific Makes
- P146D Buick — EVAP Purge System Pressure Sensor Circuit Low Voltage
- P146D Cadillac — EVAP Purge System Pressure Sensor Circuit Low Voltage
- P146D Chevrolet — EVAP Purge System Pressure Sensor Circuit Low Voltage
- P146D GMC — EVAP Purge System Pressure Sensor Circuit Low Voltage
Frequently Asked Questions about P146D Code
1. What does the OBDII code P146D mean?
P146D indicates a low voltage issue in the EVAP Purge System Pressure Sensor Circuit, which monitors the pressure in the evaporative emissions system.
2. What are the symptoms of the P146D code?
Symptoms may include an illuminated check engine light, fuel odors near the vehicle, difficulty starting after refueling, and potential decreases in fuel efficiency.
3. What causes the P146D code to appear?
Common causes include a faulty EVAP pressure sensor, damaged or corroded wiring or connectors, a malfunctioning purge valve, or issues with the vehicle's PCM.
4. Can I drive with the P146D code?
While the vehicle may still be drivable, ignoring this code can lead to increased emissions, potential fuel system issues, and failed emissions testing.
5. How do I diagnose the P146D code?
Begin by inspecting the EVAP purge system for damaged wiring or loose connections, then test the EVAP pressure sensor and purge valve for proper function using a multimeter or scan tool.
6. Can the P146D code be caused by a loose gas cap?
While a loose gas cap can trigger some EVAP-related codes, it is less likely to cause the P146D code, which specifically pertains to the EVAP pressure sensor circuit.
7. How do I fix the P146D code?
Repairs may include replacing the EVAP pressure sensor, repairing damaged wiring or connectors, or replacing the EVAP purge valve if found faulty.
8. How much does it cost to fix the P146D code?
Repair costs can vary, but replacing an EVAP pressure sensor typically costs between $100 and $300, including parts and labor, depending on the vehicle model.
9. Can a bad PCM cause the P146D code?
Yes, although rare, a malfunctioning Powertrain Control Module (PCM) can misread or fail to regulate the EVAP pressure sensor circuit, triggering the code.
10. Will clearing the P146D code fix the issue?
Clearing the code will temporarily remove it, but the underlying problem must be fixed to prevent the code from returning.
Discuss the causes and fixes for P146D OBDII Code
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The diagnostic trouble code (DTC) P146D for your 2024 Chevrolet Trax indicates an issue with the EVAP (Evaporative Emission Control) Purge System Pressure Sensor Circuit, specifically detecting low voltage. This often points to a malfunctioning EVAP Purge Pump.
For the 2024 Chevrolet Trax, the EVAP Purge Pump part number is 25204641. This component is also referred to as the Vapor Canister Purge Pump.
It's important to note that General Motors has issued Technical Service Bulletin (TSB) 23-NA-214, which provides information on Purge Pump replacement and part number interchange for various models, including the 2024 Trax.
Given that this issue has been documented in service bulletins, it's advisable to contact your local Chevrolet dealership. They can confirm the appropriate part number and determine if your vehicle qualifies for any warranty repairs or recalls related to this component.
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