P146D Code - EVAP Purge System Pressure Sensor Circuit Low Voltage
Quick Answer
The EVAP Purge System Pressure Sensor is a 3-wire piezo-resistive pressure transducer integrated into the Evaporative Emission Purge Pump. Common causes include Faulty Evaporative Emission Purge Pump, Evaporative Emission Purge Pump harness is open or shorted, Evaporative Emission Purge Pump circuit poor electrical connection. 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 Evaporative Emission Purge Pump, Evaporative Emission Purge Pump harness is open or shorted, Evaporative Emission Purge Pump circuit poor electrical connection.
- 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.
Code P146D Description
What are the Possible Causes of the DTC P146D?
- Faulty Evaporative Emission Purge Pump
- Evaporative Emission Purge Pump harness is open or shorted
- Evaporative Emission Purge Pump circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P146D?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P146D code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P146D code?
Need more information on how to fix the P146D code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P146D code diagnosed by a professional: Find a repair shop in your area
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
-
-
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.
-
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
