AutoCodes – Buick – P146D Buick

P146D Buick 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 Buick 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.

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Code Popularity 2,666

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Sep 13, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P146D Buick Description

The EVAP Purge System Pressure Sensor is a 3-wire piezo-resistive pressure transducer integrated into the Evaporative Emission Purge Pump. It measures pressure within the pump, a critical component of the vehicle's emissions control system. This integration ensures precise pressure measurement for effective emission control, reducing harmful pollutants. The Diagnostic Trouble Code (DTC) will be set when the EVAP Purge Pump Pressure Sensor signal is less than 0.2 V for greater than 1 s.

OBDII Code P146D Buick - EVAP Purge System Pressure Sensor Circuit Low Voltage - AutoCodes.com — P146D Buick Code - EVAP Purge System Pressure Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P146D Buick?

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 Buick?

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 Buick 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.

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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.