AutoCodes – GMC – P146A 2019 GMC Sierra

P146A 2019 GMC Sierra Code - EVAP Purge Pump Speed Too High

Quick Answer

Purge capacity is being reduced by technologies that improve fuel economy. 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: P146A 2019 GMC Sierra indicates EVAP Purge Pump Speed Too High.
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 257

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 18, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P146A 2019 GMC Sierra Description

Purge capacity is being reduced by technologies that improve fuel economy. The Evaporative Emission Purge Pump is used to purge stored vapors from the Evaporative Emission Canister and is required to increase the purge volumes to meet LEV 3 Evaporative Emission requirements. The Evaporative Emission Purge Pump has an integral pressure sensor for controlling purge vapors from the canister. The Engine Control Module (ECM) monitors the Evaporative Emission Purge Pump, and the Diagnostic Trouble Code (DTC) will be set when the EVAP Purge Pump Speed is greater than 55,000 RPM for greater than 5 s.

OBDII Code P146A 2019 GMC Sierra - EVAP Purge Pump Speed Too High - AutoCodes.com — P146A 2019 GMC Sierra Code - EVAP Purge Pump Speed Too High

What does this mean?

What are the Possible Causes of the DTC P146A 2019 GMC Sierra?

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 P146A 2019 GMC Sierra?

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 P146A 2019 GMC Sierra 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 P146A 2019 GMC Sierra code?

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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 P146A 2019 GMC Sierra Code

1. What are the common symptoms of OBDII code P146A in a 2019 GMC Sierra related to the EVAP Purge Pump Speed being too high?

The common symptoms include the check engine light illuminating, reduced fuel efficiency, and potential rough idle or stalling.

2. What are the possible causes of OBDII code P146A in a 2019 GMC Sierra?

Possible causes of this code include a malfunctioning EVAP purge valve, a faulty EVAP canister, a vacuum leak in the EVAP system, or issues with the EVAP purge pump.

3. How can I diagnose the OBDII code P146A in a 2019 GMC Sierra?

Diagnosing this code usually involves using an OBDII scanner to read the code, inspecting the EVAP system components for any visible damage or leaks, and testing the EVAP purge pump speed with diagnostic tools.

4. Is it safe to continue driving a 2019 GMC Sierra with OBDII code P146A triggered?

It is generally not recommended to drive with this code active, as it can lead to further damage to the EVAP system and potentially affect the vehicle's performance.

5. What are some repair tips for addressing OBDII code P146A in a 2019 GMC Sierra?

Repair tips may include checking and replacing the EVAP purge pump, inspecting and repairing any damaged hoses or connections in the EVAP system, and clearing the code with an OBDII scanner after repairs are completed.

6. Can a DIY enthusiast fix OBDII code P146A in a 2019 GMC Sierra?

While some basic troubleshooting and repairs can be done by DIY enthusiasts, diagnosing and repairing issues related to the EVAP system may require specialized tools and knowledge, so it's recommended to consult a professional mechanic.

7. How much does it typically cost to repair OBDII code P146A in a 2019 GMC Sierra?

The cost of repairing this code can vary depending on the specific cause of the issue, but it may range from $100 to $500 or more, including parts and labor.

8. Will resetting the check engine light temporarily resolve OBDII code P146A in a 2019 GMC Sierra?

Resetting the check engine light may temporarily turn it off, but if the underlying issue causing the code is not addressed, the light is likely to come back on once the problem is detected again.

9. Can extreme weather conditions trigger OBDII code P146A in a 2019 GMC Sierra?

Extreme weather conditions can potentially exacerbate issues with the EVAP system, leading to the triggering of this code. It's important to ensure all components are properly sealed and functioning correctly.

10. How often should the EVAP system be inspected in a 2019 GMC Sierra to prevent OBDII code P146A?

Regular maintenance checks, such as during scheduled services or when experiencing symptoms like fuel efficiency loss, should include an inspection of the EVAP system to help prevent issues that could trigger this code.