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

Quick Answer

The P146A diagnostic trouble code (DTC) for a 2019 GMC Sierra relates to the EVAP (Evaporative Emission Control System) Purge Pump operating at a speed that is considered too high. Common causes include Malfunctioning EVAP purge pump, Faulty EVAP purge valve, Vacuum leak in the EVAP system. 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 Malfunctioning EVAP purge pump, Faulty EVAP purge valve, Vacuum leak in the EVAP system.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P146A 2019 GMC Sierra Description

The P146A diagnostic trouble code (DTC) for a 2019 GMC Sierra relates to the EVAP (Evaporative Emission Control System) Purge Pump operating at a speed that is considered too high. The EVAP system is responsible for capturing and storing fuel vapors from the fuel tank to prevent them from being released into the atmosphere. The purge pump helps to control the flow of vapors from the charcoal canister to the engine intake manifold for combustion.

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

Common Causes of P146A 2019 GMC Sierra

  1. Malfunctioning EVAP purge pump
  2. Faulty EVAP purge valve
  3. Vacuum leak in the EVAP system
  4. Wiring issue or electrical problem
  5. Clogged EVAP system components

Symptoms of P146A 2019 GMC Sierra

  1. Check engine light illuminated
  2. Decreased fuel efficiency
  3. Rough idling or stalling
  4. Hesitation during acceleration
  5. Strong fuel odor from the vehicle

How to Fix P146A 2019 GMC Sierra

  1. Diagnostic: Use a scan tool to retrieve the DTC and perform a thorough inspection of the EVAP system components to identify the root cause of the issue.
  2. Replace EVAP Purge Pump: If the purge pump is determined to be faulty, replace it with a new OEM or high-quality aftermarket component.
  3. Check EVAP Purge Valve: Inspect the purge valve for proper operation and replace it if necessary.
  4. Repair Vacuum Leak: Locate and repair any vacuum leaks in the EVAP system using a smoke machine or a handheld vacuum pump.
  5. Clear DTC: After completing the repairs, clear the DTC using a scan tool and perform a test drive to ensure the issue has been resolved.

Cost to Fix P146A 2019 GMC Sierra

The typical repair costs for addressing a P146A code on a 2019 GMC Sierra can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay between $200 and $500 for parts and labor. Keep in mind that the diagnosis time and labor rates at auto repair shops can fluctuate, with hourly rates typically ranging from $80 to $150. It's recommended to obtain quotes from local shops to get a more accurate estimate for your specific situation.

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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.

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