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P1468 2019 GMC Sierra Code - EVAP Purge Pump Overspeed

Quick Answer

The P1468 code in a 2019 GMC Sierra indicates a problem with the EVAP (Evaporative Emission Control System) purge pump overspeed. Common causes include Faulty Purge Pump: A malfunctioning or failing EVAP purge pump can cause it to operate at an overspeed, Wiring Issues: Damaged or corroded wiring connections to the purge pump can disrupt its operation, Vacuum Leaks: Any leaks in the EVAP system can cause the purge pump to work harder than necessary. 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
P1468 2019 GMC Sierra indicates EVAP Purge Pump Overspeed.
Common causes
Common causes include Faulty Purge Pump: A malfunctioning or failing EVAP purge pump can cause it to operate at an overspeed, Wiring Issues: Damaged or corroded wiring connections to the purge pump can disrupt its operation, Vacuum Leaks: Any leaks in the EVAP system can cause the purge pump to work harder than necessary.
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 12, 2024
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Code P1468 2019 GMC Sierra Description

The P1468 code in a 2019 GMC Sierra indicates a problem with the EVAP (Evaporative Emission Control System) purge pump overspeed. The EVAP system is crucial for controlling the release of fuel vapors from the fuel tank, ensuring they are captured and burned in the engine, rather than being released into the atmosphere. The purge pump is responsible for regulating the flow of fuel vapors from the charcoal canister to the engine intake manifold for combustion.

OBDII Code P1468 2019 GMC Sierra - EVAP Purge Pump Overspeed
P1468 2019 GMC Sierra Code - EVAP Purge Pump Overspeed

Common Causes of P1468 2019 GMC Sierra

  1. Faulty Purge Pump: A malfunctioning or failing EVAP purge pump can cause it to operate at an overspeed.
  2. Wiring Issues: Damaged or corroded wiring connections to the purge pump can disrupt its operation.
  3. Vacuum Leaks: Any leaks in the EVAP system can cause the purge pump to work harder than necessary.
  4. EVAP System Blockage: Blockages in the EVAP system can lead to an overspeeding purge pump.
  5. Software or Computer Issues: Problems with the vehicle's computer or software that controls the purge pump can also trigger this code.

Symptoms of P1468 2019 GMC Sierra

  1. Check Engine Light: The most common symptom associated with the P1468 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Rough Idle: An overspeeding purge pump can cause the engine to idle roughly or inconsistently.
  3. Decreased Fuel Efficiency: The vehicle may experience a decrease in fuel efficiency due to the improper combustion of fuel vapors.
  4. Strong Fuel Smell: Excessive fuel vapors being sent to the engine can result in a strong fuel smell both inside and outside the vehicle.
  5. Failed Emissions Test: If the issue is not addressed, it may lead to the vehicle failing an emissions test due to increased emissions.

How to Fix P1468 2019 GMC Sierra

  1. Diagnose the Issue: Use an OBD-II scanner to read the code and pinpoint the specific problem with the EVAP purge pump overspeed.
  2. Inspect Purge Pump: Check the purge pump for any signs of damage or malfunction and replace if necessary.
  3. Check Wiring: Inspect the wiring connections to the purge pump for any damage or corrosion and repair as needed.
  4. Clear Blockages: Ensure that the EVAP system is free of any blockages that could be causing the overspeeding issue.
  5. Reset the Code: After completing the repairs, clear the code using the OBD-II scanner to reset the check engine light.

Cost to Fix P1468 2019 GMC Sierra

The typical repair costs for addressing the P1468 code in a 2019 GMC Sierra can vary depending on the specific cause of the issue. On average, the cost of replacing a faulty purge pump can range from $150 to $300, while addressing wiring issues or blockages may cost around $100 to $200. Labor costs can add an additional $80 to $150 per hour, and the total repair bill can amount to $300 to $600 or more. It's important to note that these estimates are approximate, and actual costs may vary based on the vehicle's make and model, location, and the specific repair shop rates. It is recommended to consult with a professional mechanic for a more accurate cost estimate.

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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 P1468 2019 GMC Sierra Code

1. What does the OBDII code P1468 mean on a 2019 GMC Sierra?

P1468 indicates an "EVAP Purge Pump Overspeed" issue, meaning the purge pump in the evaporative emissions system is operating faster than expected.

2. What are the symptoms of P1468 on a 2019 GMC Sierra?

Common symptoms include an illuminated check engine light, possible fuel odor, and reduced fuel efficiency. In some cases, there may be no noticeable symptoms.

3. What causes the P1468 code on a GMC Sierra?

Possible causes include a faulty EVAP purge pump, a damaged or restricted purge line, a failing EVAP pressure sensor, or electrical issues like a bad connection or wiring fault in the purge pump circuit.

4. How serious is the P1468 code?

While not an immediate safety concern, the code can lead to increased emissions and potentially cause issues during an emissions inspection. It should be addressed promptly to avoid further damage.

5. Can I drive my 2019 GMC Sierra with the P1468 code?

Yes, the vehicle is generally safe to drive, but prolonged driving with this issue may lead to worsened fuel efficiency and emissions problems.

6. How is the P1468 code diagnosed?

A mechanic will typically use a scan tool to confirm the code, inspect the EVAP system components, check for vacuum leaks or blockages, and test the purge pump and related wiring.

7. How can I fix the P1468 code?

Repairs may involve replacing the EVAP purge pump, clearing blockages in the purge lines, fixing wiring issues, or replacing a faulty EVAP pressure sensor.

8. What tools are needed to fix the P1468 code?

Tools like an OBDII scanner, a multimeter for electrical tests, and vacuum line testing equipment may be necessary for diagnosing and repairing this code.

9. How much does it cost to fix the P1468 code on a GMC Sierra?

Repair costs can range from $100 to $400, depending on whether the issue involves replacing the purge pump, fixing wiring, or addressing other components.

10. Can I fix the P1468 code on my own?

If you have the tools and experience, you can inspect the EVAP system for blockages or damaged components. However, more complex repairs like pump replacement or wiring fixes may require professional help.

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