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P1467 GMC Code - EVAP Purge Pump Underspeed

Quick Answer

The P1467 GMC code indicates a problem with the EVAP purge pump underspeed. Common causes include Faulty Purge Pump: The purge pump itself may be malfunctioning or failing, causing it to run at an underspeed, Wiring Issues: Electrical problems such as damaged wiring or connectors can disrupt the communication between the purge pump and the vehicle's computer system, Vacuum Leaks: Any leaks in the vacuum lines or hoses connected to the EVAP system can result in reduced purge pump speed. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means
P1467 GMC indicates EVAP Purge Pump Underspeed.
Common causes
Common causes include Faulty Purge Pump: The purge pump itself may be malfunctioning or failing, causing it to run at an underspeed, Wiring Issues: Electrical problems such as damaged wiring or connectors can disrupt the communication between the purge pump and the vehicle's computer system, Vacuum Leaks: Any leaks in the vacuum lines or hoses connected to the EVAP system can result in reduced purge pump speed.
Severity
Low - monitor the vehicle and repair when practical.
Can I drive?
The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
What is this?
Table of contents Created and updated by William Orellana on Aug 19, 2024
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Code P1467 GMC Description

The P1467 GMC code indicates a problem with the EVAP purge pump underspeed. The EVAP (Evaporative Emission Control) system is responsible for capturing and storing fuel vapors from the fuel tank to prevent them from escaping into the atmosphere. The purge pump is a component of this system that helps regulate the flow of fuel vapors to the engine for combustion. When the purge pump is running at an underspeed, it may not be able to effectively perform its function, leading to potential emissions issues and decreased fuel efficiency.

OBDII Code P1467 GMC - EVAP Purge Pump Underspeed
P1467 GMC Code - EVAP Purge Pump Underspeed

Common Causes of P1467 GMC

  1. Faulty Purge Pump: The purge pump itself may be malfunctioning or failing, causing it to run at an underspeed.
  2. Wiring Issues: Electrical problems such as damaged wiring or connectors can disrupt the communication between the purge pump and the vehicle's computer system.
  3. Vacuum Leaks: Any leaks in the vacuum lines or hoses connected to the EVAP system can result in reduced purge pump speed.
  4. Clogged Charcoal Canister: A clogged charcoal canister can restrict the flow of fuel vapors, leading to the underspeed condition of the purge pump.
  5. Evaporative Emission Control System Leak: If there is a leak in the EVAP system, the purge pump may not be able to function properly.

Symptoms of P1467 GMC

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
  2. Decreased Fuel Efficiency: A malfunctioning purge pump can lead to increased fuel consumption as the engine may not be receiving the correct amount of fuel vapors for combustion.
  3. Rough Idle: The engine may experience rough idling or hesitation during acceleration due to improper fuel vapor flow.
  4. Failed Emissions Test: If the EVAP system is not working correctly, the vehicle may fail an emissions test due to increased emissions of fuel vapors.
  5. Gasoline Smell: A strong smell of gasoline inside or outside the vehicle may indicate a leak or issue with the EVAP system.

How to Fix P1467 GMC

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble code and inspect the EVAP system components for any visible damage or leaks.
  2. Test the Purge Pump: Test the purge pump's functionality using a multimeter to determine if it is running at the correct speed.
  3. Inspect Wiring and Connections: Check the wiring and connectors for any damage or corrosion, repairing or replacing as needed.
  4. Clean or Replace Charcoal Canister: If the charcoal canister is clogged, clean it out or replace it to restore proper flow of fuel vapors.
  5. Repair Vacuum Leaks: Inspect the vacuum lines and hoses for any leaks, repairing or replacing any damaged components to ensure proper operation of the EVAP system.

Cost to Fix P1467 GMC

The cost of repairing a P1467 GMC code related to an EVAP purge pump underspeed can vary depending on the specific cause of the issue and the labor rates of the auto repair shop. In general, the repair could range from $100 to $500, including parts and labor. It's important to note that the diagnosis time and labor rates at different auto repair shops can vary, so it's recommended to get a few quotes from local shops to determine the most cost-effective option.

What does this mean?

Tech Notes for P1467 GMC

Some 2019-2020 Chevrolet Silverado and GMC Sierra with 2.7L engine may have the Service Engine Soon (SES) Warning Light ON with Diagnostic Trouble Code (DTC) P1467 and/or P1469 set in the Engine Control Module (ECM). The cause is the Evaporative Emission Purge Pump may be filling with liquid fuel due to overfilling the fuel tank. There is a Factory Service Bulletin for this issue, the dealer will inspect the vehicle and replace the Evaporative Emission Purge Pump.

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Information for Specific GMC Models

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 P1467 GMC Code

1. What does the OBDII code P1467 mean on a GMC vehicle?

P1467 indicates that the EVAP purge pump is operating below the expected speed, suggesting a potential issue with the evaporative emissions control system.

2. What are the common symptoms of code P1467 on a GMC?

Symptoms may include an illuminated check engine light, reduced fuel efficiency, failed emissions tests, or a faint fuel smell near the vehicle.

3. What causes the P1467 code to appear on a GMC?

Common causes include a faulty EVAP purge pump, wiring or connector issues, a clogged EVAP system, or a malfunctioning powertrain control module (PCM).

4. Can I continue driving my GMC with the P1467 code active?

While driving may still be possible, ignoring the issue could lead to increased emissions, reduced performance, and potential damage to other components over time.

5. How can I diagnose the P1467 code on a GMC?

Start by inspecting the EVAP purge pump, its electrical connections, and wiring for damage. Use a scan tool to monitor pump performance and check for related codes.

6. How do I fix the P1467 code on my GMC?

Repairs may involve replacing the EVAP purge pump, cleaning or unclogging the EVAP system, repairing damaged wiring, or updating the PCM firmware if needed.

7. How much does it cost to repair a P1467 code on a GMC?

Repair costs can vary widely but typically range from $100 to $400, depending on whether the pump needs replacement or if the issue is wiring-related.

8. Can a loose gas cap cause the P1467 code on a GMC?

A loose or faulty gas cap is unlikely to trigger P1467 but can cause other EVAP-related codes. It’s still a good idea to check and ensure the gas cap is secure.

9. What tools are needed to diagnose and fix the P1467 code on a GMC?

Tools may include a diagnostic scan tool, a multimeter for testing electrical circuits, and possibly a smoke machine to check for EVAP system leaks.

10. Will clearing the P1467 code with a scan tool fix the issue on a GMC?

Clearing the code will turn off the check engine light temporarily, but if the underlying issue isn’t resolved, the code will likely return.

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