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Engine-Codes – GMC – P1468 GMC

P1468 GMC Code - EVAP Purge Pump Overspeed

Quick Answer

The P1468 GMC code refers to an issue with the EVAP purge pump overspeed. Common causes include Faulty Purge Pump: A malfunctioning EVAP purge pump can lead to an overspeed condition and trigger the P1468 code, Blocked EVAP System: Blockages in the EVAP lines or charcoal canister can restrict the flow of fuel vapor, causing the purge pump to run at a higher speed, Defective Purge Valve: A faulty purge valve can disrupt the proper functioning of the EVAP system, leading to an overspeed condition. 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 GMC indicates EVAP Purge Pump Overspeed.
Common causes
Common causes include Faulty Purge Pump: A malfunctioning EVAP purge pump can lead to an overspeed condition and trigger the P1468 code, Blocked EVAP System: Blockages in the EVAP lines or charcoal canister can restrict the flow of fuel vapor, causing the purge pump to run at a higher speed, Defective Purge Valve: A faulty purge valve can disrupt the proper functioning of the EVAP system, leading to an overspeed condition.
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 10, 2024
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Code P1468 GMC Description

The P1468 GMC code refers to an issue with the EVAP purge pump overspeed. The EVAP (Evaporative Emission Control System) purge pump is responsible for controlling the flow of fuel vapor from the charcoal canister to the engine intake. When the purge pump operates at an excessive speed, it can lead to various problems in the vehicle's emission control system.

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

Common Causes of P1468 GMC

  1. Faulty Purge Pump: A malfunctioning EVAP purge pump can lead to an overspeed condition and trigger the P1468 code.
  2. Blocked EVAP System: Blockages in the EVAP lines or charcoal canister can restrict the flow of fuel vapor, causing the purge pump to run at a higher speed.
  3. Defective Purge Valve: A faulty purge valve can disrupt the proper functioning of the EVAP system, leading to an overspeed condition.
  4. Wiring Issues: Electrical problems such as damaged wiring or faulty connectors can also cause the EVAP purge pump to operate at an excessive speed.

Symptoms of P1468 GMC

  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. Decreased Fuel Efficiency: An overspeeding EVAP purge pump can result in poor fuel economy due to inefficient vapor control.
  3. Rough Idle: The engine may experience rough idling or fluctuations in RPMs as a result of the EVAP purge pump overspeed condition.
  4. Strong Fuel Odor: A strong smell of fuel inside or outside the vehicle may indicate a problem with the EVAP system, potentially linked to the P1468 code.

How to Fix P1468 GMC

  1. Diagnose the Issue: Use an OBD-II scanner to retrieve the trouble code and perform a thorough inspection of the EVAP system to identify the root cause of the problem.
  2. Replace Purge Pump: If the purge pump is found to be faulty, replace it with a new one following the manufacturer's guidelines.
  3. Clear Codes: Clear the trouble codes from the vehicle's computer using the OBD-II scanner after completing the repair to reset the system.
  4. Perform Smoke Test: Conduct a smoke test to check for leaks in the EVAP system and ensure proper sealing and functionality.
  5. Test Drive: Take the vehicle for a test drive to verify that the issue has been resolved and the check engine light does not reappear.

Cost to Fix P1468 GMC

The typical repair costs for addressing the P1468 GMC code can range from $150 to $400, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary depending on factors such as location, vehicle make and model, and engine type. It is advisable to inquire about local rates for a more accurate estimate before proceeding with the repair.

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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 P1468 GMC Code

1. What are the common symptoms of OBDII code P1468 GMC (EVAP Purge Pump Overspeed)?

- Common symptoms include rough idling, stalling, decreased fuel efficiency, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P1468 GMC?

- The code may be triggered by a faulty EVAP purge solenoid, a clogged EVAP canister, a vacuum leak in the EVAP system, or a malfunctioning engine control module (ECM).

3. How can I diagnose OBDII code P1468 GMC?

- Diagnosis typically involves using an OBDII scanner to retrieve the code, followed by inspecting the EVAP system components for any visible damage or leaks.

4. Can a DIY enthusiast repair OBDII code P1468 GMC?

- Depending on the cause, DIY repairs may include replacing the EVAP purge solenoid, clearing obstructions in the EVAP canister, or fixing vacuum leaks. However, professional assistance may be required for more complex issues.

5. How urgent is it to address OBDII code P1468 GMC?

- While the vehicle may still be operable with this code, it is important to address it promptly to prevent potential damage to the engine and ensure optimal fuel efficiency.

6. What are some tips for preventing OBDII code P1468 GMC from reoccurring?

- Regularly inspecting and maintaining the EVAP system, ensuring proper gas cap sealing, and promptly addressing any check engine light warnings can help prevent the code from reoccurring.

7. Can OBDII code P1468 GMC cause other issues with the vehicle?

- If left unresolved, this code can lead to increased emissions, decreased engine performance, and potential damage to the catalytic converter over time.

8. Is it safe to continue driving with OBDII code P1468 GMC?

- While it may be safe to drive in the short term, it is recommended to address the issue as soon as possible to prevent any further complications or damage to the vehicle.

9. How long does it typically take to repair OBDII code P1468 GMC?

- The repair time can vary depending on the exact cause of the code and the complexity of the repair needed. It can range from a quick fix to a more involved repair requiring professional assistance.

10. Can extreme weather conditions affect the triggering of OBDII code P1468 GMC?

- Extreme weather conditions, such as extreme heat or cold, can potentially exacerbate issues within the EVAP system and contribute to the triggering of this code. Regular maintenance can help mitigate these effects.

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