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Engine-Codes – GMC – P3460 GMC

P3460 GMC Code - Cylinder 8 Deactivation/Intake Valve Control Circuit High

Quick Answer

The P3460 diagnostic trouble code (DTC) for GMC vehicles indicates an issue with the cylinder 8 deactivation/intake valve control circuit being too high. Common causes include Faulty cylinder deactivation solenoid, Wiring issues in the intake valve control circuit, Low oil pressure or contaminated oil. 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
P3460 GMC indicates Cylinder 8 Deactivation/Intake Valve Control Circuit High.
Common causes
Common causes include Faulty cylinder deactivation solenoid, Wiring issues in the intake valve control circuit, Low oil pressure or contaminated oil.
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 09, 2024
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Code P3460 GMC Description

The P3460 diagnostic trouble code (DTC) for GMC vehicles indicates an issue with the cylinder 8 deactivation/intake valve control circuit being too high. This code typically points to a problem with the cylinder deactivation system, which is designed to improve fuel efficiency by shutting off specific cylinders when they are not needed. In this case, cylinder 8 is not deactivating properly, which can lead to decreased fuel economy, reduced engine performance, and potential long-term damage if not addressed promptly.

OBDII Code P3460 GMC - Cylinder 8 Deactivation/Intake Valve Control Circuit High
P3460 GMC Code - Cylinder 8 Deactivation/Intake Valve Control Circuit High

Common Causes of P3460 GMC

  1. Faulty cylinder deactivation solenoid
  2. Wiring issues in the intake valve control circuit
  3. Low oil pressure or contaminated oil
  4. Faulty engine control module (ECM)
  5. Mechanical issues with the intake valve for cylinder 8

Symptoms of P3460 GMC

  1. Decreased fuel economy
  2. Rough idling or misfiring
  3. Engine hesitation or loss of power
  4. Illumination of the check engine light
  5. Engine overheating in severe cases

How to Fix P3460 GMC

  1. Diagnose the issue by using a scan tool to read the code and check the intake valve control circuit for cylinder 8.
  2. Inspect the wiring harness and connectors for any signs of damage or corrosion.
  3. Test the cylinder deactivation solenoid for proper operation and replace if necessary.
  4. Check the oil level and quality, ensuring that it meets the manufacturer's specifications.
  5. If all else fails, consider replacing the intake valve for cylinder 8 if it is found to be faulty.

Cost to Fix P3460 GMC

The cost of repairing a P3460 DTC for GMC vehicles can vary depending on the specific cause of the issue. On average, the cost of parts for this repair can range from $100 to $300, with labor costs adding an additional $100 to $200. Overall, the total repair cost for this issue may fall in the range of $200 to $500. However, it's important to note that these estimates are rough approximations, and actual costs may vary based on factors such as location, vehicle make and model, and the specific repair shop chosen. It's recommended to obtain quotes from multiple repair shops to get a more accurate estimate for this repair.

When is the Code Detected?

The control module detects that the actual measured values from the MAF sensor, MAP sensor, and TP sensor, is not within the range of the calculated values for cylinder deactivation mode

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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 P3460 GMC Code

1. What are the common symptoms of OBDII code P3460 GMC?

The common symptoms of code P3460 GMC include rough idling, decreased fuel efficiency, engine misfires, and illuminated Check Engine light.

2. What does the OBDII code P3460 GMC indicate?

OBDII code P3460 GMC indicates an issue with the Cylinder 8 Deactivation/Intake Valve Control Circuit being too high.

3. What are the possible causes of OBDII code P3460 GMC?

The possible causes of code P3460 GMC can include a faulty solenoid, damaged wiring or connectors, low oil pressure, or issues with the oil control valve.

4. How can I diagnose the Cylinder 8 Deactivation/Intake Valve Control Circuit high issue?

To diagnose the issue, you can use an OBDII scanner to read the code, inspect the wiring and connectors for any damage, and test the solenoid and oil control valve for proper functioning.

5. Can I continue to drive my vehicle with OBDII code P3460 GMC?

It is not recommended to continue driving your vehicle with code P3460 GMC as it can lead to further damage to the engine components. It is best to address the issue promptly.

6. How can I repair OBDII code P3460 GMC?

Repairing code P3460 GMC may involve replacing the faulty solenoid, repairing damaged wiring or connectors, checking and adjusting oil pressure, or replacing the oil control valve as needed.

7. Will resetting the trouble codes make OBDII code P3460 GMC disappear?

Resetting the trouble codes may temporarily clear the Check Engine light, but if the underlying issue causing code P3460 GMC is not addressed, the light is likely to come back on.

8. How much does it cost to fix OBDII code P3460 GMC?

The cost to fix code P3460 GMC can vary depending on the specific cause of the issue, the labor rates in your area, and whether any parts need to be replaced. It is recommended to get a diagnostic from a qualified mechanic for an accurate estimate.

9. Can a DIY enthusiast fix OBDII code P3460 GMC?

While some DIY enthusiasts may be able to diagnose and repair code P3460 GMC themselves, it is recommended to have the issue addressed by a professional mechanic to ensure proper diagnosis and repair.

10. How can I prevent OBDII code P3460 GMC from occurring in the future?

To prevent code P3460 GMC from occurring in the future, it is important to follow the manufacturer's recommended maintenance schedule, regularly check oil levels and pressure, and address any engine issues promptly.

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