Engine-Codes.com
Engine-Codes – GMC – P3459 GMC

P3459 GMC Code - Cylinder 8 Deactivation/Intake Valve Control Circuit Low

Quick Answer

The P3459 GMC diagnostic trouble code indicates an issue with the Cylinder 8 Deactivation/Intake Valve Control Circuit being detected as low. Common causes include Faulty intake valve control solenoid, Wiring issues in the intake valve control circuit, Failed intake valve position sensor. 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
P3459 GMC indicates Cylinder 8 Deactivation/Intake Valve Control Circuit Low.
Common causes
Common causes include Faulty intake valve control solenoid, Wiring issues in the intake valve control circuit, Failed intake valve position sensor.
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
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P3459 GMC Description

The P3459 GMC diagnostic trouble code indicates an issue with the Cylinder 8 Deactivation/Intake Valve Control Circuit being detected as low. In modern vehicles, cylinder deactivation technology is used to improve fuel efficiency by shutting down select cylinders when they are not needed, such as during light load conditions. This code specifically refers to the intake valve control circuit for cylinder 8, signaling that there is a problem with the electrical signals or components involved in deactivating this cylinder.

OBDII Code P3459 GMC - Cylinder 8 Deactivation/Intake Valve Control Circuit Low
P3459 GMC Code - Cylinder 8 Deactivation/Intake Valve Control Circuit Low

Common Causes of P3459 GMC

  1. Faulty intake valve control solenoid
  2. Wiring issues in the intake valve control circuit
  3. Failed intake valve position sensor
  4. ECM malfunction
  5. Mechanical problem with cylinder 8

Symptoms of P3459 GMC

  1. Engine misfires
  2. Reduced engine power
  3. Poor fuel efficiency
  4. Illuminated check engine light
  5. Rough idling

How to Fix P3459 GMC

  1. Begin by using a diagnostic scanner to verify the P3459 code and isolate the issue to cylinder 8.
  2. Inspect the intake valve control solenoid, wiring, and connector for any visible damage or corrosion. Replace any faulty components.
  3. Test the intake valve position sensor for proper operation and replace if necessary.
  4. Check the ECM for any stored codes or malfunctions related to the intake valve control circuit. Reset or reprogram the ECM as needed.
  5. Perform a test drive to ensure the issue is resolved and the code does not reappear.

Cost to Fix P3459 GMC

The typical repair costs for addressing a P3459 GMC code can vary depending on the specific cause of the issue. In general, parts such as intake valve control solenoids or sensors may range from $50 to $200, while labor costs can add an additional $100 to $300. Overall, the total repair cost for this issue could range from $150 to $500. It is important to note that these estimates are rough averages and actual costs may vary based on factors such as location, vehicle make and model, and the extent of the repairs needed. It is recommended to consult with a trusted mechanic or auto repair shop for a more accurate cost estimate.

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

Need more information about the P3459 GMC code?

Need more information on how to fix the P3459 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P3459 GMC code diagnosed by a professional: Find a repair shop in your area

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 P3459 GMC Code

1. What are the common symptoms of OBDII code P3459 GMC?

The common symptoms of code P3459 include rough idling, reduced engine performance, and possible stalling of the vehicle.

2. What does the OBDII code P3459 GMC indicate?

Code P3459 indicates an issue with the Cylinder 8 deactivation/intake valve control circuit being detected as low, meaning there may be a problem with the electrical circuit.

3. What are the possible causes of OBDII code P3459 GMC?

Possible causes of code P3459 include a faulty intake valve control solenoid, wiring issues in the circuit, low engine oil pressure, or a malfunctioning engine control module (ECM).

4. How can I diagnose the cause of OBDII code P3459 GMC?

Diagnosing code P3459 may involve checking the intake valve control solenoid, inspecting the wiring for damage or loose connections, and testing the oil pressure to ensure it meets manufacturer specifications.

5. Can I continue driving with OBDII code P3459 GMC?

It is not recommended to continue driving with code P3459 present, as it can lead to further engine damage or poor performance. It is best to address the issue promptly.

6. How can I clear OBDII code P3459 GMC from my vehicle's computer?

You can clear the code using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes. However, the underlying issue causing the code should still be addressed.

7. Is it possible to repair OBDII code P3459 GMC myself?

Depending on your mechanical skills, you may be able to repair code P3459 yourself by replacing the intake valve control solenoid or addressing any wiring issues. However, professional diagnosis is recommended.

8. How much does it cost to repair OBDII code P3459 GMC?

The cost of repairing code P3459 can vary depending on the cause of the issue, labor rates in your area, and the specific parts needed. It is advisable to obtain estimates from a trusted mechanic.

9. Will OBDII code P3459 GMC cause my vehicle to fail an emissions test?

If code P3459 is present during an emissions test, it may cause your vehicle to fail. It is important to address the issue and clear the code before attempting another emissions test.

10. How can I prevent OBDII code P3459 GMC from recurring in the future?

To prevent code P3459 from recurring, it is essential to perform regular maintenance on your vehicle, including checking engine oil levels, inspecting wiring for damage, and addressing any issues promptly.

Discuss the causes and fixes for P3459 GMC OBDII Code

Submit a New Comment

Code P3459 GMC comments

No comments found for this page.