The P3459: Cylinder 8 Deactivation/Intake Valve Control Circuit Low refers to a low voltage condition in the intake valve control circuit for Cylinder 8. This could be caused by faulty wiring, poor electrical connections, or a malfunctioning control solenoid. The intake valve control system manages the flow of air into Cylinder 8, and low voltage can prevent the valve from functioning properly, leading to engine performance issues.
P3459 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P3459: Cylinder 8 Deactivation/Intake Valve Control Circuit Low |
| Is it serious? | Yes, this can result in engine misfires, poor idling, and reduced fuel efficiency. |
| Possible causes | – Low voltage in the intake valve control circuit for Cylinder 8 – Faulty wiring or connections – Malfunctioning control solenoid |
| How to diagnose? | – Check the voltage levels in the intake valve control circuit for Cylinder 8 – Inspect wiring and connections for faults – Test the control solenoid for proper operation |
P3459 Meaning
The P3459: Cylinder 8 Deactivation/Intake Valve Control Circuit Low code indicates that the voltage in the intake valve control circuit for Cylinder 8 is lower than expected. This can be caused by damaged wiring, poor electrical connections, or a malfunctioning intake valve control solenoid. Low voltage prevents the intake valve from functioning correctly, leading to poor engine performance such as misfires and rough idling.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for additional related codes that might provide more insights into the Cylinder 8 intake valve control system. | OBD-II Scanner |
| Check Voltage Levels | Use a multimeter to measure the voltage levels in the intake valve control circuit for Cylinder 8. Compare the readings with manufacturer specifications to confirm low voltage. | Multimeter, Diagnostic Tool |
| Inspect Wiring and Connections | Visually inspect the wiring and connections in the intake valve control circuit for Cylinder 8. Look for signs of damage, corrosion, or loose connections. Repair or replace as necessary. | Flashlight, Multimeter |
| Test Control Solenoid | Test the intake valve control solenoid for Cylinder 8 to ensure it is functioning correctly. Measure its resistance and check against manufacturer specifications. Replace if necessary. | Multimeter, Mechanic Tools |
| Repair or Replace Faulty Components | Repair or replace any faulty wiring, connectors, or solenoids identified during diagnostics. Ensure proper installation and re-test the system after replacement. | Mechanic Tools |
| Clear the Code and Test Drive | After completing repairs, clear the fault code using an OBD-II scanner. Take the vehicle for a test drive to ensure the intake valve control system for Cylinder 8 is functioning correctly. | OBD-II Scanner, Vehicle |
| Recheck for Codes | After the test drive, re-scan the vehicle to ensure the P3459 code does not return. If the code reappears, further diagnostics may be required. | OBD-II Scanner |
Free PDF: How to choose OBD2 scanner
I’ve made you a free PDF to choose the OBD2 scanner in 5 minutes.
✅ Which OBD2 scanner is best?
✅ Which type should you get (DIY, Pro, Hobby)
✅ What is the best scanner for the exact brand/feature (e.g best for BMW)
✅ How to get a Bi-Directional tool for as cheap as $40
✅ Discount coupons for scanners
PDF is 100% free and it is designed to help you pick a scanner in less than a few minutes! Not a boring 50-page guide.
Just tell me where to send it.
