BMW DTC P3459 – Cylinder 8 Deactivation/Intake Valve Control Circuit Low
DTC P3459 meaning on BMW
DTC P3459 on a BMW indicates an issue with the Cylinder 8 Deactivation/Intake Valve Control Circuit being detected as low. This means that there is a problem with the electrical circuit responsible for controlling the deactivation or activation of the intake valve in cylinder 8.
BMW DTC P3459 symptoms
Symptoms of DTC P3459 on a BMW may include engine misfires, rough idling, reduced engine performance, and potentially an illuminated check engine light on the dashboard.
BMW DTC P3459 causes
The causes of DTC P3459 on a BMW can vary, but common reasons include a faulty intake valve control solenoid, damaged wiring or connectors in the control circuit, or issues with the engine control module (ECM).
BMW DTC P3459 seriousness
While DTC P3459 may not cause immediate drivability issues, it can lead to reduced engine efficiency and potential long-term damage if left unresolved. It is recommended to address this issue promptly to prevent further complications.
How to diagnose DTC P3459 on BMW
To diagnose DTC P3459 on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault code and perform a thorough inspection of the intake valve control circuit, including checking the solenoid, wiring, and connectors for any signs of damage or malfunction.
Additionally, testing the intake valve control solenoid’s resistance and functionality, as well as checking the ECM for any related error codes, can help pinpoint the exact cause of the issue.
How to fix DTC P3459 on BMW
Fixing DTC P3459 on a BMW may involve replacing the faulty intake valve control solenoid, repairing or replacing damaged wiring or connectors in the control circuit, or addressing any issues with the ECM.
It is crucial to follow the manufacturer’s diagnostic and repair procedures to ensure the problem is properly resolved and prevent future occurrences of the fault code.
How to erase DTC P3459 on BMW
Once the underlying issue causing DTC P3459 on a BMW has been fixed, the fault code can be cleared using a diagnostic scanner. This will reset the check engine light and allow the vehicle’s ECM to monitor the system for any new faults.
It is important to verify that the repair was successful by driving the vehicle and ensuring that the code does not return before considering the issue fully resolved.
Recommended tools & DTC Scanners for BMW
Best Diagnostic App for modern BMWs: BimmerLink
Recommended Bluetooth adapter for Bimmerlink: OBDLink CX
Cable adapter for Bimmerlink: Enet Cable USB Type C
For older BMWs we recommend: Autel AutoLink AL319 (2024 version)
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
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