BMW DTC P0459 – EVAP System Purge Control Valve ‘A’ Circuit High
DTC P0459 meaning on BMW
The Diagnostic Trouble Code (DTC) P0459 for BMW indicates a malfunction in the Evaporative Emission Control System Purge Control Valve ‘A’ Circuit. This code is triggered when the Engine Control Module (ECM) detects a high voltage condition in the circuit that controls the purge valve.
BMW DTC P0459 symptoms
Symptoms of DTC P0459 on a BMW may include:
- Check Engine Light illuminated on the dashboard
- Decreased fuel efficiency
- Strong fuel odor near the vehicle
- Problems with starting the engine
BMW DTC P0459 causes
The common causes of DTC P0459 on a BMW include:
- Faulty Evaporative Emission Control System Purge Control Valve
- Wiring or connector issues in the purge valve circuit
- ECM software or hardware problems
BMW DTC P0459 seriousness
While DTC P0459 may not cause immediate drivability issues, it is important to address this problem promptly. Ignoring this code can lead to increased emissions, reduced fuel efficiency, and potential damage to other emission control components.
How to diagnose DTC P0459 on BMW
To diagnose DTC P0459 on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scan tool to retrieve the fault codes
- Inspect the wiring and connectors related to the purge control valve
- Test the purge control valve for proper operation
- Check the ECM for any software or hardware issues
How to fix DTC P0459 on BMW
To fix DTC P0459 on a BMW, the following steps may be taken:
- Replace the faulty Evaporative Emission Control System Purge Control Valve
- Repair or replace any damaged wiring or connectors in the circuit
- Clear the fault codes and reset the ECM
- Perform a test drive to ensure the issue has been resolved
How to erase DTC P0459 on BMW
To erase DTC P0459 on a BMW, the fault codes can be cleared using a diagnostic scan tool. After the repair has been completed and the issue resolved, the mechanic can reset the ECM to clear the code. It is important to ensure that the underlying issue causing the fault code has been addressed before clearing the code.
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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