BMW DTC P0444 – EVAP System Purge Control Valve ‘A’ Circuit Open
DTC P0444 meaning on BMW
DTC P0444 indicates a fault in the EVAP (Evaporative Emission Control) system purge control valve circuit for BMW vehicles. The Engine Control Module (ECM) has detected an open circuit in the control circuit of the purge control valve ‘A’.
BMW DTC P0444 symptoms
Symptoms of DTC P0444 on a BMW may include:
- Check Engine Light (MIL) illuminated
- Decreased fuel efficiency
- Strong fuel odor near the vehicle
- Problems with starting the engine
BMW DTC P0444 causes
Common causes of DTC P0444 on BMW vehicles include:
- Faulty EVAP purge control valve
- Open or short circuit in the wiring harness
- Corrosion or poor connection in the electrical connectors
- Defective ECM
BMW DTC P0444 seriousness
While DTC P0444 may not cause immediate drivability issues, it can lead to increased emissions and decreased fuel efficiency. Ignoring this fault can also result in the vehicle failing an emissions test.
How to diagnose DTC P0444 on BMW
To diagnose DTC P0444 on a BMW, a mechanic can perform the following steps:
- Use a scan tool to retrieve the DTC and freeze frame data
- Inspect the EVAP purge control valve and its wiring for any visible damage
- Check the electrical connectors for corrosion or poor connections
- Perform a continuity test on the wiring harness
- If necessary, test the purge control valve for proper operation
How to fix DTC P0444 on BMW
To fix DTC P0444 on a BMW, the following steps can be taken:
- Replace the faulty EVAP purge control valve
- Repair any open or short circuits in the wiring harness
- Clean or replace any corroded electrical connectors
- If needed, replace the Engine Control Module (ECM)
How to erase DTC P0444 on BMW
After the issue causing DTC P0444 on a BMW has been resolved, the fault code can be erased using a scan tool. This will clear the code from the ECM’s memory and turn off the Check Engine Light.
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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