P0440 – BMW DTC

BMW DTC P0440 – EVAP System

DTC P0440 meaning on BMW

The Diagnostic Trouble Code (DTC) P0440 for BMW indicates an issue with the Evaporative Emission Control System. This code specifically points to a problem with the EVAP system’s purge control valve circuit.

BMW DTC P0440 symptoms

Symptoms of a DTC P0440 on a BMW may include:

• Check Engine Light illuminated on the dashboard
• Gasoline smell near the vehicle
• Decreased fuel efficiency

BMW DTC P0440 causes

Common causes of a DTC P0440 on a BMW include:

• Defective or stuck EVAP purge control valve
• EVAP system leaks
• Faulty EVAP canister
• Issues with the EVAP system hoses or connections

BMW DTC P0440 seriousness

While a DTC P0440 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 long-term damage to the vehicle’s emission control system.

How to diagnose DTC P0440 on BMW

To diagnose a DTC P0440 on a BMW, a mechanic may perform the following steps:

1. Use a diagnostic scanner to retrieve the trouble code
2. Inspect the EVAP system components for leaks or damage
3. Test the EVAP purge control valve for proper operation
4. Check the EVAP canister and associated hoses for any issues

How to fix DTC P0440 on BMW

To fix a DTC P0440 on a BMW, the following steps may be taken:

1. Replace the faulty EVAP purge control valve
2. Repair any leaks in the EVAP system
3. Replace the EVAP canister if necessary
4. Ensure all EVAP system hoses and connections are secure and in good condition

How to erase DTC P0440 on BMW

To erase a DTC P0440 on a BMW, the code can be cleared using a diagnostic scanner. After the necessary repairs have been made to address the underlying issue causing the code, the scanner can be used to clear the code from the vehicle’s memory.

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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