BMW DTC P3404 – Cylinder 1 Deactivation/Intake Valve Control Circuit High
DTC P3404 meaning on BMW
The DTC P3404 code on a BMW indicates an issue with the Cylinder 1 Deactivation/Intake Valve Control Circuit being detected as high. This means that there is a problem with the electrical circuit controlling the deactivation or activation of the intake valve in cylinder 1.
BMW DTC P3404 symptoms
Symptoms of the DTC P3404 code on a BMW may include:
- Check Engine Light illuminated
- Engine running rough
- Reduced engine performance
- Engine misfires
BMW DTC P3404 causes
Common causes of the DTC P3404 code on a BMW include:
- Faulty intake valve control solenoid
- Wiring issues in the intake valve control circuit
- ECU (Engine Control Unit) malfunction
- Mechanical problem with the intake valve
BMW DTC P3404 seriousness
The DTC P3404 code should not be ignored as it can lead to engine performance issues and potential damage if left unresolved. It is recommended to address this issue promptly to prevent further complications.
How to diagnose DTC P3404 on BMW
To diagnose the DTC P3404 code on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the intake valve control solenoid for proper operation
- Check the wiring and connectors in the intake valve control circuit for any damage or loose connections
- Test the ECU for any malfunctions
- Perform a compression test on cylinder 1 to check for mechanical issues
How to fix DTC P3404 on BMW
To fix the DTC P3404 code on a BMW, the following steps may be taken:
- Replace the faulty intake valve control solenoid
- Repair any damaged wiring or connectors in the intake valve control circuit
- Address any ECU malfunctions by reprogramming or replacing the unit
- If a mechanical issue is found, repair or replace the affected components
How to erase DTC P3404 on BMW
To erase the DTC P3404 code on a BMW, the fault must first be fixed. Once the issue has been resolved, a diagnostic scanner can be used to clear the fault codes stored in the ECU. This will reset the Check Engine Light and remove the DTC P3404 code from the system.
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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