P3429 – BMW DTC

BMW DTC P3429 – Cylinder 4 Exhaust Valve Control Circuit/Open

DTC P3429 meaning on BMW

DTC P3429 on a BMW indicates a fault with the Cylinder 4 Exhaust Valve Control Circuit, specifically an open circuit. This means that the Engine Control Module (ECM) has detected a lack of continuity or a break in the electrical circuit controlling the exhaust valve for cylinder 4.

BMW DTC P3429 symptoms

Symptoms of DTC P3429 on a BMW may include:

• Check Engine Light illuminated
• Engine running rough or misfiring
• Reduced engine performance
• Increased fuel consumption

BMW DTC P3429 causes

Common causes of DTC P3429 on a BMW include:

• Faulty exhaust valve control solenoid
• Open or short circuit in the wiring harness
• Faulty Engine Control Module (ECM)

BMW DTC P3429 seriousness

DTC P3429 should be addressed promptly as it can lead to poor engine performance and potentially cause damage to the engine over time if left unresolved.

How to diagnose DTC P3429 on BMW

To diagnose DTC P3429 on a BMW, you can follow these steps:

1. Use a diagnostic scanner to retrieve the fault code and freeze frame data
2. Inspect the wiring harness for any visible damage or breaks
3. Test the exhaust valve control solenoid for proper operation
4. Check the ECM for any stored codes related to the circuit

How to fix DTC P3429 on BMW

To fix DTC P3429 on a BMW, you may need to:

1. Replace the faulty exhaust valve control solenoid
2. Repair any open or short circuits in the wiring harness
3. If the ECM is faulty, it may need to be replaced or reprogrammed

How to erase DTC P3429 on BMW

To erase DTC P3429 on a BMW, you can:

1. Use a diagnostic scanner to clear the fault code
2. After making the necessary repairs, drive the vehicle to allow the ECM to run its diagnostic tests
3. If the issue has been resolved, the Check Engine Light should turn off

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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