P3499 – BMW DTC

BMW DTC P3499 – Cylinder 2 Deactivation Performance

DTC P3499 meaning on BMW

The Diagnostic Trouble Code (DTC) P3499 for BMW indicates a performance issue related to the deactivation of cylinder 2 in the engine. This code is specific to BMW vehicles and is triggered when the Engine Control Module (ECM) detects that the deactivation process for cylinder 2 is not functioning as intended.

BMW DTC P3499 symptoms

Symptoms of DTC P3499 on a BMW may include:

• Check Engine Light (CEL) illuminated on the dashboard
• Reduced engine performance or power
• Engine misfires or rough idling
• In some cases, the vehicle may go into a reduced power mode

BMW DTC P3499 causes

Common causes of DTC P3499 on a BMW include:

• Malfunctioning cylinder deactivation solenoid for cylinder 2
• Wiring issues or electrical faults in the cylinder deactivation system
• Low engine oil level or poor oil quality
• Mechanical issues with the cylinder 2 deactivation mechanism

BMW DTC P3499 seriousness

While DTC P3499 may not always result in immediate drivability issues, it is important to address this code promptly to prevent potential long-term damage to the engine. Ignoring this code can lead to decreased fuel efficiency, increased emissions, and potential engine damage over time.

How to diagnose DTC P3499 on BMW

To diagnose DTC P3499 on a BMW, a mechanic would typically perform the following steps:

1. Use a diagnostic scanner to retrieve the fault codes stored in the ECM
2. Inspect the cylinder deactivation solenoid for cylinder 2 and its wiring for any visible damage or corrosion
3. Check the engine oil level and quality to ensure it meets BMW specifications
4. Perform a visual inspection of the cylinder deactivation system components for any signs of wear or malfunction

How to fix DTC P3499 on BMW

Depending on the root cause of DTC P3499, the following steps may be taken to fix the issue on a BMW:

1. Replace the faulty cylinder deactivation solenoid for cylinder 2
2. Repair or replace any damaged wiring in the cylinder deactivation system
3. Ensure the engine oil level is correct and of good quality
4. If mechanical issues are found, repair or replace the affected components

How to erase DTC P3499 on BMW

After the underlying issue causing DTC P3499 has been addressed and fixed, the code can be erased from the ECM using a diagnostic scanner. The mechanic can clear the fault codes stored in the system, and if the issue has been successfully resolved, the Check Engine Light should no longer illuminate for DTC P3499.

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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