P2490 – BMW DTC

BMW DTC P2490 – EGR Cooler Bypass Control Circuit Low (Bank 2)

DTC P2490 meaning on BMW

The Diagnostic Trouble Code (DTC) P2490 for BMW refers to the EGR (Exhaust Gas Recirculation) Cooler Bypass Control Circuit Low on Bank 2. This code indicates that there is a low voltage condition detected in the control circuit of the EGR cooler bypass system on Bank 2 of the engine.

BMW DTC P2490 symptoms

Symptoms of DTC P2490 on a BMW may include:

• Check Engine Light (MIL) illuminated
• Reduced engine performance
• Increased fuel consumption
• Engine running rough or stalling

BMW DTC P2490 causes

Common causes of DTC P2490 on a BMW include:

• Faulty EGR cooler bypass control solenoid
• Wiring or connector issues in the EGR cooler bypass control circuit
• Internal ECU (Engine Control Unit) fault

BMW DTC P2490 seriousness

While DTC P2490 may not cause immediate drivability issues, it is important to address this code promptly to prevent potential damage to the engine and emissions system. Ignoring this code can lead to reduced engine efficiency and increased emissions.

How to diagnose DTC P2490 on BMW

To diagnose DTC P2490 on a BMW, you can follow these steps:

1. Use a diagnostic scanner to retrieve the fault codes and freeze frame data
2. Inspect the EGR cooler bypass control solenoid for proper operation
3. Check the wiring and connectors in the EGR cooler bypass control circuit for any damage or corrosion
4. Perform a voltage test on the EGR cooler bypass control circuit to check for proper voltage levels
5. Inspect the ECU for any signs of internal faults

How to fix DTC P2490 on BMW

To fix DTC P2490 on a BMW, you can try the following:

1. Replace the faulty EGR cooler bypass control solenoid
2. Repair or replace any damaged wiring or connectors in the EGR cooler bypass control circuit
3. If the ECU is found to be faulty, it may need to be reprogrammed or replaced

How to erase DTC P2490 on BMW

To erase DTC P2490 on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the ECU. After the repair has been completed, you can reset the codes and perform a test drive to ensure the issue has been resolved.

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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