P2491 – BMW DTC

BMW DTC P2491 – EGR Cooler Bypass Control Circuit High (Bank 2)

DTC P2491 meaning on BMW

The Diagnostic Trouble Code (DTC) P2491 for BMW indicates an issue with the EGR (Exhaust Gas Recirculation) Cooler Bypass Control Circuit on Bank 2. This code is triggered when the Engine Control Module (ECM) detects a high voltage condition in the circuit that controls the EGR cooler bypass valve on Bank 2.

BMW DTC P2491 symptoms

Symptoms of DTC P2491 on a BMW may include:

• Check Engine Light illuminated on the dashboard
• Reduced engine performance
• Increased fuel consumption
• Possible rough idling or stalling

BMW DTC P2491 causes

Common causes of DTC P2491 on a BMW include:

• Faulty EGR cooler bypass valve
• Wiring or connector issues in the EGR cooler bypass control circuit
• ECM software or hardware problems

BMW DTC P2491 seriousness

While DTC P2491 may not always result in immediate drivability issues, it is important to address this code promptly to prevent potential damage to the engine or emissions system. Ignoring this code can lead to reduced fuel efficiency and increased emissions.

How to diagnose DTC P2491 on BMW

To diagnose DTC P2491 on a BMW, you can follow these steps:

1. Use a diagnostic scanner to retrieve the fault codes stored in the ECM.
2. Inspect the wiring and connectors in the EGR cooler bypass control circuit for any damage or corrosion.
3. Test the EGR cooler bypass valve for proper operation.
4. Check for any software updates available for the ECM.

How to fix DTC P2491 on BMW

To fix DTC P2491 on a BMW, you can try the following:

1. Replace the faulty EGR cooler bypass valve if necessary.
2. Repair any damaged wiring or connectors in the EGR cooler bypass control circuit.
3. Update the ECM software to the latest version.

How to erase DTC P2491 on BMW

To erase DTC P2491 on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the ECM. After addressing the underlying issue that caused the code, clearing the code will reset the Check Engine Light and monitor the system for any recurring faults.

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

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.