BMW DTC P2049 – Reductant Injection Valve Circuit High (Bank 1 Unit 1)
DTC P2049 meaning on BMW
DTC P2049 on a BMW indicates a fault with the Reductant Injection Valve Circuit High for Bank 1 Unit 1. This fault code is related to the reductant injection system, which is responsible for reducing harmful emissions by injecting a urea-based solution into the exhaust stream to convert nitrogen oxides into harmless nitrogen and water.
BMW DTC P2049 symptoms
Symptoms of DTC P2049 on a BMW may include:
- Check Engine Light illuminated
- Reduced engine performance
- Increased fuel consumption
- Failed emissions test
BMW DTC P2049 causes
Common causes of DTC P2049 on a BMW include:
- Faulty reductant injection valve
- Wiring or connector issues in the reductant injection valve circuit
- ECU (Engine Control Unit) software issues
BMW DTC P2049 seriousness
DTC P2049 should not be ignored as it can lead to increased emissions and potential engine performance issues. It is important to address this fault code promptly to ensure the vehicle operates efficiently and meets emission standards.
How to diagnose DTC P2049 on BMW
To diagnose DTC P2049 on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and related data
- Inspect the reductant injection valve and its wiring for any visible damage
- Test the reductant injection valve circuit for proper voltage and continuity
- Check for any software updates for the ECU related to the reductant injection system
How to fix DTC P2049 on BMW
To fix DTC P2049 on a BMW, the following steps may be taken:
- Replace the faulty reductant injection valve if necessary
- Repair any damaged wiring or connectors in the reductant injection valve circuit
- Update the ECU software to the latest version
- Clear the fault code and perform a test drive to ensure the issue is resolved
How to erase DTC P2049 on BMW
To erase DTC P2049 on a BMW, a diagnostic scanner can be used to clear the fault code from the ECU’s memory. After the fault code is cleared, it is recommended to perform a test drive to verify that the issue has been resolved and the Check Engine Light does not reappear.
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.