BMW DTC P2045 – Reductant Temperature Sensor ‘A’ Circuit High
DTC P2045 meaning on BMW
The Diagnostic Trouble Code (DTC) P2045 for BMW refers to the Reductant Temperature Sensor ‘A’ Circuit High. This code indicates that the engine control module (ECM) has detected a high voltage signal from the reductant temperature sensor ‘A’, which is used to monitor the temperature of the diesel exhaust fluid (DEF) in the selective catalytic reduction (SCR) system.
BMW DTC P2045 symptoms
Symptoms of DTC P2045 on a BMW may include:
- Check Engine Light (CEL) illuminated on the dashboard
- Reduced engine performance
- Possible DEF system warnings
BMW DTC P2045 causes
The common causes of DTC P2045 on a BMW include:
- Faulty reductant temperature sensor ‘A’
- Wiring or connector issues in the sensor circuit
- ECM software or hardware problems
BMW DTC P2045 seriousness
While DTC P2045 may not cause immediate drivability issues, it is important to address this code promptly to prevent potential damage to the SCR system and ensure compliance with emissions regulations.
How to diagnose DTC P2045 on BMW
To diagnose DTC P2045 on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault codes stored in the ECM.
- Inspect the wiring and connectors related to the reductant temperature sensor ‘A’ for any visible damage or corrosion.
- Test the reductant temperature sensor ‘A’ using a multimeter to check for proper resistance values.
- Check for any software updates available for the ECM that may address the issue.
How to fix DTC P2045 on BMW
To fix DTC P2045 on a BMW, you can try the following solutions:
- Replace the faulty reductant temperature sensor ‘A’ with a new OEM part.
- Repair or replace any damaged wiring or connectors in the sensor circuit.
- If necessary, update the ECM software to the latest version.
How to erase DTC P2045 on BMW
To erase DTC P2045 on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the ECM. After addressing the underlying issue causing the code, you can reset the CEL 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
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