BMW DTC P20E8 – Reductant Pressure Too Low
DTC P20E8 meaning on BMW
The Diagnostic Trouble Code (DTC) P20E8 for BMW indicates that the reductant pressure is too low. In BMW vehicles, this code specifically relates to the pressure of the diesel exhaust fluid (DEF) or AdBlue, which is used in the Selective Catalytic Reduction (SCR) system to reduce emissions of nitrogen oxides (NOx).
BMW DTC P20E8 symptoms
Symptoms of the DTC P20E8 in a BMW may include:
- Check Engine Light (CEL) illuminated
- Reduced engine performance
- Increased emissions
- Possible limp mode activation
BMW DTC P20E8 causes
The common causes of the DTC P20E8 in a BMW include:
- Low DEF fluid level
- DEF injector issues
- DEF pump malfunction
- Pressure sensor failure
- Wiring or connection problems
BMW DTC P20E8 seriousness
The DTC P20E8 should not be ignored as it can lead to increased emissions and potential engine performance issues. If left unresolved, it may also cause the vehicle to fail emissions tests and could result in further damage to the SCR system.
How to diagnose DTC P20E8 on BMW
To diagnose the DTC P20E8 on a BMW, you can perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes
- Check the DEF fluid level and quality
- Inspect the DEF injector and pump for proper operation
- Test the reductant pressure sensor
- Inspect the wiring and connections for any damage
How to fix DTC P20E8 on BMW
To fix the DTC P20E8 on a BMW, you may need to:
- Refill or top up the DEF fluid to the correct level
- Replace any faulty DEF injectors or pumps
- Repair or replace the reductant pressure sensor if necessary
- Ensure all wiring and connections are secure and free of damage
How to erase DTC P20E8 on BMW
After fixing the underlying issue causing the DTC P20E8, you can erase the code by:
- Using a diagnostic scanner to clear the fault codes
- Driving the vehicle through a complete drive cycle to ensure the code does not return
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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