BMW DTC P221E – Reductant Heater ‘C’ Current Too Low
DTC P221E meaning on BMW
The DTC P221E code on a BMW indicates that the reductant heater ‘C’ current is too low. This code is specific to the reductant heater system, which is responsible for heating the diesel exhaust fluid (DEF) to optimize its performance in reducing emissions.
BMW DTC P221E symptoms
Symptoms of the DTC P221E code on a BMW may include:
- Check Engine Light illuminated
- Reduced engine performance
- Poor fuel efficiency
- Increased emissions
BMW DTC P221E causes
Common causes of the DTC P221E code on a BMW include:
- Faulty reductant heater ‘C’
- Wiring or connector issues in the reductant heater circuit
- Defective reductant heater control module
- Software issues
BMW DTC P221E seriousness
The DTC P221E code should not be ignored as it can lead to increased emissions and potential performance issues with the vehicle. It is important to address this code promptly to ensure proper operation of the reductant heater system and compliance with emissions regulations.
How to diagnose DTC P221E on BMW
To diagnose the DTC P221E code on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the reductant heater ‘C’ for any visible damage or defects
- Check the wiring and connectors in the reductant heater circuit for continuity and proper connection
- Test the reductant heater control module for proper function
How to fix DTC P221E on BMW
To fix the DTC P221E code on a BMW, the following steps may be taken:
- Replace the faulty reductant heater ‘C’
- Repair any damaged wiring or connectors in the reductant heater circuit
- Replace the defective reductant heater control module
- Update the software if necessary
How to erase DTC P221E on BMW
To erase the DTC P221E code on a BMW, a mechanic can use a diagnostic scanner to clear the fault codes after the necessary repairs have been made. This will reset the Check Engine Light and ensure that the code does not reappear if the issue has been successfully 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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