P20C9
Reductant Control Module Requested MIL Illumination
P20C9 is an OBD-II diagnostic trouble code meaning: Reductant Control Module Requested MIL Illumination. Common causes: reducer control module malfunction, low level or poor quality of reagent (adblue). Estimated repair cost: $17–89.
Symptoms
- Check Engine light is on
- Reduced engine power (emergency operation mode)
- Increased fuel consumption
- Unpleasant exhaust smell
- Error message on display
Causes
- Reducer control module malfunction
- Low level or poor quality of reagent (AdBlue)
- Problems with NOx sensors
- Open or short circuit in control circuit
- Software error in SCR module
How to Fix
- Check the level and quality of AdBlue reagent
- Diagnose the reductant control module
- Check NOx sensors and their wiring
- Scan the system for other related codes
- Update SCR module software if necessary
Related codes
Error P20C9 by Vehicle Brand
FAQ
What does the P20C9 code mean?
P20C9 is an OBD-II diagnostic trouble code that indicates: Reductant Control Module Requested MIL Illumination
What causes a P20C9 error code?
The most common causes of P20C9 include: Reducer control module malfunction; Low level or poor quality of reagent (AdBlue); Problems with NOx sensors; Open or short circuit in control circuit.
How do I fix a P20C9 diagnostic trouble code?
To fix P20C9: Check the level and quality of AdBlue reagent. Diagnose the reductant control module. Check NOx sensors and their wiring. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P20C9?
Limited driving only, diagnose soon
How much does it cost to fix P20C9?
The estimated repair cost for P20C9 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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