P05F8
Reductant Heater Control Module Performance
P05F8 is an OBD-II diagnostic trouble code meaning: Reductant Heater Control Module Performance. Common causes: heater control module internal fault, faulty adblue reagent temperature sensor. Estimated repair cost: $89–389.
Symptoms
- AdBlue/SCR system fault warning
- Check Engine Light Is On
- AdBlue freezing in cold weather (insufficient heating)
- Ammonia smell (reagent overheating)
- Unstable operation of the SCR system at low temperatures
Causes
- Heater control module internal fault
- Faulty AdBlue reagent temperature sensor
- Heating element malfunction (burnout)
- AdBlue system is dirty or clogged
- AdBlue ECU malfunction
How to Fix
- Read codes using a specialized scanner for the SCR/AdBlue system
- Check AdBlue temperature sensor
- Check the heating element of the tank for integrity (measure resistance)
- Check the heating elements of the AdBlue lines
- Check power supply and control signals of the heater module
- Diagnose or replace AdBlue heater control module
Related codes
Error P05F8 by Vehicle Brand
FAQ
What does the P05F8 code mean?
P05F8 is an OBD-II diagnostic trouble code that indicates: Reductant Heater Control Module Performance
What causes a P05F8 error code?
The most common causes of P05F8 include: Heater control module internal fault; Faulty AdBlue reagent temperature sensor; Heating element malfunction (burnout); AdBlue system is dirty or clogged.
How do I fix a P05F8 diagnostic trouble code?
To fix P05F8: Read codes using a specialized scanner for the SCR/AdBlue system. Check AdBlue temperature sensor. Check the heating element of the tank for integrity (measure resistance). For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P05F8?
Yes, but get it checked soon
How much does it cost to fix P05F8?
The estimated repair cost for P05F8 is $89–389. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat