Question

I have the engine code P20b9 on my 2011 Ford F350 6.7L Diesel. What does the heater control do and where is it located?

Answer 1

The P20b9 code will be set when the Engine Control Module (ECM) indicates the reductant tank heater control circuit is open for greater than 4 s.

Possible Causes:

• Faulty Reductant Heater
• Reductant Heater harness is open or shorted
• Reductant Heater circuit poor electrical connection
• Faulty Reductant Pump and Sensor Assembly
• Faulty Reductant Control Module

P20B9 FORD - Reductant Heater 'A' Control Circuit/Open
Read more: https://www.autocodes.com/p20b9_ford.html