P20B5 - OBD II Trouble Code

Our automotive experts have put together the following information about the P20B5 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P20B5 code.

OBD II Fault Code

• OBD II P20B5

OBD-II Code Wiring issue is defined as a Reductant Metering Unit Heater Control Circuit/Open

The heating unit for the Reductant (DEF) system ensures that the DEF fluid does not freeze or crystallize between tank and the injector. If the heating unit does not operate as requested, code P20B5 is stored.

Wiring issue Symptoms

• DPF regeneration may not occur

Common Problems That Trigger the P20B5 Code

• Delivery module heater failure
• Power heater module power switch failure
• Wiring issue