P20BF

Reductant Heater B Control Circuit Low

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
Increased fuel consumption
Possible starting problems in cold weather
Unpleasant exhaust smell

Causes

Reagent heater B malfunction
Open or short circuit in control circuit
Poor contact in connectors
Faulty relay or fuse
Problems with the SCR control module

How to Fix

Check heater circuit fuses and relays
Inspect the wiring harness for damage
Check heater resistance
Scan the SCR control module for errors
If necessary, replace the reagent heater

Related codes

P20BD P20BE P20C0