P20BD

Reductant Heater B Control Circuit/Open

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$28–133 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
Deterioration of environmental indicators
Possible messages indicating a malfunction of the SCR system
Problems starting in cold weather (if the reagent is frozen)

Causes

Open or short circuit in the heater circuit
Reagent heating element malfunction
Problems with the relay or circuit fuse
SCR control module malfunction
Oxidation or corrosion of connector contacts

How to Fix

Check the integrity of the heater circuit wires
Check the resistance of the heating element
Inspect the system fuses and relays
Diagnose the SCR control module
Clean circuit connector contacts

Related codes

P20B9 P20BA P20BB P20BC