P20B9

Reductant Heater A Control Circuit/Open

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–89 (est.)

Symptoms

Check Engine Light Is On
Reduced engine power
Increased fuel consumption
SCR System Error Message
Emission control system malfunction

Causes

Broken wire in the heater circuit
Heating element malfunction
Heater control relay problems
Short circuit in the circuit
SCR control module malfunction

How to Fix

Check the integrity of wires and connections
Check the resistance of the heating element
Check the operation of the control relay
Check heater circuit fuses
Diagnostics of the SCR control module

Related codes

P20B8 P20BA P20BB