P20BA

Reductant Heater A Control Circuit Performance

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$33–167 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
Increased urea consumption
Increased NOx emissions
Inability to activate DPF regeneration

Causes

Open or short circuit in the heater circuit
Heater control relay malfunction
Damaged heating element
Connector connection problems
SCR control module malfunction

How to Fix

Check the integrity of the heater power supply circuit
Measure the resistance of the heating element
Test the operation of the control relay
Check the connections and connectors of the circuit
If necessary, replace the heating element
Reset the error and check the system operation

Related codes

P20BB P20BD P20E8