P20B6

Reductant Metering Unit Heater Control Circuit Performance

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–278 (est.)

Symptoms

Check Engine Light Is On
Reduced engine power
Increased fuel consumption
Possible starting problems in cold weather
AdBlue system error message on the dashboard

Causes

Open or short circuit in the heater circuit
Malfunction of the heating element of the injection unit
Problems with the heater circuit relay or fuse
SCR control module malfunction
Poor contact in heater circuit connectors

How to Fix

Check heater circuit fuses and relays
Check the integrity of wires and connectors
Measure the resistance of the heating element
Check the operation of the SCR control module
If necessary, replace the AdBlue injection unit

Related codes

P20B7 P20B8 P20B9