P20C6

Reductant Heater D Control Circuit Performance

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$28–133 (est.)

Symptoms

Check Engine Light Is On
Reduced engine power
Increased fuel consumption
Incorrect operation of the SCR system
Possible starting problems in cold weather

Causes

Open or short circuit in the heater circuit
Reagent heating element malfunction
Problems with the relay or circuit fuse
SCR control unit malfunction
Corroded or damaged connectors

How to Fix

Check the integrity of the heater circuit
Check the resistance of the heating element
Inspect connectors and wiring harness for damage
Check the operation of relays and fuses
If necessary, replace the heating element

Related codes

P20C5 P20C7 P20C8