P20C8

Reductant Heater D Control Circuit High

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
Performance degradation
Possible SCR system error messages
Increased emissions

Causes

Short circuit in the heater circuit
Heating element malfunction
Problems with the wiring harness or connectors
Heater control module malfunction
Problems with the engine ECU

How to Fix

Check the integrity of the heater circuit
Test the resistance of the heating element
Inspect connectors and wiring harness for damage
Check the operation of the heater control module
If necessary, replace faulty components

Related codes

P20C7 P20C9 P20CA