P20C0

Reductant Heater B Control Circuit High

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$28–89 (est.)

Symptoms

Check Engine light comes on
Reduced efficiency of the SCR system
Possible increase in fuel consumption
Exhaust gas treatment system error message
Engine power limitation (on some models)

Causes

Short circuit in the heater circuit
Reagent heating element malfunction
Wiring harness damage
Problems with the SCR control module
Corrosion of contacts or connectors

How to Fix

Check the integrity of the heater wiring harness
Test the resistance of the heating element
Check voltage and continuity of control circuit
Inspect connectors for corrosion or damage
If necessary, replace the heating element or wiring harness

Related codes

P20C1 P20B9 P20BA