P20C7

Reductant Heater D Control Circuit Low

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine light comes on
Reduced engine power (emergency mode)
Increased fuel consumption
Increased NOx emissions
SCR system error message on dashboard

Causes

Open or short circuit in the heater circuit
Reductant heater malfunction
Relay or fuse problems
Poor contact in connectors
SCR control module malfunction

How to Fix

Check heater circuit fuses and relays
Inspect the wiring harness for damage
Check heater resistance
Check the voltage at the heater terminals
If necessary, replace the reductant heater

Related codes

P20C8 P20C9 P20CA