P20BB

Reductant Heater A Control Circuit Low

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine Light Is On
Reduced engine power
Increased fuel consumption
SCR system error message on dashboard
Problems starting in cold weather

Causes

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

How to Fix

Check heater circuit fuses and relays
Inspect wiring and connectors for damage
Check the resistance of the heating element
Test the operation of the SCR control module
Replace the faulty heater if necessary

Related codes

P20B9 P20BA P20BD