P0439

Catalyst Heater Control Circuit/Open Bank 2

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine light comes on
Deterioration of environmental indicators
Possible increase in fuel consumption

Causes

Open or short circuit in wiring harness
Heating circuit relay or fuse malfunction
Damage to the catalytic converter heating element
Problems with the engine control unit (ECU)

How to Fix

Check the integrity of the fuses and relays of the heating circuit
Inspect the wiring harness for damage
Check the resistance of the heating element
Scan the control unit for additional errors
Replace damaged components if necessary

Related codes

P0420 P0430 P0440