Powertrain
generic / SAE
P0439
Catalyst Heater Control Circuit/Open (Bank 2)
The drive circuit for the heated catalyst on bank 2 is open. Heated catalysts use an electrical heating element to reach light-off temperature within seconds of cold start.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / 39
Possible causes
- Heater element or wiring open high
- Pin pushed back out of connector body low
- Cracked solder joint inside the module or sensor low
Symptoms
- Check engine light on
- Failed emissions inspection
- Possibly slightly increased fuel consumption
- Sulfur (rotten egg) smell from exhaust under load
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
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References
sae:J2012