P0439

DTC P0439, sometimes indicated as P043900 is an OBD diagnostic trouble code indicating a generic fault with the vehicle powertrain (i.e. engine and gearbox). This code identifies an error with the auxiliary emissions system causing catalyst heater control circuit (bank 2).

This code is related to the Catalyst Heater Control Circuit on Bank 2. This may indicate a problem with the heater, or with the wiring or connectors associated with it.
If this code is detected, it is recommended that the system be inspected by a qualified technician to determine the cause.

• P0439: Catalyst Heater Control Circuit (Bank 2)
• P0439: Catalyst Heater Control Circuit Bank 2
• P0439: Catalyst Heater Control (Bank 2)
• P0439: Catalytic converter heater, bank 2 – circuit malfunction
• P0439 00: Catalytic converter heater, bank 2 - circuit malfunction