Error code
OBD2 P0439
OBD2P0439
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Catalyst Heater Control Circuit.
Severity
moderateCan drive, but should address soon to prevent further damage.
Summary
P0439 indicates a malfunction in the control circuit of the catalytic converter heater on bank 2 of the engine.
Common Causes
- Wiring issues
- Relay problems
- ECM (Engine Control Module) failure
Fixes
FAQ
What does P0439 mean?
P0439 indicates a malfunction in the control circuit of the catalytic converter heater on bank 2.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
More OBD2 codes
- P0400Exhaust Gas Recirculation Flow
- P0401Exhaust Gas Recirculation Flow Insufficient Detected
- P0402Exhaust Gas Recirculation Flow Excessive Detected
- P0403Exhaust Gas Recirculation Control Circuit
- P0404Exhaust Gas Recirculation Control Circuit Range/Performance
- P0405Exhaust Gas Recirculation Sensor 'A' Circuit Low
- P0406Exhaust Gas Recirculation Sensor 'A' Circuit High
- P0407Exhaust Gas Recirculation Sensor 'B' Circuit Low
- P0408Exhaust Gas Recirculation Sensor 'B' Circuit High
- P0409Exhaust Gas Recirculation Sensor 'A' Circuit
- P0410Secondary Air Injection System
- P0411Secondary Air Injection System Incorrect Flow Detected