Error code
OBD2 P0429
OBD2P0429
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Catalyst Heater Control Circuit.
Severity
moderateCan be driven but may cause further damage or emissions issues.
Summary
P0429 indicates a malfunction in the control circuit of the catalytic converter heater on bank 1, which is part of the exhaust system.
Common Causes
- Wiring issues
- Relay failure
- ECM (Engine Control Module) problem
Fixes
- Repair or replace faulty wiring, relay, or ECM.
FAQ
What does P0429 mean?
P0429 indicates a malfunction in the control circuit of the catalytic converter heater on bank 1.
How serious is P0429?
It's moderately serious. While you can drive with it, ignoring it may cause further damage or emissions issues.
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