P0429 - Catalyst Heater Control Circuit (Bank 1)

The ECM detected a fault in catalyst heater control circuit on bank 1.

Code Overview

The ECM detected a fault in catalyst heater control circuit on bank 1.

Common Causes

• Catalyst heater control fault
• Damaged wiring or connector
• Relay or power supply issue

Diagnostic Steps

1. Inspect the heater circuit wiring and connectors
2. Check fuse, relay, and power feed
3. Look for related catalyst or temperature-sensor codes

Likely Repairs & Cost Guides

Use test results to confirm the fault before pricing the repair.

Related OBD Codes

Browse the closest code-family pages when the same fault pattern often shows up nearby.

Next Steps

Move from the code to a diagnosis path, then into repair pricing once the fault is confirmed.