P1406
Heated Catalyst Internal Control Module Checksum/ROM Error
BMW
Auxiliary Emissions Control
Medium severity
Moderate repair
Free on OBD DashX
Want real-world data on P1406?
See which problems come with P1406, how often it shows up in other vehicles, and how to fix it — step by step.
- Real-world fix data
- How often it happens
- Step-by-step repairs
What P1406 means
- Heated Catalyst Internal Control Module Checksum/ROM Error
- Internal malfunction detected in heated catalyst control module
Log in to see the full breakdown
This is a manufacturer-specific code. Free CaRPM account, no card needed.
Symptoms
Causes
Related parts
Solutions
Log in to read more
Free on OBD DashX
P1406 on OBD DashX
Real-world causes, how often this code shows up, and the fix — step by step.
Open P1406 No sign-up needed · available in 10 languagesScan your own car
Read and clear fault codes, live data and service resets with the CaRPM app.