garajizOBD-II code · generic
P0439
Catalyst Heater Control Circuit
- System
- P0 — Powertrain (generic)
- Severity
- Minor (2/5)
- Can I keep driving?
- Usually safe to drive
What does P0439 mean?
P0439 is defined as “Catalyst Heater Control Circuit”.
You can usually keep driving, but have it checked soon so a small fault doesn’t become a bigger one.
Related codes
- P0438Catalyst Temperature Sensor High
- P043ACatalyst Temperature Sensor Circuit Bank 2 Sensor 2
- P0437Catalyst Temperature Sensor Low
- P043BCatalyst Temperature Sensor Circuit Range/Performance Bank 2 Sensor 2
- P0436Catalyst Temperature Sensor Range/Performance
- P043CCatalyst Temperature Sensor Circuit Low Bank 2 Sensor 2
Look up another code
This page is general information; an exact diagnosis needs measurements and a technician’s check.