What does code P0430 mean on a Cadillac and is it safe to drive?
P0430: Catalyst System Efficiency Below Threshold (Bank 2). Here's what it means on your Cadillac, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
PowertrainMedium urgency
What this code means
Same as P0420 but for bank 2. The catalytic converter on bank 2 is not operating efficiently.
Common causes for your Cadillac
- Failed catalytic converter (bank 2)
- Faulty O2 sensor(s)
- Exhaust leak
Symptoms
- Check Engine Light
- May fail emissions
Typical fixes
- Replace bank 2 catalytic converter
- Replace oxygen sensors
- Repair exhaust leaks
Repair cost range
For a Cadillac, repairs for P0430 often fall between $400 and $2400, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Cadillac
Cadillac 3.6L V6 P0430 bank 2 catalyst mirrors P0420. On LGX and LFX engines, verify both bank fuel trims are correct before replacing the converter—oil consumption-related rich conditions from VVT actuator wear can poison bank 2 catalysts prematurely.
Most commonly affected models
SRX 3.6L 2010–2016CTS 3.6L 2014–2019XT5 3.6L 2017–2022