p0430
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Chevrolet · SUVs
Catalyst System Efficiency Below Threshold Bank 2
Quick Answer
Error code P0430 on your Chevrolet SUVs means: Catalyst System Efficiency Below Threshold Bank 2. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
CL14636CL14606Blazer LT 2024Blazer Premier 2024Blazer RS 2024Equinox Activ 2024Equinox LT 2024Equinox RS 2024Suburban High Country 2024Suburban LS 2024Suburban LT 2024Suburban Premier 2024Suburban RST 2024Tahoe High Country 2024Tahoe LS 2024Tahoe LT 2024Tahoe Premier 2024Tahoe RST 2024Tahoe Z71 2024Trailblazer Activ 2024Trailblazer LS 2024Trailblazer LT 2024Trailblazer RS 2024Traverse LS 2024Traverse LT 2024Traverse Premier 2024Traverse RS 2024Traverse Z71 2024Trax Activ 2024Trax LS 2024Trax LT 2024Trax RS 2024CL14526CL14506CK10906CK10706CL14456CL14806CL14416
Likely Causes
How to Fix It
1
Scan for related codes and check freeze frame data for operating conditions
2
Monitor bank 2 upstream and downstream O2 sensor signals at steady cruise
3
Check for exhaust leaks around the bank 2 converter
4
Use an infrared thermometer to compare converter inlet and outlet temperatures
5
Replace the bank 2 catalytic converter if efficiency is confirmed low
Pro Tip
This issue typically requires professional diagnosis. Attempting this fix without proper training could cause further problems.
Parts You May Need
Catalytic converter (bank 2)
Downstream O2 sensor (bank 2 sensor 2)
Exhaust gaskets and clamps
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