CODE P0430 GMC - GMC Cars & Trucks

Christopher, BMW P0430 code catalyst efficiency fault, the converter is no longer able to do its job and may need replace.
Check the attached links very informative, instruction and guides, Good luck
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JE Robison Service Bosch Car Service Specialists the blog Those dreaded...
P0430 Replace the O2 sensor
P0430 P0420 Catalyst inefficiency do have to replace cats E46Fanatics
P0430 OBD II Trouble Code

Definition of Diagnostic Trouble Code P0420 Category: Powertrain Definition: Catalyst System Efficiency Below Threshold Bank 1Note: This definition of P0420 is applied to all manufacturers

Definition of Diagnostic Trouble Code P0430 Category: Powertrain Definition: Catalyst System Efficiency Below Threshold Bank 2Note: This definition of P0430 is applied to all manufacturers

As the code description implies the P0430 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0430 code is combined with other codes, try fixing the other codes first.

Check out related help links to troubleshoot these common error OBD code noticed on many brand vehicles:------
1998 GMC K1500: OBD Error Code P0430? http://schematicsdiagram.blogspot.in/2012/06/1998-gmc-k1500-obd-error-code-p0430.html

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OBD code P0301, P0430 and P0174? http://schematicsdiagram.blogspot.in/2012/02/obd-code-p0301p0430-and-p0174.html

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These will help.
Thanks.

Check out related help links to troubleshoot these common error OBD code noticed on many brand vehicles:------
1998 GMC K1500: OBD Error Code P0430?http://schematicsdiagram.blogspot.in/2012/06/1998-gmc-k1500-obd-error-code-p0430.html

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OBD code P0301, P0430 and P0174?http://schematicsdiagram.blogspot.in/2012/02/obd-code-p0301p0430-and-p0174.html

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These will help.
Thanks.

This is an emissions DTC, you can get help with this link on how to trouble shoot an solve your problem http://www.obd-codes.com/p0430

catalyst efficiency below threshold bank 2 that means to install a need oxygen sensor bank 2

P0131 Gmc HO2S Circuit Low Voltage Bank 1 Sensor 1
P0151 Gmc HO2S Circuit Low Voltage Bank 2 Sensor 1
P0452 Gmc Fuel Tank Pressure Sensor Circuit Low Voltage
P0430 Gmc Catalyst System Low Efficiency Bank 2

I think thats a bad cat converter

P0430 Catalyst System Efficiency Below Threshold (Bank 2)

P0441 Evaporative Emission Control System Incorrect Purge Flow
with p0441 did you replace the gas cap on all the way? that will cause this code every time. and or have you ever replaced the gas cap?