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P0430 Diagnostic Trouble Code Discussion for October 2012

Catalyst System Low Efficiency (Bank 2)

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Trouble Ticket Help Requests for DTC P0430
Help Request Posted
2008 GMC W3500 Forward W3S042 6.0L MIL Lamp on
P0430: Catalyst System Low Efficiency Bank 2. Hello all and thank you in advance for any help. This truck has been in for these same problems once before. The customer had it at a dealer in Joliet and they declined replacement of the MAF sensor. I have checked Cat. back pressure and it was less than 2 psi...
October 16, 2012