2005 PT Cruiser P0605, P0700, and P1391 Error Codes Explained - After Catalyst Replacement
I recently installed a new catalytic converter on my 2005 PT Cruiser to pass smog inspection, but the engine light has come back on. The check engine light is now active with error codes P0605, P0700, and P1390. I'm not sure what these codes mean or how they're related to my catalytic converter replacement. Can anyone explain the causes of these specific OBD2 trouble codes in a PT Cruiser? Any guidance on whether this is a sensor issue, PCM problem, or something else would be greatly appreciated.
Check the official OBD2 diagnostic database for P0605 (Fuel Pump Control Circuit), P0700 (Transmission Control System Malfunction), and P1391 (Catalyst System Efficiency Below Threshold). These codes may indicate a communication issue with the Powertrain Control Module (PCM) or a sensor misalignment after catalytic converter installation. A professional diagnostic tool is recommended to interpret these codes accurately, especially since P0605 often points to fuel pump circuit problems and can be triggered by electrical faults post-replacement.