Answer

It looks like you have two seprate issues unless the pcm failing has caused both. For the first code you would need to bring vehicle to dealership to see if there is a software update if not they can identify if the tcm or the pcm needs to be replaced and for the second code it means you have a small leak and the only way to find the leak is bring vehicle to a shop so they can perform a smoke test. They will force smoke into the gastank and have to visually monitor it for leaks otherwise you are stuck replacing parts and could still overlook the cause. Let me know if you have questions or if there is anything else I can do to help. Thanks

 

P0604 Control Module Internal Random Access Memory Error

Possible Causes	Setting Conditions
PCM or TCM has an internal problem or has failed. Substitute a known good PCM or TCM and recheck for the same code. If the code does not reset, the original controller has failed. The new PCM or TCM may need to be reprogrammed.

P0442 EVAP System Small Leak (0.040") Detected

Possible Causes

Setting Conditions

Canister Purge valve is damaged, leaking or it has failed Charcoal canister or the "catch" tank is leaking Fuel filler cap loose, cross-threaded, incorrect part or damaged Fuel filler cap 'O' ring is missing or damaged Fuel tank is cracked (leaking), or a leak exists in the fuel tank 'O' ring Fuel tank pressure sensor has failed Fuel trapped in the fuel vapor lines due to faulty Rollover Valve or ORVR valve Fuel vapor line(s), fuel pipes or hoses damaged, leaking or missing Leak detection module has failed Purge solenoid has failed (it may be damaged, leaking or sticking) Vent solenoid has failed (it may be damaged, leaking or sticking) PCM has failed