I have some PCM codes that I cannot seem to cure on my own and my service light is on. I have seen in other threads of people that have had codes being deleted and some are the same codes, two in specific are P0300, P0103. I also have P0101, P0161, P1371, I know what the descriptions are but cannot seem to remedy them even after checking everything and I wonder if the P0300 is a common one that the modifications can cause and you may not be able to get rid of unless it is deleted. Also if codes are deleted so that the service light goes out will that cause a fail on emissions testing for OBD2 ’97 TA Ram Air WS6
LT4 hot cam conv., BBK 52mm throttle body, Fernco coupler, LT4 timing chain, accel 30# injectors, accel 300+ ignition, MSD 8.5mm wires, Granatelli MAF sensor, Transgo shift kit, TCI super streetfighter lockup 3500, BBK headers, flowmaster AT exhaust, superchips custom program, BFG drag radials

 

Not knowledgable about the codes. Seems though that the codes are trying to tell you something isn't right. So resolving the problem would be my initial concern (or at least make sure they are not of a serious nature).

PCMs can be programmed to block readouts. If your codes are associated with any of the readouts that the emissions people need to look at, but can't see because they have been blocked, you may not pass emissions.

This happened to me when Ed Wright blocked some readouts. I had to reinstall my stock PCM to get the car passed the emission people.

Had PCMFORLESS reprogram PCM and asked that the readouts NOT be blocked. I have to go through Emissions this weekend. I sure hope they can read the PCM and I pass. Otherwise I'm screwed.

 

If you clear your trouble codes just before you take your emissions test you will fail. Where I live emission testing consists of scanning the PCM for trouble codes, I cleared codes just before and failed. The emission testing machine said the PCM was not ready. Your only option is to investigate the problems further or somehow program the problem out of your PCM.