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Mine has been doing the same thing. I cannot figure it out for the life of me either. I wish someone has been through this that could help us.

I gave up on the car but I think I will go back to it and try it once more.

I gotcha. ill check that out, I appreciate the help.

I will check this out, but would you not expect to get throttle body codes or not necessarily.

I understand what you are saying but before it was parked. He put in the used PCM and it did fine shifting. I just thought that the bad coils caused a pcm strain and fried it.

Yes, had to take of intake to do head temp sensor. But ive put in a pcm three times, one of them fixed by SIA twice, and a used one I had. Each time it is doing different things (going into failsafe and not), shifting hard at different points.

The car has a new transmission with maybe 1000 miles on it. You would think it would be okay, but I guess not with these cars.

SIA said the first time they repaired transmission circuitry. The second time they said that they repaired a loose capacitor in transmission circuitry. I did not try resetting the battery and going again on the other PCM.

So, finally got my car going (03 ls v8). The car was sitting for a few years due to harsh shifting in the transmission. Before it sat my buddy had replaced the transmission with a new one and it still shifted hard. He bought a used PCM on eBay and fixed the issue for about 6 months then started...

I gotcha. Yeah I’m gonna check out the relays and all and see if I can find something.

Are you talking about the SSP fuses in the trunk area?

Thanks, I will check that out. I tried to get the codes from the light the other day but it just kept rapidly flashing. I might have not waited long enough. I’ll try again today. What do you mean by SSP circuits?

So I ended up using graphite powder and worked the hell out of it and FINALLY got it free. My next problem is that the pats light is still blinking and when I turn the ignition to run the cluster tach and mph wraps then comes back to 0 like normal, only problem is that it doesn’t show the...

Oh yes. It is definitely not locked.

That is what I am leaning too as well. I am going to try a few things to see.

So, the car has sat for a number of years. Before it got parked the transmission was replaced with a new one to fix the hard shifting problems. It did not fix the car, so it was parked. So, when I got to it, I sent the pcm to a company to fix the hard shifting issue. I got the pcm back in the...