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The 12 code must be from when I put in the new PCM. Thats when the battery was disconnected. I can't believe the alternator went bad just two weeks after I replaced the PCM. I replaced the alternator this last weekend and all seems okay. Is there a way to reset the PCM so there are no error...

I don't know if there is a reason to intentionaly put it in overdrive while I am in second gear but I wonder if there would be a situation where the engine would rev too hi in second gear but would lug in third. I haven't looked at the gear ratios but maybe second gear and overdrive would keep...

I have a 92 4x4 with an automatic transmission. I am curious to know if the overdrive can be switched in, by bypassing the PCM, when the transmission is in 1st or 2nd gear or is there something mechanical in the transmission that won't let that happen until it gets to third gear. Don't know if...

Thanks everyone for the replies. I pretty much determined it's the alternernator that went bad. I'll have to remove it this weekend and take it somewhere to be tested. GD

I have a 1992 and I am getting an error code of 12. Was wondering if you could look in your PCM diagnostic manual and tell me what a 12 code refers to. Thanks GD

I just rechecked the error codes. The first one is 12 and the second one is 41. 12 is not listed in the factory shop manual I have. 41 says there is a problem in the alternator field circuit. I put 12 volts across the 2 alternator field terminals while the engine was running but there was still...

I had a problem similar to GHarman's. I would have strange things happen depending on the temperature. When I first started the truck the battery would not charge, the AC would not work and it would not go into overdrive. After the engine compartment got warm then everything would work...