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Old 05-12-2004, 09:30 PM   #1
1 Tired Ram
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Join Date: May 2004
Location: Freeport, Illinois
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1997 5.9L 4x4 Trans Codes P0743, P0753, P1765

1997 5.9L Dodge Ram 1500 4X4 134,000 miles
A little history (very brief) - Last winter my the thermostat froze. I didn't realize until my heater never warmed up. I noticed the problem and was able to shut the truck off before it over heated. I replaced the thermostat and had the radiator flushed. Before I turned the truck off I noticed that the transmission was not downshifting and thought it may have been due to the sub zero weather in northern illinois. With the radiator flushed and engine not over heating, I thought the problem was fixed but the transmission was still not shifting and the GEN light started coming on. I took the truck to the dealer ship and they read the codes P0743, P0753, and P1765. They told me that they were sensor and selonoids for the transmission but said they probably failded due to low voltage caused by bad alternator output. I left and went to Autozone to have the alternator checked and they said it was good. But believing what the dealership said I bought an alternator and put it on. I went back to the dealer ship with the new alternator on and the same codes came out. THIS time the dealership said it was a bad PCM. I bought a reman PCM from Chrysler and that didn't solve the problem. I have since checked the ground leads from the battery and all seem to be good.

As a side note the GEN light doesn't stay on all of the time. It only comes on when the battery voltage gets extremely low; low enough where if I turn the truck off, it will not restart.

Has anyone heard of this problem or know if the codes are the actual problem and not a voltage problem. The dealer has managed to make me doubt what the computer is saying is wrong.

Any help or direction would be greatly appreciated.
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