I was cleaning some old papers from under the counter for way too long and found an old scan report for this Cadillac. I found it interesting that even though I don't remember the particular car, I do have enough familiarity with them that I can pretty well guess what was found wrong by looking at the stored engine codes. I can even see that the codes had been cleared and had all returned after failing tests yet again. The same seven codes were cleared, stored as history and returned as failed since cleared.
The P0101, P0171, P0174 and P0300 were mostly likely from a vacuum leak. The vacuum leak was commonly a bad spacer tube between the intake manifold and the throttle base mount. I actually replaced one of those a few days ago on a 2004 model.
That would leave the U1064 and U1096 as likely a bad ground issue. The battery on these is under the rear seat inside the car. The negative cable connects from the battery to the car body. A short ground cable at the alternator connects to the body and allows for engine ground. Usually the problem is a poor connection at that cable near the alternator.
The P0340 is a code that I would wait and see if it appeared again after the previous repairs. The code could have been related to the poor ground. If it returned the sensor is not hard to get to for inspection or testing.
Thanks for reading!
Kenny@ggauto.repair
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