Question about 1999 Cadillac DeVille

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Have a 99 cadillac deville that will shift fine when you first take off but after you stop will not shift pass second gear. If you stop completely and put it in park it will shift through all the gears again or while driving clear the codes with a scan tool. The codes that show up are:P0758,P1350,and P1375. The service engine soon, abs and traction control lights are on also. Replaced solenoids in transmission,and ignition switch under dash didnt fix the problem. Took it to dealer they wanted to replace the ebtcm and pmv for $2300. Should I replace the ICM for codes P1350,P1375, and what do you think is causing it not to shift.

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The powertrain control module (PCM) doesn't like the information it is getting from the ignition control module (ICM), and the PCM controls shifting, traction control, etc.If these are the only codes you are getting and the car moves, then you could assume the sensors connected to the ICM are working properly. That leaves why the PCM thinks there is a problem. I would certainly replace the ICM first, and then if the problem still exists, the PCM.

Posted on Mar 02, 2015

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Posted on Jan 02, 2017

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