Failing Transaxle or PCM? - Taurus Car Club of America : Ford Taurus Forum
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post #1 of 49 (permalink) Old 06-08-2019, 08:46 AM Thread Starter
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Failing Transaxle or PCM?

Yesterday, my 2000 DOHC Taurus (202,232 miles) threw a series of codes: P0743, P0750, P0760, P1451, P0135, P0141, P0155, P0161, and P0755. Additionally, the check transaxle light came on. The air conditioner, which had been working extremely well, seemed to stop cooling.

Since the codes involve the transaxle, oxygen sensors, and air conditioner, could the explanation be that the PCM is failing? The engine still runs well and the car is drivable. The car has been very well maintained.
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post #2 of 49 (permalink) Old 06-08-2019, 09:12 AM
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PCMs usually don't fail, but people want to believe they do. Did all those code come up at once? Check your grounds and make sure PCM connector is tight.
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post #3 of 49 (permalink) Old 06-08-2019, 09:30 AM Thread Starter
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All of the codes came up at once.
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post #4 of 49 (permalink) Old 06-08-2019, 11:50 AM Thread Starter
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I dropped and cleaned the pan, replaced the filter, and refilled with either Amsoil or Mobil 1 ATF every 25,000 miles. Do you think if I had done a complete transmission fluid change the Amsoil way the transaxle would have lasted longer? How long do most of these transmissions last?
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post #5 of 49 (permalink) Old 06-08-2019, 12:00 PM
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I agree with Automender, sounds like a ground issue. Check and clean where the negative cable grounds to the body, also where the body grounds to the engine. Use dielectric grease when you remount them.
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post #6 of 49 (permalink) Old 06-08-2019, 12:14 PM Thread Starter
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I cleaned and applied dielectric grease to the PCM ground and where the negative battery cable ground connects to the body in the last two months. Are you referring to the braided grounding strap between the body and the engine?

Last edited by topgunovrtx; 06-08-2019 at 12:39 PM.
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post #7 of 49 (permalink) Old 06-08-2019, 12:28 PM
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Quote:
Originally Posted by topgunovrtx View Post
I dropped and cleaned the pan, replaced the filter, and refilled with either Amsoil or Mobil 1 ATF every 25,000 miles. Do you think if I had done a complete transmission fluid change the Amsoil way the transaxle would have lasted longer? How long do most of these transmissions last?

My understanding is that only a transmission fluid labeled as MerconV should be used actually. Not saying that it caused any issues, hopefully it didn't of course.
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post #8 of 49 (permalink) Old 06-08-2019, 12:36 PM Thread Starter
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It was Mercon V.
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post #9 of 49 (permalink) Old 06-08-2019, 01:01 PM Thread Starter
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Where is the body to engine ground you are referring to?
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post #10 of 49 (permalink) Old 06-08-2019, 02:22 PM
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^ Same location as the pcm ground. Yes, braided strap.
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