Question about 2001 Mercury Cougar

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Ok one major question! Will changing the tcc solenoid in my 01 cougar fix the o/d flashing and make the car go forward when I try to drive it?

P1744 & P0720 which is the best route to fix this

Posted by Mike on

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2 Answers

Randy Ohler

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  • Mercury Master
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No. replacing the TCC or the OSS, will not make the transmission work. You can unplug these transmissions and they will still work, less OD. Sounds like you may have stripped the torque converter oil pump gear. Common in these older Mercury/Fords.

Posted on Mar 18, 2016

  • Mike Mar 18, 2016

    Thanks forvthe reply. So what should i do?

  • Randy Ohler Mar 18, 2016

    When you start it up. It will make a whining noise. When reved up the pitch will get higher. This is the transmission pump rod spinning in the converter. I know the sound. But there are other parts that can make the same sound. I use a stethoscope to locate the sound. If it is up at the engine /transmission mounting, it is the converter. Further back is usually planetary gears. Either way the transmission has to come out. Once out drain the converter. Hold it on it's side and look in the hole at the back. You will see the washer/gear is stripped. replace the converter. Many times you can get extra life from the transmission. If it were mine and I wanted to keep it(the rest of the car is good) I would rebuild the transmission also. But,I rebuild them. Cost to have it built, About $1300+, you pull it and put it back in.

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Jeff Armer

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P0720 - Insufficient input from Output Shaft Speed sensor The output shaft speed sensor inputs a signal to the PCM, based on the speed of the output shaft of the transmission. The PCM compares this signal with the signal of the VSS or TCSS and determines correct tire size and axle gear ratio.

  • OSS sensor circuit short to GND
  • OSS sensor circuit short to PWR
  • OSS sensor circuit open
  • Damaged OSS sensor
  • Damaged PCM
Verify sensor signal output varies with vehicle speed.

Posted on Mar 18, 2016

Testimonial: "So what can i do to correct this and do i need a new transmission?"

  • 2 more comments 
  • Jeff Armer Mar 18, 2016

    P1744 TCC TCC The PCM picked up an excessive amount of TCC slippage during normal vehicle operation. TCC slippage/erratic or no torque converter clutch operation. GO to Diagnosis by Symptom. The P0720 is the concern i would address first . But both codes sould be diagnosed before replacing parts . You best bet is to take to a transmission repair shop that has the diagnostic tool to fix it. The codes do not suggest replacing parts , testing the cicuity ,electrical inputs to the control modules etc..

  • Jeff Armer Mar 18, 2016

    Do you know how to test electrical circuits ? An you would need a diagnostic flow chart . No you do not need a new transmission . At most a couple of sensors or wiring repair or a contorl module .

  • Jeff Armer Mar 18, 2016

    https://youtu.be/PW_hmDhJAVk

  • Jeff Armer Mar 18, 2016

    watch the you tube video

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