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Transmission defaults into second and my check engine light turns on?

Tiny
NCOOP
  • MEMBER
  • 2011 MITSUBISHI GALANT
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
The drive and neutral lights flash. When checking the code, it says that it is the transmission input speed sensor. If I clear the code the car drives fine until it comes back on. We have replaced both the input and output speed sensors, and we have checked for leaks or damage but nothing. The fluid is full but does need to be changed. What else could cause these issues? With trying different things to fix it the car has been driven some. Sometimes for several smaller trips with no issues and sometimes it will have the same issue several times before going around a city block.

What can we do next to try and diagnose/fix the problem?
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Sunday, December 4th, 2022 AT 8:59 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Hi,

If you have replaced the sensors and there has been no change, chances are we have a poor connection either in a connector or a damaged wire in the harness. That would explain the length of time differences as to when it happens.

Here is what I need. Let me know what specific code was retrieved. If I have that, I can read the exact definition and determine what may be causing the issue.

Let me know.

Joe
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Monday, December 5th, 2022 AT 6:22 PM
Tiny
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  • MEMBER
  • 2 POSTS
The code reader shows "P0715 Input/Turbine Speed Sensor A Circuit".
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Monday, December 5th, 2022 AT 9:17 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Hi,

Okay, if the sensor was replaced with no change, there is likely a wiring issue.

I attached the diagnostics for the code / checking the input speed sensor (ISS). Take a look through them and let me know if it is something you are comfortable performing.

Take care,

Joe

See pics below.
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Tuesday, December 6th, 2022 AT 2:19 PM

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