4l80e hard shifting
Thread Starter
Staging Lane
Joined: May 2010
Posts: 52
Likes: 0
4l80e hard shifting I hope someone can help..I have a 86c10 with a lq4/4l80 and after the tranny is warmed up it shifts very hard in every gear...it has always done this, its a PSI Conversions pcm and harness. I have tried switching the ISS and VSS sensors around, checked the trans harness plug, not sure what to look for?...I do not have the wire for the park/neutral ground hooked up to the neutral safety switch because mine only has the single plug for the back up lights.....it keeps throwing this code...
Teching In
Joined: Feb 2013
Posts: 2
Likes: 0
not an expert but i think thats your input speed sensor to the trans, it senses the speed the cranks spinning not the output speed. you need a real time scanner to make sure the sensor is reading correctly or reading at all. my car did the same hard shifting till i had the sensor hooked up correctly.
- Faulty Transmission Speed Sensor
- Transmission Speed Sensor harness is open or shorted
- Transmission Speed Sensor circuit poor electrical connection
Some check points.............
- Transmission Speed Sensor harness is open or shorted
- Transmission Speed Sensor circuit poor electrical connection
Some check points.............
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