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Discussion Starter · #1 ·
Honda passport 2000 4L30E transmission.
Check trans light will come on flashing when switching from 3rd to 4th gear, also I noticed that the rpm will go over 3500 before it shifts into 4th gear and the speed is between 70-80mph. When I stop the car, turn off the engine for few seconds and start again the check trans light will turn off. Check trans light always comes on flashing 3rd to 4th at about 3500rpm.
Tried to read the DTC codes with Actron OBDII, reading link error.
Have changed transmisson fluid and filter, problem still remains the same.
Checked the batery voltage, alternator, transmission mode switch, B
+, GND to PCM. Everything looks ok. Is it possible that my PCM is bad?

Any suggestion.
 

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how many miles?

What type of x fluid did you use?

Range sensor cleaned??
 

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Discussion Starter · #3 ·
83000 miles. I used dextron III G. I had a problem with range sensor when it had 60000 miles on odometer, it's been replaced. Range sensor indication looks good it indicates proper gear.
Have a hard time to figure out this problem now.
 

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Drive it to the parts store and have your alternator checked. Your electronically controlled tranny will do funny things if it doesn't get it's proper voltage.

Your alternator could be going.

Joe
 
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