Drive indicator in the panel turning off?

2002 HONDA CIVIC
120 MILES • 1.6L • 4 CYL • 2WD • AUTOMATIC
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SIMARUN08
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I encountered it maybe 10 times when i was driving at D, the indicator in the panel showing the letter D in green light suddenly turn off and the engine will be in neutral. A slight movement in the shift stick will make it back to normal.

Or sometimes when i move the stick from N to D, the D light will turn off too, and a slight move or shake of the shift stick will turn it on.

When the D light in the panel turned off, the car will not move like it is in neutral.
Jan 16, 2024 at 2:54 PM
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BORIS K
  • Experienced Mechanic
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Hello,

It sounds like you might have an issue with the transmission range sensor.
This sensor, located at the end of the transmission towards the right front wheel, sends the transmission gear position to the system. On occasion it can also cause a non start as the neutral or park position is not being seen.

A good video on how to replace:
https://youtu.be/i5g7dHh99dI?si=lNQ6XDHYMSkiqjV8

Hope this helps.

Cheers, Boris
Jan 16, 2024 at 7:40 PM
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SIMARUN08
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Oh yes, thank you Boris. Can this also be the culprit of the following:
1. Sometimes it can be started at N, sometimes it doesn't.
2. Had notice that sometimes during acceleration (around 60kph) it suddenly downshift.
3. There were instance at shifting from 1st to 2nd gear, around 2000rpm, there was a slight shift shock or shudder felt.
Thank you so much.
Jan 17, 2024 at 7:22 AM
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BORIS K
  • Experienced Mechanic
  • 836 POSTS
Hello,

The symptoms listed by you could also be caused by a faulty transmission range sensor.

Cheers, Boris
Jan 17, 2024 at 5:19 PM
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SIMARUN08
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Thank you so much for this. I'll have it check the soonest.
Jan 18, 2024 at 7:25 AM
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SIMARUN08
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Hi. I have replaced the sensor already and symtoms i mentioned are gone. Thank you.
I just noticed that the shifting time is adjusted, it usually shifts from 1st to 2nd at 2,000 RPMs. Now it is at 2,200 RPMs. Will the position affect the shifting? I mean you can install the sensor, but it is not snug fit. It can be lean a little to the left or right as the hole for its 2 bolt are not circle, they are oblong.
Jan 31, 2024 at 1:43 PM
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SIMARUN08
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This bolt hole make the sensor move a little when installing.
Jan 31, 2024 at 3:29 PM
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BORIS K
  • Experienced Mechanic
  • 836 POSTS
Hello,

The transmission range sensor must be installed with the transmission set in Neutral.
On the range sensor there are alignment notches which must line up, see image below.
With the switch installed ensure that the 4 notches make a straight line with the transmission in neutral.

A good video:
https://youtu.be/i5g7dHh99dI?si=IEfF82PtHk1MkX1R

Cheers, Boris
Jan 31, 2024 at 9:38 PM
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SIMARUN08
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Yes, all instructions are followed and are now in very good condition except that the shifting from 1st gear to 2nd gear changes after i replace the range sensor. Just wondering if this has something to do with this.
Before replacement: 1st gear to 2nd is at 2,000 RPMs.
After replacement: 1st gear to 2nd is at 2,200 RPMs.
Thank you, will observe it more.
Feb 1, 2024 at 7:20 AM
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BORIS K
  • Experienced Mechanic
  • 836 POSTS
Hello,

If the new sensor has been installed correctly, I can only assume that a difference in internal resistance could cause this shifting difference.
The range sensor uses a bunch of resistors which it uses to determine the transmission position.
See images below of internals for the range sensor.

Cheers, Boris
Feb 1, 2024 at 6:18 PM
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SIMARUN08
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Thank you so much.
Feb 2, 2024 at 8:02 AM
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BORIS K
  • Experienced Mechanic
  • 836 POSTS
Thank you for using 2CarPros.

Please let us know if you have any more queries.

Cheers, Boris
Feb 4, 2024 at 4:39 PM
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