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Code P1780

Tiny
DANO1971
  • MEMBER
  • 1996 TOYOTA 4RUNNER
  • 3.4L
  • V6
  • 4WD
  • AUTOMATIC
  • 325,000 MILES
I took my car for emissions test the other day and it failed with a code p1780. The car starts the only problem with that at all. I ordered a new neutral safety switch I am going to replace that today. How can I tell before I start this if that is the problem? It is an older car and I am sure it has not been replaced in a long time and there is a lot of play in the gear shifter. Any kind of help would be appreciated. Thank you.
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Wednesday, July 5th, 2017 AT 6:51 AM

8 Replies

Tiny
DANO1971
  • MEMBER
  • 32 POSTS
On that last post I meant to put I have no problem with starting car. Also, do I need to have the car in park or in neutral safety switch?
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Wednesday, July 5th, 2017 AT 8:24 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Hello,

When replacing the switch have the car in neutral. Here are a couple of guides that will help you get the job done.

https://www.2carpros.com/articles/how-a-neutral-safety-switch-works

and

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Please let us know what happens.

Cheers, Ken
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Friday, July 7th, 2017 AT 12:03 PM
Tiny
DANO1971
  • MEMBER
  • 32 POSTS
Thanks for the help. I just got done taking off the NSS. Cleaning everything up inside of the plug and the outside of it.
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Saturday, July 8th, 2017 AT 10:50 AM
Tiny
DANO1971
  • MEMBER
  • 32 POSTS
Pu5 the new switch in. It's running better, it's shifting better, and the check engine light went out. I just hope it stays out.
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Saturday, July 8th, 2017 AT 12:06 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Good to hear, please use 2CarPros anytime we are here to help.

Cheers, Ken
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Saturday, July 8th, 2017 AT 7:47 PM
Tiny
WANGNNFNN
  • MEMBER
  • 4 POSTS
  • 2000 TOYOTA 4RUNNER
What does a toyota obd code p1780 mean?
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Saturday, July 8th, 2017 AT 7:48 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
P1780
Park/Neutral Position Switch Malfunction

That is for an automatic trans only.
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Saturday, July 8th, 2017 AT 7:48 PM (Merged)
Tiny
JINING
  • MEMBER
  • 3 POSTS
The park neutral safety switch is malfunctioning
It means you should replace your gas pedal immediately!
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Saturday, July 8th, 2017 AT 7:48 PM (Merged)

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