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Old 11-07-2021, 05:41 PM #1
alohaimmatt alohaimmatt is offline
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P1780 won't shift out of first gear

Hi all,

I've had my 2000 Limited Auto for about 5 months now. Yesterday I took it to go shooting in the bush, I filled up on gas and noticed my dash fuel level was only reading half full. I did a bit of off-roading to get to our shooting spot for the first time since owning the truck. Afterwards when I left and got back on the highway I noticed that even when in Drive my reverse bulb was turned on.

I pulled over to the side of the road and turned the truck off and on again. Once I did this the truck was stuck in 1st gear. I drove it back ~150km in 1st gear keeping the RPMs around 4,000.

I scanned for codes and got a P1780. Clearing the codes did nothing as they immediately came back. I disconnected the battery for 10 minutes, re-connected it and the CEL went away. However the truck would still stay in 1st gear.

I read through this forum post below, where the dash printed circuit board was replaced. I just removed my cluster and tried to drive the truck with no cluster, same issue no shifting.

p1780 cel park neutral switch error with erratic dash indicator lights

I took apart the PCB and it looked okay nothing super obviously wrong. I did notice this one spot however, notice how the connection does not go into the white area. All others (see to the right) do, this position is for the reverse light. Coincidence?



I inspected the Neutral Safety Switch, the connection seemed fine. There was a good amount of dielectric grease which I cleaned up but nothing changed. I attempted to remove the NSS itself however after disconnecting the 21mm nut and washer I struggled to pry it off so I just left it on. I have ordered a new NSS from RockAuto which should arrive this Friday, hopefully I'll have the old one off by then.

I did also read through this forum post below, however my speedometer continues to work so I don't think it's the VSS.

Panic mode, tranny won't up shift.

The car has a good ATF level, the previous owner did install an aftermarket navigation unit. They also put in LED head lights, the DRLs are always on no matter the position on the indicator.

Any ideas on what to check next? Get a used cluster from a wrecker and pop it in? Wait for the new NSS? Thanks.
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Old 01-15-2022, 12:58 PM #2
sk4runner sk4runner is offline
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Hello,

Were you able to resolve this issue? I am having the identical problem with my 2002 4Runner. Any advice would be appreciated.

Regards, Brent.
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Old 01-15-2022, 03:22 PM #3
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Originally Posted by sk4runner View Post
Hello,

Were you able to resolve this issue? I am having the identical problem with my 2002 4Runner. Any advice would be appreciated.

Regards, Brent.
Rear brake light wiring has been known to cause some of these issues. All three brake lights working. Trailer wiring harness good. Brake light wiring good.
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