Neutral safety switch replacement instructions please?

Tiny
SANDOR 26
  • MEMBER
  • 2004 DODGE NEON
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 161,760 MILES
I drove the car to a friends house and parked in a driveway that has a upward slope. When means when it rains the water goes down towards the road. The car sat 6 hours and went to start the engine nothing happened, but when I put the shift lever in neutral the engine started up. What is causing the problem?
Saturday, September 21st, 2019 AT 4:10 PM

9 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Welcome to 2CarPros.

One of two things is happening. The most common problem is what is called a neutral safety switch. It only allows the vehicle to be started in park or neutral. On your vehicle, that operation is done by what is called a transmission range sensor. To replace it requires the removal of the valve body located in the transmission. On the other hand, if you were on a very steep incline, there is a possibility that the shift cable linkage may be off if it was difficult to remove from park.

Since the range sensor is much more difficult to replace, lets start by adjusting the shift cable. Here are the directions specific to your vehicle. The attached pics correlate with the directions. Since this doesn't cost anything, I feel it is a good thing to start with.

GEARSHIFT CABLE
Normal operation of the Park/Neutral Position Switch provides a quick check to confirm proper linkage adjustment. The engine starter should only operate when the transaxle shift lever is in the PARK (P) or NEUTRAL (N) positions. If the engine starts in any other gear position, or the vehicle rolls when the shifter is in gated PARK (P), a gearshift cable adjustment is necessary.

ADJUSTMENT
1. Loosen set screw and remove knob from shifter handle (Fig. 189).
2. Remove the center console assembly as shown in (Fig. 190).
3. Adjust gearshift cable as follows:
a. Place gearshift lever in the PARK (P) position.
B. Loosen shift cable adjustment screw (Fig. 191).
C. Move transaxle manual lever to the PARK. Verify transaxle is in PARK by attempting to roll vehicle in either direction.
D. Tighten shift cable adjustment screw to 8 Nm (70 inch lbs.) Torque.
4. Verify proper cable adjustment. Engine should start with the shifter lever in PARK (P) and NEUTRAL (N) positions ONLY.
5. Install center console assembly (Fig. 190).
6. Install gearshift knob and tighten set screw to 2 Nm (15 inch lbs.) Torque (Fig. 189).

Check out the diagrams (Below). Please let us know what happens.
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Thursday, April 15th, 2021 AT 6:48 PM
Tiny
SANDOR 26
  • MEMBER
  • 9 POSTS
The neutral safety switch was faulty and the shift was adjusted. Thank you for the information.
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Thursday, April 15th, 2021 AT 6:48 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Welcome back:

You are very welcome. Let us know if we can help in the future. Also, was it both that were the problem? I always tell family members to first apply the parking brake so it holds the vehicle and then shift to park. That way, the tension is not on the parking sprag in the transmission. Also, it avoids having difficulty when removing the vehicle from park. When they are on a hill, it can put a lot of pressure on things.

Let me know if it was both or only one, and take care.

Joe
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Thursday, April 15th, 2021 AT 6:48 PM
Tiny
SANDOR 26
  • MEMBER
  • 9 POSTS
When the transmission was hot, it was hard to move the shift through all gears and easy when it was sitting overnight. The cable was adjusted to specifications and sprayed the linkage with WD40 and helped a lot.
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Thursday, April 15th, 2021 AT 6:48 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Welcome back:

Thanks for letting me know. When things such as metal get hot, they expand, so I'm sure the WD40 helped.

Take care and let is know if you have questions in the future.

Joe
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Thursday, April 15th, 2021 AT 6:48 PM
Tiny
SANDOR 26
  • MEMBER
  • 9 POSTS
Is it possible for a rear brake to burst with a tear letting all the brake fluid out or did someone try to cut the hose when the car was parked? The master cylinder was replaced because the seal was starting to leak. The brake pedal felt spongy when I applied the brake, when I arrived at the garage the pedal went to the floor and the fluid was over the place. What do think happened? Was the brake hose defective or cut half way? There were no problems the day before.
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Thursday, April 15th, 2021 AT 6:48 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Welcome back:

I attached two pics below for you to see. You have either a drum brake or disc brake system on the rear. Both have a rubber flex brake line. I circled and highlighted both. The think is this. Could someone have cut it? It is possible, but they can burst due to age and condition. If you could upload a pic of it, I may be able to help better. As far as someone doing it, I have no idea where you are located to. However, don't be alarmed because it is possible that it failed. One last thought. A spongy pedal may have indicated it was expanding when you hit the brakes. It shouldn't do that and would lead to it bursting.

Let me know if I can help.

Joe
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Thursday, April 15th, 2021 AT 6:48 PM
Tiny
SANDOR 26
  • MEMBER
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The rear back right drum brake and the hose was new or was the brake hose defective. If this helps.
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Thursday, April 15th, 2021 AT 6:48 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Welcome back:

Can you upload a picture of the damaged line? Also, a new one can be bad as well.

Let me know.

Joe
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Thursday, April 15th, 2021 AT 6:48 PM

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