The transmission shifted suddenly from drive to neutral?

Tiny
BECKY UNDERWOOD
  • MEMBER
  • 2012 HYUNDAI SONATA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 140,229 MILES
The car shifted suddenly from drive to neutral doing 65 on hwy. The tachometer went all the way over then the car shut off. Pulled over did a reset by pulling fuse and disconnecting battery cable. It was hesitant but did finally start all seemed good drove about 5 to 10 miles down the road and suddenly it lost all power and shut off. Tried the reset thing again but nothing. Battery is good lights come on it turns over kind of sounds like a really dead battery, but everything comes on and now EPS light stays on. Could that effect the immobilizer.
Tuesday, January 9th, 2024 AT 2:02 PM

7 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,052 POSTS
Hi,

Is it possible for you to record it cranking and upload it for me to hear? Also, have you scanned the computer for diagnostic trouble codes?

Here is a link that explains how to scan the can-bus. You should do this to see what codes are stored.

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Let me know as much as you can.

Joe

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Tuesday, January 9th, 2024 AT 9:05 PM
Tiny
BECKY UNDERWOOD
  • MEMBER
  • 5 POSTS
If I am not mistaken I have 2 relays missing Ig 1 Ig 2. The car set on the side of road over night.
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Wednesday, January 10th, 2024 AT 9:20 AM
Tiny
BECKY UNDERWOOD
  • MEMBER
  • 5 POSTS
And now all it will do is make a clicking sound when I turn the key over.
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Wednesday, January 10th, 2024 AT 9:21 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,052 POSTS
Hi,

The starter relay is present. I don't know all the options the vehicle has, but chances are nothing is missing that is related.

When you hear the clicking, is it coming from the starter motor or a different location such as the relay? I copied your pic and highlighted the starter relay. Switch it with a different one having the same part number to see if it changes things.

Also, make sure the battery cables are tight and clean and the battery is fully charged.

Here is a link you may find helpful:

https://www.2carpros.com/articles/car-battery-load-test

Let me know.

Joe

See pic below.
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Wednesday, January 10th, 2024 AT 5:43 PM
Tiny
BECKY UNDERWOOD
  • MEMBER
  • 5 POSTS
I used a live data plus scanner and got only one code P0455 emissions.
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Thursday, January 11th, 2024 AT 2:00 PM
Tiny
BECKY UNDERWOOD
  • MEMBER
  • 5 POSTS
I will change out the relay you suggested and make sure battery is charged and cables are tight. I will get back with you ASAP.
Thank you for your help.
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Thursday, January 11th, 2024 AT 2:01 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,052 POSTS
Hi,

The code indicates a large evap leak. This is usually because the fuel cap is bad or missing, the fuel filler to the tank is faulty, or there are fuel vapor hoses off in the system.

I don't feel this would affect the transmission, but it could and would affect drivability as far as how the engine performs.

I attached two pics below. I circled or highlighted areas of interest for the leak.

Let me know what you find or if you have questions.

Take care,

Joe

See pics below.
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Thursday, January 11th, 2024 AT 8:14 PM

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