Loud noise coming from the transmission?

Tiny
TROY BACHNNALIST
  • MEMBER
  • 2014 SUBARU IMPREZA
  • 4WD
  • AUTOMATIC
  • 144,890 MILES
I pulled into a parking lot and another driver ran into my back. The damage did not seem to be as extensive, however, when I started the vehicle later that day there was a loud noise coming from the transmission area when I accelerated. The vehicle drove at less than 2mph and it just would go forward after that. Can someone explain what might have been the issue?
Thursday, February 6th, 2025 AT 12:00 PM

8 Replies

Tiny
CARDOCTOR74
  • MECHANIC
  • 55 POSTS
It really depends how hard you hit in the back and if anything, shifted and damaged, the transmission on the harness. I’m sure there is a check engine light on as well. The first thing I would do is have it scanned, which would then tell us what code is stored and what’s failing. I would also make sure you have pictures of the damage the other owner's information and I would have it up on a lift to see if there’s anything leaking or damaged as well. Once you have that information, please report back. I’ll be more than happy to help you.
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Thursday, February 6th, 2025 AT 12:06 PM
Tiny
TROY BACHNNALIST
  • MEMBER
  • 4 POSTS
When the computer was placed on the vehicle it read 1) tcm transmission 2) and brake control, ES eyesight. The codes were C0071-5127 and PO841.
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Thursday, February 6th, 2025 AT 12:20 PM
Tiny
CARDOCTOR74
  • MECHANIC
  • 55 POSTS
What year is the Subaru?
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Thursday, February 6th, 2025 AT 12:33 PM
Tiny
TROY BACHNNALIST
  • MEMBER
  • 4 POSTS
2014
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Thursday, February 6th, 2025 AT 12:56 PM
Tiny
CARDOCTOR74
  • MECHANIC
  • 55 POSTS
So what happened is when you got in the accident when you got hit in the back it most likely jolted everything and possibly damaged the oil sensor in the transmission. That’s what that code is for. I’ve attached the flow chart for you to see how it operates and what could be the cause of that code any issue you are having. But I do hope you still have a police report and insurance information as this is going to need to be covered under insurance, either a complete transmission removal and repair and replacement or just the sensor has failed over the wiring. I’ve attached a link for you to follow to understand what needs to be done.

https://static.nhtsa.gov/odi/tsbs/2016/MC-10111091-9999.pdf
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Thursday, February 6th, 2025 AT 1:25 PM
Tiny
CARDOCTOR74
  • MECHANIC
  • 55 POSTS
Very glad to help.

https://www.2carpros.com/questions/abs-light-and-traction-control-light-on-dash

If you found this helpful, I would not object to a tip lol. I’m here if you need me.

https://venmo.com/u/hondaguygold
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Friday, February 7th, 2025 AT 11:13 AM
Tiny
TROY BACHNNALIST
  • MEMBER
  • 4 POSTS
I sure wouldn’t mind tipping, let me know how can it be done.
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Friday, February 7th, 2025 AT 11:17 AM
Tiny
CARDOCTOR74
  • MECHANIC
  • 55 POSTS
Just click the Venmo link above. Thanks again for using 2CarPros.
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Friday, February 7th, 2025 AT 11:21 AM

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