Error message "reduced transmission performance"

Tiny
ANT0606
  • MEMBER
  • 2014 VOLVO V40
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 49,000 MILES
Car was serviced about a month ago at the dealer. Had no problems whatsoever. Just got in the car and the error displayed “reduced transmission performance“: V40 T4 Car does not shift gears, high revs. Switched it off and back on again. Error message was off and gears changed but gear shifted not smoothly and jerky. Revs are also still higher than usual.
Thursday, August 9th, 2018 AT 5:22 AM

7 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,574 POSTS
Hello,

This sounds like you have a transmission turbine sensor that has gone out or is not reading correctly. Lets run the codes first to see what comes up.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Here is the location of the sensor (below).

Please run down these guides and report back.

Cheers, Ken
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Friday, August 10th, 2018 AT 12:44 PM
Tiny
ANT0606
  • MEMBER
  • 3 POSTS
Hi, Volvo dealership just informed me that the transmission seals have to be replaced. Gearbox to be taken out and I am without a car for four to five days.
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Monday, August 13th, 2018 AT 3:50 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,574 POSTS
49,000 miles that is a little premature. Did they say how much it will cost?
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Monday, August 13th, 2018 AT 1:15 PM
Tiny
ANT0606
  • MEMBER
  • 3 POSTS
Car is still under maintenance plan. Will know cost when I collect it.
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Tuesday, August 14th, 2018 AT 12:56 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,574 POSTS
Well that is good, let me know what happens. :)
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Tuesday, August 14th, 2018 AT 10:38 AM
Tiny
LOONEYRAY
  • MEMBER
  • 1 POST
I’m have the same problem, did you manage to get it fixed?
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Tuesday, September 20th, 2022 AT 6:05 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,574 POSTS
They never got back to us on this problem unfortunately, but we can pick it up and find a solution. It sounded link a turbine sensor to me, but we should run a CAN scan to see what codes come up, it is easy to do. You can get a CAN scanner (Controller Area Network) from Amazon for about $36.00.

Here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

Here is a scanner link:

https://amzn.to/3eCqWWw

Please let me know what happens.
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Thursday, September 22nd, 2022 AT 11:13 AM

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