Error message "reduced transmission performance"

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.

7 Replies

KEN L

MASTER CERTIFIED MECHANIC
42,960 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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Tuesday, August 14th, 2018 AT 10:38 AM

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

KEN L

MASTER CERTIFIED MECHANIC
42,960 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