Hello. Any help would be much appreciated.

The temp display in my 2019 V90 is completely wrong about 50% of the time. It will show minus 4 degrees when it clearly mid twenties outside.

Diagnostic testing stated: Ambient air temp sensor signal too low.

The alleged Volvo expert wasn’t entirely sure what the next steps would be. They suggested replacing the “door harness” as a start but couldn’t guarantee a fix for the £300 quote. It was just their first suggestion of what could be a large rabbit hole.

Has anyone else had a similar issue? Would anyone agree with the door harness suggestion?

Thanks.

 

Did your volvo expert test the sensor on both sides of the wiring harness? Asking for similar experiences doesn't make any sense since the root cause could be the sensor, the wirings, the connectors, a ground point or another device such as a relay etc that's common to the circuit path back to the DIM. I think what the tech is saying is that they won't know the root cause until they do further testing beyond a computer scan. They may pop off a door card and see a pinched wire, a loose connection etc - but they won't know until they start exploring.

 

thank you

 

The sensor itself can be tested, my guess is, if it works sometimes and not others, there is a bad connection/corrosion somewhere. I'd start at the sensor itself.