coolant sensor and alarm siren codes?

2005 VOLVO XC90

144 MILES • 2.9L • 6 CYL • 4WD • AUTOMATIC

VICTORY76

MEMBER
27 POSTS
FOLLOW

I replaced the coolant level sensor installed. It a brand new but still has the message low coolant level. and the alarm siren replaced the same thing saying alarm service is required.
please help me to get rid of this situation I used my scanner to delete I but still having the problem.

Feb 1, 2023 at 7:48 AM

JACOBANDNICKOLAS

CERTIFIED EXPERT
110,175 POSTS

Hi,

Chances are you have a wiring issue or there is a problem with the connectors. By chance, could you provide me with the codes you are getting? That will help point me in the right direction for diagnostics.

Let me know.

Joe

Feb 1, 2023 at 7:09 PM

VICTORY76

MEMBER
27 POSTS

Thanks for your help, UEM- 0004 siren communication fault. but no code for coolant level just appears on messages window.

Feb 2, 2023 at 5:20 AM

JACOBANDNICKOLAS

CERTIFIED EXPERT
110,175 POSTS

Hi,

As far as the code is concerned, it is related to the upper electronic module (UEM). I attached a description below (pics 1 and 2).

The remaining pics are the diagnostics related to the UEM code. Take a look through them and let me know if you are comfortable performing them.

As far as the level sensor, did you check the connector for damage such as corrosion, a damaged connector pin, or a broken wire? With the key, disconnect the sensor and see if you have power to one of the terminals.

Let me know what you find.

Joe

See pics below.

Images (Click to enlarge)

Feb 2, 2023 at 6:38 PM