Autopapyrus · Volvo XC90 (2nd generation)
https://autopapyrus.com/guides/volvo/xc90/registering-a-new-battery-and-clearing-fault-codes-with-a-scan-tool/

Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Volvo XC90 (2nd generation): Registering a New Battery and Clearing Fault Codes with a Scan Tool

A vehicle with a Start/Stop system and intelligent charging control monitors battery wear. After replacement, you need to reset the old battery's statistics in the power management module and enter the new battery's data. Otherwise the battery is charged with the wrong algorithm, it ages faster, and warnings may remain on the instrument cluster. The exact menu items depend on the scan tool and its software version, so the general procedure is given below.

Difficulty: Medium Time: 20-40 minutes Steps: 11 Tools: Diagnostic scan tool with Volvo support (CAN, access to the CEM/BCM modules and the power management system), battery charger or regulated 12 V power supply to maintain voltage, 10 mm wrench for the terminals

Part

🔩 Battery of the same technology and capacity as the factory original (AGM or EFB, usually 70-80 Ah; check the label on the old battery for exact specifications)

There's a full repair manual for this car Every system, wiring diagrams and torque specs — not just this job. Haynes and 4 more. See manuals →

Step by step

11 steps

Before disconnecting the old battery, close all doors and turn off the ignition and all electrical loads. Connect a battery charger or a 12 V regulated power supply (electrical system support) so the modules don't lose power during the replacement.
Remove the negative terminal first, then the positive, and then replace the battery. Install the new one and connect the positive first, then the negative. Tighten the terminals without excessive force.
Turn the ignition on and wait 1-2 minutes. After the power loss, the power windows may not work in "auto" mode, and the clock and settings will reset. This is normal.
Connect the scan tool to the OBD-II diagnostic port under the dash on the driver's left. Select Volvo, XC90, 2020 (SPA platform). Turn the ignition on without starting the engine.
In the menu, find the service function "Battery replacement / Battery registration" in the maintenance section or in the power management module/CEM.
Enter the new battery's parameters: type (AGM or EFB), capacity in Ah and, if prompted, the serial number or the code from the battery case. The values must match the label on the installed battery.
Confirm the write and wait for the message that the procedure completed successfully. Turn the ignition off and wait for the car to go to sleep (a few minutes).
Turn the ignition on again and read the fault memory of all modules (not just the engine). After a battery replacement, low-voltage messages typically appear in various modules. These are false stored codes.
Clear the fault codes in all modules, then scan again. If the codes return, it is a current fault. Check the terminal connections, the ground, and the alternator charging output (with the engine running, voltage is usually 13.8-14.8 V).
Start the engine and check that the warnings on the instrument cluster have gone out, and that Start/Stop and the radio, navigation and cameras work normally. If necessary, set the time and other user settings again.
Take a 10-15 minute test drive and check the fault memory once more.

Common mistakes and warnings

Do not install a battery of a different technology or a noticeably different capacity than the factory one without recoding: the charging system is designed for a specific type. Do not disconnect the terminals while the engine is running. If your scan tool does not have a battery registration function for Volvo, or if faults remain after registration, take the car to a specialist repair shop with Volvo diagnostics, since registration is done with specialized equipment.