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2020 XC60 T5 - Start/Stop System Service Required Message

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Christine P. · rep 0 · May 22, 5:13 AM · 1 replies · solved · Question

Vehicle: 2020 Volvo XC60 T5 Momentum

Hey everyone,

I've been getting a persistent 'Start/Stop System Service Required' message on my 2020 Volvo XC60 T5 Momentum. It started a few weeks ago, and now the auto start/stop function rarely works, even on longer drives. The car otherwise seems to run fine, but this message is annoying.

I've checked the battery terminals, and they seem clean and tight. I mostly do short commutes, but I've taken it on a couple of longer trips recently, hoping it would clear up, but no luck. Has anyone else experienced this with their XC60 or a similar Volvo model year?

Could it be the main 12V battery, or is there a separate auxiliary battery for the start/stop system that might be failing? Any advice on what I should check before taking it to the dealer would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:13 AM

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ClearTheCode admin answer:

The 'Start/Stop System Service Required' message in your 2020 Volvo XC60 T5 is a common issue, often related to the vehicle's 12V battery system. The start/stop function is highly sensitive to battery health and charge levels.

Here are the common causes and steps you can take:

  1. Weak 12V Main Battery: The most frequent cause. Even if your car starts fine, the main 12V battery might not have sufficient charge or capacity to reliably support the start/stop system. The system requires a high state of charge and good battery health to operate. Short commutes can prevent the battery from fully charging.
  2. Auxiliary Battery (if equipped): Some Volvo models, especially those with more complex electrical systems or older start/stop designs, may have a smaller auxiliary battery specifically for the start/stop function. If present, this battery can degrade independently of the main battery. However, newer Volvos often rely solely on the main 12V battery and a robust Battery Management System (BMS).
  3. Battery Management System (BMS) Sensor: The BMS monitors the battery's state of charge, temperature, and health. A fault in this sensor or its wiring can lead to incorrect readings, causing the system to disable start/stop.
  4. Software Glitch: Less common, but sometimes a software update or a hard reset (disconnecting the battery for 15-30 minutes, then reconnecting) can resolve minor electronic glitches.

Diagnostics & When to See a Shop:

  • Check Battery Voltage: Use a multimeter to check your 12V battery's voltage after the car has been off for several hours. A healthy battery should read around 12.6V. If it's consistently below 12.4V, it might be undercharged or weakening.
  • Battery Load Test: A professional battery load test is the best way to determine the battery's true health. Most auto parts stores offer this service for free.
  • OBD-II Scan: While a generic OBD-II scanner might not always show specific Volvo-related codes for this issue, it's worth checking for codes like P0562 (System Voltage Low) or P0563 (System Voltage High), which could indicate charging system or battery issues. Volvo-specific diagnostic tools (like VIDA) would provide more detailed fault codes related to the BMS or start/stop module.

Recommendation: Given the persistent nature of the message, it's highly probable that your main 12V battery is either weak or not fully charged. We recommend having your battery professionally tested. If the battery tests good, then it's time to visit a Volvo service center. They can perform a deeper diagnostic scan using their specialized tools to pinpoint if it's a BMS sensor, auxiliary battery (if applicable), or another electrical component causing the issue.

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