The "Start Stop Service Required" message in your Volvo XC90 can be concerning, especially for drivers who rely on the vehicle's efficiency features. This guide provides essential information on what this message means, potential causes, and solutions.

Understanding the Start/Stop Function

The Start/Stop function is designed to enhance fuel efficiency by automatically turning off the engine when the vehicle comes to a complete stop, such as at traffic lights. The engine restarts when the driver releases the brake pedal. This system relies on two batteries: the main battery and a smaller support battery, specifically for the Start/Stop feature.

Common Causes of the Warning

  • Support Battery Issues: A depleted or faulty support battery is often the root cause of the "Start Stop Service Required" message. This battery can fail due to age or insufficient charging, particularly if the vehicle is used primarily for short trips.

  • Software Glitches: Sometimes, software issues can trigger this warning, requiring a reset or update from a dealership.

  • Environmental Conditions: The Start/Stop function may not activate under certain conditions, such as extreme temperatures or when various electrical systems are in use.

Solutions to Address the Message

1. Check and Replace the Support Battery:

- The support battery is typically located under the front cowl. If it's testing low or showing signs of failure, replacing it is often necessary.

- Ensure that you use an OEM (Original Equipment Manufacturer) battery to avoid compatibility issues.

2. Perform a System Reset:

- After replacing the support battery, disconnect both batteries (main and support) for at least 15 minutes to allow the vehicle's systems to reset. This can often clear persistent warning messages.

- Reconnect the batteries in the correct order (positive first, then negative).

3. Visit a Volvo Dealer or Qualified Mechanic:

- If replacing the battery and resetting does not resolve the issue, it may be necessary to have a diagnostic scan performed to identify any underlying problems with software or other components.

Important Considerations

  • Battery Maintenance: Regularly check both batteries' health, especially if you frequently drive short distances. Consider using a trickle charger if your vehicle sits unused for extended periods.

  • Driving Habits: The Start/Stop feature may not operate effectively if driving habits do not allow for proper battery charging. Longer drives can help maintain battery health.

  • Environmental Factors: Be aware that extreme temperatures (below -4.5°C or above 30.5°C) can inhibit the Start/Stop function from engaging.

FAQs About Start Stop Service Required

    • What should I do if my warning light remains on after replacing the support battery?
      If the light persists, perform a system reset by disconnecting both batteries for 15 minutes and reconnecting them.
    • Can I disable the Start/Stop feature?
      Yes, you can disable it through your vehicle's settings or by using specific driving modes.
    • How often should I check my support battery?
      It's advisable to check it at least once a year, especially if you notice any performance issues.