It was a typical Monday morning when I first noticed something wasn’t right with my 2016 Volvo V70 D4. As I waited at the traffic light, I realized the stop/start function wasn’t engaging as it normally would. For those unfamiliar with this feature, it’s designed to save fuel by automatically shutting off the engine when you come to a complete stop, then seamlessly restarting when you release the brake pedal.
At first, I didn’t think much of it. “Maybe it’s just too cold today,” I thought. But as the week progressed and temperatures rose, the problem persisted. Then came the warning I dreaded – the amber battery icon illuminated on my dashboard with the ominous message “Low Battery. Start Engine.”
This was concerning for two reasons: first, my Volvo was relatively young at just six years old, and second, I had replaced the battery only last year. Something didn’t add up.
The Dealer Dilemma
My first instinct was to call the Volvo dealership. The service advisor was friendly enough, but his response wasn’t what I hoped to hear.
“We’ll need to run a full diagnostic on the battery management system,” he explained. “It could be the battery itself, the alternator, or possibly the battery monitoring sensor. The diagnostic fee is £85, and depending on what we find, repairs could range from £200 to £600.”
That seemed excessive for what might be a simple electronic glitch. Before committing to the dealer visit, I decided to do my own research.
The Hunt for Solutions
I spent an evening browsing Volvo forums and owner groups online. I wasn’t alone – many V70 owners had experienced similar issues with their stop/start systems and battery warnings. Some had paid hundreds for repairs that didn’t fully resolve the problem, while others had found more straightforward solutions.
One thread caught my attention. A user described a specific sequence to reset the Battery Management System (BMS), which several others had confirmed worked for them. The procedure seemed too simple to be effective, but at this point, I had nothing to lose.
The DIY Fix
I sat in my driveway the following day, ready to try this mysterious reset procedure. The instructions were specific:
- Switch on the ignition (without starting the engine)
- Turn on the dipped headlights
- Press the rear fog light button six times in sequence (on-off-on-off-on-off)
- Press the hazard warning light button three times (on-off-on)
- Look for the battery symbol on the dash to flash quickly three times
I followed each step carefully, feeling slightly ridiculous as I toggled the fog light and hazard buttons. “This can’t possibly work,” I thought to myself. After completing the sequence, I waited anxiously for any sign of success.
To my amazement, the battery symbol on the dashboard flashed three times in quick succession! According to the forum, the BMS was successfully reset.
The Moment of Truth
The real test would come during my daily commute. I started the engine, noticing immediately that the battery warning was gone. That was promising, but I was more interested in whether the stop/start function would work again.
As I approached the first red light of my journey, I applied the brakes and came to…
