A MECHANIC has issued a warning over a little-known car part that is causing confusion among drivers.
It’s an issue affecting a lot of newer cars such as Volvos, Jeeps, Mercedes, and other leading vehicle brands.
TikTok car expert Sherwood Cooke Jr (@royaltyautoservice) recently posted a video about the issue that went viral.
He stood near a 2021 Volvo V90 and shared how it had both a main battery and an auxiliary battery—something many car owners don’t know about.
Auxiliary batteries are becoming common in European vehicles and domestic cars, according to the car pro.
“Mercedes, Jeep, a lot of vehicles have this, not just European,” he said.
“They have two batteries on them.”
Cooke’s video, posted on January 4, has racked up over 368,000 views and 15,000 likes and counting.
He said many vehicles now rely on secondary power sources to stabilize electrical systems.
If an auxiliary battery fails, you could find yourself facing costly repairs as it powers key functions like ignition, brake assist, and auto stop-start.
Cooke said diagnosing whether the main or auxiliary battery is causing electrical issues can be tricky and time-consuming.
And when it is the secondary battery that failed, getting a new main battery won’t fix the problems.
An auxiliary battery is a small extra battery in many modern cars. It helps power electronics like locks, alarms, and screens, especially in cars with lots of features or hybrid engines.
When you start your car, the main battery does most of the work, but the auxiliary battery keeps other systems running smoothly.
This prevents problems like flickering lights or malfunctioning electronics.
The car’s system manages both batteries, making sure they charge properly and provide power when needed.
This helps keep everything working without draining the main battery.
How to avoid being scammed at the repair shop
Motorautocar and the AARP have east-to-follow tips to avoid being scammed by a repair shop.
Motorautocar suggests asking to see parts that have been replaced or to see old fluids after they were swapped. If the shop says that’s impossible or refuses, it could be a sign it wasn’t done. Ask for a walkaround of the repairs that were done. Most mechanics are happy to show you what was done in the shop. While being walked around, look for evidence of repairs like the area being cleaned off, shiny new parts, tool marks on the bolts, tools being out or nearby, etc. Before taking your car in, look at other customer reviews on Google, Yelp, or Facebook. Many customers only review a company if they have negative reviews, so keep an eye out. For costly repairs, consider getting multiple opinions. If two to three shops suggest identical repairs, it’s likely to be true. Test a new shop with minor issues you’re aware of to see if they add anything to the repair bill. If applicable, bring someone to the shop who knows about cars to have them double-check or read a repair bill. Get everything on paper. Not only is it important for your repair records, but it can help protect you if legal measures are necessary.Source: Motorautocar, AARP
To combat confusion, Cooke advises replacing both batteries at once.
His video, captioned “Lots of weird issues because of this,” received over 450 comments thanking Cooke for the information.
A Jeep owner said they spent nearly $500 on batteries without even factoring in labor costs since they replaced them on their own.
Another viewer said she dealt with this issue repeatedly but the dealer kept insisting they couldn’t figure out the problem.
A third user didn’t hold back, stating, “Anything after 2020 is junk,” expressing strong dissatisfaction with newer models.
And yet another user shared their experience with a previous Mercedes-Benz, saying the auxiliary battery caused issues with the electronic shifter.
“That was fun,” they joked.
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