What are the reasons why a Mercedes-Benz has power but cannot start?
3 Answers
Mercedes-Benz has power but cannot start due to the following reasons: 1. The battery is dead; 2. The spark plugs cannot ignite; 3. There is a fault in the starting circuit. Taking the 2020 Mercedes-Benz A-Class as an example, it belongs to the compact car category, with body dimensions of: length 4622mm, width 1796mm, height 1454mm, wheelbase 2789mm, fuel tank capacity 43l, and trunk capacity 390l. The 2020 Mercedes-Benz A-Class is equipped with a 1.3t turbocharged engine, with a maximum horsepower of 136ps, maximum power of 100kw, maximum torque of 200nm, and is paired with a 7-speed dual-clutch transmission.
Recently, my Mercedes dashboard lights up but the engine just won't start, which is quite annoying. The most common cause is an aging battery with insufficient power - it can supply electricity but can't power the starter. Last time I encountered this, jump-starting didn't work after several attempts, and it turned out the starter motor was stuck. The mechanic said Mercedes parts are precision-made and prone to this. Also, the key anti-theft system might malfunction, like when the remote battery is weak and can't be recognized - reinstalling or replacing the battery should fix it. Another possibility is poor wiring contact or corroded battery terminals causing unstable current, which cleaning might resolve. Anyway, don't experiment blindly; get it checked at a professional shop ASAP to avoid causing other issues.
When playing with cars, if you encounter a situation where the Mercedes has power but won't start, it's mostly a battery issue. You can use a voltmeter to test it—if it's below 12V, it indicates insufficient charge, requiring replacement or recharging. It could also be a faulty starter relay; try replacing it in the fuse box. Anti-theft system malfunctions, such as a dead key fob battery or weak signal, can also prevent starting—replace the button battery or reset the system. If the fuel pump isn't delivering fuel properly, even with power, the engine may not get enough fuel to ignite, leaving it stuck. The ECU module can sometimes act up, especially after heavy rain when moisture causes short circuits. Don't slack on your own inspections—safety first.
