If your car has a good battery but won't start, the most common causes are a faulty starter motor, loose or corroded battery and cable terminals, or a malfunctioning ignition switch. It could also be a fuel supply issue, such as a failing fuel pump, or a security system issue where the car does not recognize the key fob.
Common Reasons a Car Won't Start When The Battery is Good
- Faulty Starter Motor: If you hear a single click or nothing at all when turning the key, the starter may be failing
- Loose or Corroded Battery Connections: Even if the battery is charged, corrosion on the terminals or loose battery cables can prevent the high amperage needed by the starter to turn the engine
- Ignition Switch Issues: A faulty switch prevents the key's signal from reaching the starter, often causing dashboard lights to flicker or fail to work properly
- Fuel System Problems: The car might not be getting gas due to a failed fuel pump, clogged fuel filter, or tripped fuel pump relay
- Anti-Theft System/Key Fob Issues: If the key's security chip is not recognized, the car may turn off the engine. Try a spare key or check the key fob battery
- Neutral or Clutch Safety Switch: For automatic transmissions, try shifting to Neutral and attempting to start the engine; for manual transmissions, ensure the clutch pedal is fully depressed, as the safety sensor may be faulty
Contact Us Now
If you have auto electrical problems in Ann Arbor or nearby, call Stadium Auto Service at (734) 369-6787, make an online appointment, or visit our shop. We have technicians who specialize in auto electrical diagnosis and work exclusively on Audi, BMW, Mercedes-Benz, MINI, Porsche, and Volkswagen.