You turn the key and nothing happens. Or it clicks. Or it cranks but won't fire. Each symptom points to a different problem — here's how to diagnose yours.
11. Dead Battery (Most Common)
Symptoms: Clicking sound when you turn the key, dim or no dashboard lights, interior lights very dim. Cause: Battery has discharged below the level needed to start the engine. Common causes include leaving lights on, a failing alternator, or a battery that's simply reached end of life (typically 3–5 years). Fix: Jump-start using jumper cables and a running vehicle, or call for roadside assistance. If the battery keeps dying, have the charging system tested.
Pro tip: In Brisbane's heat, car batteries typically last 3–4 years — shorter than in cooler climates. If yours is over 3 years old, get it tested proactively.
22. Faulty Starter Motor
Symptoms: Single loud click when you turn the key (not rapid clicking), engine doesn't crank at all. Cause: The starter motor has failed or the solenoid is faulty. Fix: This is not a roadside fix — the vehicle needs to be towed to a mechanic. Some experienced drivers can temporarily fix a stuck starter by tapping it with a hammer, but this is a temporary measure only.
33. Empty Fuel Tank
Symptoms: Engine cranks normally but won't fire, fuel gauge reads empty (or near empty). Cause: You've run out of fuel. It sounds obvious, but fuel gauges can be inaccurate, especially in older vehicles. Fix: Call for roadside assistance — many operators including Car Towing Services Brisbane can bring fuel to your location. Don't try to push the car to a servo on a busy road.
Pro tip: Modern fuel pumps are cooled by the fuel in the tank. Regularly running your tank below 1/4 can shorten the pump's life significantly.
44. Flooded Engine (Older Carburetted Cars)
Symptoms: Strong smell of petrol, engine cranks but won't start, especially after multiple short start attempts. Cause: Too much fuel in the combustion chamber. More common in older carburetted vehicles. Fix: Hold the accelerator fully to the floor and crank the engine for 10 seconds. This clears excess fuel. Wait 5 minutes and try again normally. If it still won't start, call for assistance.
55. Faulty Ignition Switch
Symptoms: Nothing happens when you turn the key — no click, no crank, no lights. Or the key turns but nothing engages. Cause: The ignition switch has failed electrically. Fix: This requires a mechanic or auto electrician. The vehicle will need to be towed.
66. Security System / Immobiliser Fault
Symptoms: Engine cranks but won't start, security light flashing on dashboard. Cause: The vehicle's immobiliser has activated and isn't recognising the key. Common after a flat battery or if the key fob battery is dead. Fix: Try your spare key. If that doesn't work, check the key fob battery. If still no luck, the immobiliser may need to be reset by a dealer or auto electrician.
Pro tip: If your car has a transponder key and you've recently had the battery replaced, the immobiliser may need to be re-synced.
77. Faulty Fuel Pump
Symptoms: Engine cranks normally but won't start, no fuel smell, no obvious cause. Cause: The fuel pump has failed and isn't delivering fuel to the engine. Fix: This is a workshop repair. The vehicle needs to be towed to a mechanic for diagnosis and pump replacement.
88. Seized Engine
Symptoms: Engine won't crank at all, or makes a grinding/clunking sound when you try. Cause: Engine has seized due to lack of oil, overheating, or internal mechanical failure. This is the most serious scenario. Fix: Do not attempt to start the engine again. Call for towing immediately. A seized engine is a major repair — potentially a full engine replacement.
Frequently Asked Questions
Dave Nguyen
Owner & Lead Operator, Car Towing Services Brisbane
Dave has been towing vehicles across Brisbane, Logan, Ipswich, and the Gold Coast for over 15 years. He founded Car Towing Services Brisbane with one rule: treat every customer's car like it's your own.