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Car Won't Start: Causes, Diagnosis & Repair Costs

A no-start condition usually traces back to one of three systems: battery & charging, starter & ignition, or fuel delivery. The sound your car makes when you turn the key narrows the field before any tool comes out.

Typical repair cost: $358–$738

Common Causes

Dead or weak battery
Most common cause. Battery is older than 3–5 years, terminals corroded, or charge drained overnight.
Failing starter motor
Single loud click or rapid clicking with full dash lights typically points to a bad starter solenoid or motor.
Bad alternator
Alternator stopped charging — battery ran flat overnight. Jump starts work briefly then die.
Fuel delivery failure
Cranks strongly but no fire-up. Bad fuel pump, clogged filter, or failed relay.
Ignition / spark loss
Crank with no fire — coil packs, crank sensor, or ignition switch problem.

How Mobile Mechanics Diagnose It

  1. Turn key to ON — dim dash lights point to battery.
  2. Watch headlights while cranking — heavy dim = weak battery.
  3. One loud click, no crank = starter or major voltage drop.
  4. Strong crank, no fire = fuel or spark — needs scan tool.
  5. Load test battery and alternator at the vehicle before swapping parts.

Repair Options & Cost Ranges

Battery replacement
$180–$350
Mobile install at your location, old battery recycled.
Starter replacement
$350–$700
Quality starter with warranty, installed on-site.
Alternator replacement
$400–$800
Includes charging system test and belt inspection.
Fuel pump replacement
$500–$1100
Pressure tested before swap.

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FAQs

Why does my car click but not start?

Almost always a dead battery or failing starter solenoid. A load test confirms which one in minutes.

Can a bad alternator stop a car from starting?

Yes. A bad alternator drains the battery overnight, so the car won't crank in the morning.

How much does it cost to diagnose a no-start?

Mobile diagnostic visits typically run $80–$150 and the cost is usually credited to the repair.