How to Fix Car Won't Start
Learn how to fix car won't start with our detailed step-by-step guide. Follow our easy instructions to get it done right.
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0 of 6 steps completedStep-by-Step Instructions
1 Step 1: Determine Starting Symptom Type
Step 1: Determine Starting Symptom Type
Identify if engine won't crank, cranks but won't start, or starts then dies immediately.
Automotive Troubleshooting Guide
Book on diagnosing no-start conditions
2 Step 2: Check Battery and Connections
Step 2: Check Battery and Connections
Test battery voltage (should be 12.4V+), clean terminals, check for tight connections.
Digital Multimeter
Voltage tester for checking battery and electrical
Battery Terminal Cleaner
Brush and solution for cleaning connections
3 Step 3: Test Starter Motor Operation
Step 3: Test Starter Motor Operation
Listen for clicking (bad starter) or silence (bad starter relay/connection).
Starter Motor
Replacement starter for your vehicle
Starter Relay
Replacement relay for starter circuit
4 Step 4: Check for Fuel Delivery
Step 4: Check for Fuel Delivery
Listen for fuel pump priming when key turns on, check fuel pressure if cranks but won't start.
Fuel Pressure Gauge
Tester for checking fuel system pressure
5 Step 5: Verify Spark at Spark Plugs
Step 5: Verify Spark at Spark Plugs
Remove spark plug, reconnect coil wire, ground plug, crank engine to check for spark.
Spark Tester Tool
In-line tester for checking ignition spark
6 Step 6: Scan for Trouble Codes
Step 6: Scan for Trouble Codes
Use OBD2 scanner to check for immobilizer, crank sensor, or other codes preventing start.
OBD2 Code Reader
Scanner for reading engine fault codes
Crankshaft Position Sensor
Common no-start sensor replacement