The three things every engine needs
A gasoline engine needs fuel, spark, and compression at the right time. Cranking proves the battery and starter work, so the problem lies in one of those three systems or in the computer controlling them.
The 9 most common causes
In order of how often we see them around Irving and Dallas:
- Failed fuel pump or fuel pump relay
- Crankshaft position sensor failure
- Anti-theft immobilizer / key not recognized
- Clogged fuel filter
- Ignition coil or ignition module failure
- Flooded engine from repeated short starts
- Empty tank with a faulty fuel gauge
- Blown fuse for fuel or ignition
- Timing belt broken
Listen for the fuel pump
Turn the key to 'on' without cranking and listen near the rear seat. You should hear a 2-second hum as the pump primes. No hum suggests a pump, relay, or fuse problem.
Check the security light
A flashing key or lock icon on the dash while cranking often means the immobilizer is blocking fuel. Try your spare key — if it starts, the original key's chip or battery is the issue.
Starts cold but not hot?
Heat-related no-starts are common in DFW summers. Failing crank sensors and weak fuel pumps often quit when hot and work again after cooling down.
Get it diagnosed where it sits
We test fuel pressure, spark, and sensor signals on-site so you avoid a tow. Call Aaron's Auto Repair 24/7.