Car Starts Then Dies Immediately: Causes
Key Takeaway
The engine cranks and fires, then dies within seconds. Here are the causes.
Common Causes By Category
| Category | Cause | Code |
|---|---|---|
| Fuel | Fuel pump failing | P0087, P0230 |
| Fuel | Clogged fuel filter | None typically |
| Air | Massive vacuum leak | P0171, P0174 |
| Air | IAC/throttle body stuck closed | P0505 |
| Sensor | Crankshaft position sensor | P0335 |
| Sensor | Camshaft position sensor | P0340 |
| Security | Immobilizer not recognizing key | None |
| Electrical | Failing ignition switch | None |
The Anti-Theft Factor
Many modern vehicles have an immobilizer that allows the engine to crank and start briefly, then shuts it down if the key/fob isn't recognized. Look for a flashing security light on the dashboard.
Diagnosis Priority
1. Check for security/immobilizer light.
2. Listen for fuel pump (buzzing from rear for 2 seconds when key turns to ON).
3. Scan for codes — CKP and CMP sensor codes are common causes.
ProHow Steer Helps
Steer reads stored codes from the brief start attempt, helping identify whether it's fuel, sensor, or security related.
Fix Any Engine Issue with Steer
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