2005 Dodge Magnum Cranks but Won't Start After Dying While Driving

Working hypothesis: Most likely, you lost either fuel delivery or crankshaft position sensor signal. Both are common on this platform for sudden no-start after running fine. If you have no spark and no injector pulse, crank sensor is top suspect. If you have spark but no fuel, pump is likely dead. PCM failure is rare unless you see no scan communication.

Most likely culprits

• Fuel pump failure — Sudden death, especially if you hear no pump prime with key on.
• Crankshaft position sensor failure — No RPM signal, no spark, no injector pulse.
• Fuel pump relay — Less common, but worth checking if pump isn't running.

How to narrow it down

1. Turn key to ON, listen for fuel pump prime — If silent, pump or relay is suspect.
2. Scan for codes (even if no check engine light) — Look for P0335 (crank sensor), P0688 (ASD relay), or anything relevant.
3. Check RPM signal during crank with scan tool — No RPM = crank sensor or wiring.
4. Spray starting fluid in intake, crank — If it fires briefly, you lost fuel. If nothing, suspect crank sensor or spark.
5. Check fuel pressure at rail during crank — No pressure = pump or relay.
6. Check for spark at plug during crank — No spark = crank sensor or PCM issue.

Possible parts (if needed)

• Fuel pump assembly
• Crankshaft position sensor

A few questions

• Did you notice any stalling, sputtering, or warning lights before it died?
• Do you hear the fuel pump prime when you turn the key to ON?
• Have you checked for spark or injector pulse during crank?