Ford F-150 2020 Hard Start / Starts Then Dies
The engine cranks and starts but immediately dies, occurring every time. This points to a fuel delivery, ignition, or security system issue that prevents the engine from staying running.
Diagnosis Details
Possible Causes
Faulty fuel pump or fuel pump driver module – loss of fuel pressure after initial start
Clogged fuel filter or contaminated fuel – restricts fuel flow
Faulty crankshaft or camshaft position sensor – engine loses sync and shuts down
Immobilizer / PATS (Passive Anti-Theft System) issue – key not recognized, engine starts then dies
Vacuum leak (e.g., intake manifold gasket, PCV hose) – causes lean stall after start
Faulty idle air control valve or throttle body – unable to maintain idle
Related OBD-II Codes
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What You Should Do
Check fuel pressure at the rail (should hold ~55-65 psi).
Inspect for any security light flashing (PATS).
Scan for diagnostic trouble codes.
Test crankshaft/camshaft position sensors.
Inspect air intake for leaks.
If fuel pressure drops quickly after prime, suspect fuel pump or module.
Related Repairs
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Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.
