Failure mode - Ford 3.5L EcoBoost Gasoline (F-150, Expedition, Transit, Raptor - 2011-present)

Cam phaser / VCT rattle and cam-timing DTCs

Reliability tier: aggregated - verify before ordering, see /disclosure/

Symptoms

cold-start rattle or ticking that fades as oil pressure builds
MIL with cam-timing DTCs (P0011/P0015/P0016-P0019/P0021/P0025) or VCT circuit codes (P0365/P0369)
rough or delayed cold start
PCM updates required after VCT unit or long-block replacement (per Ford SSM)

Compare with the other causes of the same sign on this engine: hard start, long crank or no-start (5 causes) · ticking, knocking, rattle or whine (4 causes) · misfire, rough idle, hesitation or surging (5 causes)

Root cause

Cam-phaser and VCT hardware wear (plus oil-supply sensitivity to the phaser galleries) produces the cold rattle and cam-timing DTCs; Ford's response is a run of 2017-2019 SSMs prescribing VCT unit replacement plus PCM calibration updates, then TSB 20-2315 and field action 21N08 (fact-check 23.10: the earlier-cited TSB 16-0093 was removed here - it is a VCT-solenoid/P0025 bulletin for the NON-turbo 3.5L Ti-VCT, not an EcoBoost phaser item; the cold-start rattle on the 2011-2015 GTDI lives in the timing-chain FM under 16-0027/17-0026).

Diagnosis

listen for the cold-start rattle versus a deeper knock; warm-engine repeat check
scan cam-timing and VCT DTCs on both banks; freeze-frame at start
verify oil level/condition and oil-filter type before condemning phasers
if replacing VCT units or the long block: apply the PCM calibration update per the SSM

Fixes

phaser / VCT unit replacement with the updated hardware and the PCM calibration update; oil-system service while in there ()

Prevalence

very-common