Symptoms Loud ticking or tapping noise from engine on cold start that may or may not diminish at operating temperature; check engine light with misfire codes (P030X); rough idle or engine hesitation at low RPM; engine stall or no-start in severe cases; ticking progresses to grinding if camshaft lobe wear occurs.
Why it matters for your claim Strong: manufacturer-acknowledged defect (TSB 09-009-23) for 2022-2023 MY; class-action litigation confirms widespread knowledge for earlier MY. Progressive nature (tick → misfire → cam wear → engine failure) supports substantial-impairment argument. Multiple repair attempts (lash adjuster replacement, rocker arm replacement, possible long-block) create documented repair history.
Typical fix TSB 09-009-23 (2022-2023): replace all 12 intake hydraulic lash adjusters; covered under warranty. Earlier MY: replace rocker arms and associated lifter/cam components; cost $1,500-$4,500 out of warranty; some required long-block replacement. Class action lawsuit filed Jan 2022 (CA/FL/IL/MA) seeking warranty relief.
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