2015–2020 GMC Yukon: Ticking and misfire, often one cylinder (5.3L AFM lifters)
Likely causes, ranked
- Collapsed or stuck AFM lifterShop
- Damaged camshaft lobeShop
Real-owner fix counts will appear here as reports come in.
DIY or shop: See DIY or shop section
Parts to check
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Symptom: A ticking noise, rough running and a misfire code such as P0300 or a single-cylinder code, often on an AFM cylinder.
Likely causes
- AFM lifters. GM-Trucks owners report collapsed lifters on 5.3L and 6.2L engines. GM's bulletin replaces the lifters and guides and checks the cam.
DIY or shop?
Shop.
Useful steps
- Read misfire codes.
- Don't keep driving on a dead cylinder.
- Ask about powertrain warranty coverage.
Vehicle focus: 2015–2020 GMC Yukon.
Safety / mechanic note
A collapsed lifter can damage the cam and cause power loss. Verify with a mechanic or dealer.
Related trouble codes
Maintenance schedule for the GMC Yukon
Recalls & service bulletins
Technical service bulletins
- 15-06-01-002 GM procedure for ticking noise and misfire on V8s: inspect valve motion, lifters and cam lobes, and replace lifters and guides as needed. Details
NHTSA complaints: 207 keyword-matched complaints for GMC YUKON 2015–2020 (of 1,219 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-15).
Always check your VIN for open recalls at nhtsa.gov/recalls.
Sources
What actually fixed it?
Had this problem? Tell other owners what the real fix was. Reports are counted above; we never show made-up numbers.