When your 2018 Chevrolet Silverado produces a ticking or clicking noise on startup that may or may not diminish as the engine warms up, hydraulic lifter issues are the likely culprit. The Silverado's V8 engines with Active Fuel Management have specific lifter considerations that affect this diagnosis.
Normal Versus Abnormal Startup Noise
Some brief startup noise is common on GM V8s as oil pressure builds and reaches the hydraulic lifters. A brief tick lasting 1-3 seconds that quickly subsides is often considered acceptable. However, ticking that persists beyond the initial few seconds, continues after warm-up, or accompanies performance issues indicates a problem requiring attention.
AFM Lifter Issues
The Active Fuel Management lifters on cylinders 1, 4, 6, and 7 are more complex than standard lifters and have a higher failure rate. When AFM lifters fail, they often produce a distinctive tick and may cause misfires. The failure can be gradual—starting as an occasional noise and progressing to constant ticking and misfire codes.
Standard Lifter Concerns
Even non-AFM lifters can develop issues. Oil starvation from extended drain intervals, oil breakdown, or clogged passages prevents proper lifter operation. Worn lifter bores in the heads allow excessive movement. Collapsed lifters from internal failure cause consistent ticking. Any lifter can develop problems, but AFM lifters fail more frequently.
When to Be Concerned
Take action if ticking persists more than 5-10 seconds after startup, the noise continues at operating temperature, you also have misfire codes (especially on AFM cylinders), oil consumption has increased noticeably, or the ticking sound intensifies over time.
Repair Options
For early-stage issues, some owners report success with oil flush treatments and switching to higher-quality oil with frequent changes. Once lifters are significantly damaged, replacement is needed. AFM lifter replacement costs $2,500-$4,000. Many owners opt for complete AFM delete with non-AFM lifters and cam, costing $3,000-$5,000 but eliminating the problem-prone AFM system entirely.