That Tick-Tick-Tick Isn't Normal
You start your 2019 Silverado and hear it—a rhythmic ticking that follows engine RPM. Maybe it's louder when cold and quiets a bit when warm, or maybe it's constant. That ticking is likely a lifter, and on GM trucks with Active Fuel Management (AFM), it's a familiar story.
GM's AFM lifters have earned a reputation, and not a good one.
What the Tick Sounds Like
- Metallic ticking or tapping
- Follows engine RPM (faster tick = higher RPM)
- Usually louder on cold start
- May be more noticeable on one side of the engine
- Sounds like it's coming from the top of the engine
The AFM Lifter Problem
GM's V8 engines in this era use Active Fuel Management to shut down cylinders for fuel economy. Special lifters collapse to deactivate valves. These lifters can:
- Collapse at wrong times
- Stick in collapsed position
- Fail to pump up properly
- Damage the camshaft when they fail
This has been a class action lawsuit-level problem for GM.
Symptoms Beyond Ticking
- Rough idle
- Misfires (P0300 or cylinder-specific codes)
- Check engine light
- Reduced fuel economy
- Oil consumption increase
- Metal debris in oil filter
Diagnosis
- Confirm the noise location - Use a mechanic's stethoscope to pinpoint
- Check oil level and condition - Low oil worsens lifter issues
- Scan for misfires - Failed lifters cause cylinder misfires
- Cut open the oil filter - Look for metal debris
- Listen for camshaft damage - Deeper knock suggests cam wear
Repair Options
Replace Just the Failed Lifter(s)
Cheapest but may have repeat failures. Most shops recommend against this.
Replace All Lifters
More expensive but addresses all potential failures. Still uses AFM lifters.
AFM Delete Kit
Replace all lifters with non-AFM lifters, often with a new camshaft, and reprogram the computer to disable AFM. This is the most popular permanent solution.
Disabler Plus Repair
Fix the failed lifter and add a disabler device to prevent future AFM activation.
Repair Costs
- Single lifter replacement: $1,500 - $2,500 (not recommended)
- All lifter replacement: $2,500 - $4,000
- AFM delete kit (lifters + cam + tune): $3,500 - $6,000
- Camshaft replacement (if damaged): Add $500 - $1,500
- AFM disabler device: $250 - $400
Warranty and GM Response
GM has extended warranty coverage on some model years for lifter-related issues. Check if your 2019 VIN qualifies. Also check for any open recalls or class action settlements.