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Loud Engine Ticking on 2020 GMC Sierra 1500 5.3L - Lifter Issue?

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Mike T. · rep 0 · May 22, 3:47 AM · 1 replies · solved · Question

Vehicle: 2020 GMC Sierra 1500 SLT 5.3L

Hi all,

I'm reaching out because I've developed a really concerning engine ticking noise on my 2020 GMC Sierra 1500 SLT, which has the 5.3L V8 engine. It's got about 60,000 miles on it. The ticking is pretty loud, especially when the engine is cold, and it seems to get a bit quieter but doesn't disappear completely once it warms up.

I've heard about the Active Fuel Management (AFM) or Dynamic Fuel Management (DFM) lifter issues with these engines, and I'm worried this might be what I'm experiencing. The truck still runs, but I'm nervous about driving it much. I've been diligent with oil changes using synthetic oil.

Has anyone else dealt with this on their 2020 Sierra? What was the diagnosis and fix? Is this something that needs immediate attention, or can it wait a bit?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:47 AM

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ClearTheCode admin answer:

Engine ticking in a 2020 GMC Sierra 1500 with the 5.3L V8, especially with 60,000 miles, is a common concern often linked to the Active Fuel Management (AFM) or Dynamic Fuel Management (DFM) system. This system can indeed lead to lifter failures.

  1. Identify the Sound: A distinct, rhythmic ticking or tapping sound, often more pronounced on one side of the engine, is characteristic of a failing lifter. It may change with engine RPM.

  2. Check for DTCs: A failing lifter can lead to misfires. Look for codes like P0300 (Random/Multiple Cylinder Misfire Detected) or specific cylinder misfire codes (e.g., P0301 for cylinder 1). A Check Engine Light will usually accompany these codes.

  3. Oil Pressure: While less common as a direct cause of ticking, low oil pressure can exacerbate lifter issues. Ensure your oil pressure gauge is reading within normal limits.

Common Causes:

  • AFM/DFM Lifter Failure: This is the most prevalent cause. The lifters designed for cylinder deactivation can fail due to oil starvation, wear, or collapse, leading to improper valve operation and contact with the camshaft.
  • Camshaft Wear: A failed lifter can also damage the camshaft lobe it rides on, requiring replacement of both components.
  • Oil Sludge/Contamination: Poor oil maintenance, even with synthetic, can contribute to lifter issues, though less likely if you're diligent.

When to See a Shop: This issue requires immediate attention. Driving with a failed lifter can lead to:

  • Further damage to the camshaft.
  • Damage to the cylinder head.
  • Potential engine failure if the lifter breaks apart and sends debris through the engine.

Take your Sierra to a GMC dealership or a trusted mechanic specializing in GM engines. They will likely perform:

  • A cylinder compression test.
  • A borescope inspection of the cylinders and camshaft.
  • Listen to the engine with a stethoscope to pinpoint the exact source of the noise.

The repair typically involves replacing the affected lifters, and often the entire set, along with the camshaft and potentially other related components. Some owners opt for an AFM/DFM delete kit to prevent future issues, but this is a more extensive modification.

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