When your 2017 Chevrolet Suburban produces a ticking noise from the V8 engine combined with a P0302 code, a failing lifter on cylinder 2 is the likely culprit. This combination of symptoms—mechanical noise plus misfire—strongly suggests lifter failure rather than simple ignition or fuel issues.
Understanding the Connection
The 5.3L V8 uses hydraulic lifters to operate the valves. When a lifter fails—especially the AFM lifters—it may collapse partially, preventing the valve from opening fully or at the correct time. This causes both the ticking noise (mechanical) and the misfire (insufficient valve action). Cylinder 2 is not an AFM cylinder, but all lifters can develop problems.
Lifter Failure Modes
Lifters can fail in several ways: hydraulic collapse (won't maintain oil pressure), mechanical wear (roller or body damage), or complete failure where the lifter breaks apart. A partially collapsed lifter creates the characteristic tick as it doesn't fully open the valve, also causing the misfire as combustion is compromised.
Why Cylinder 2 Is Affected
Cylinder 2 uses a standard hydraulic lifter (not an AFM lifter), but these can still fail from oil starvation, debris, or manufacturing defects. Oil passages to cylinder 2's lifters may become restricted over time. High mileage increases the likelihood of lifter wear regardless of type.
Diagnostic Confirmation
The ticking noise combined with cylinder-specific misfire is highly indicative of lifter failure. Use a stethoscope to isolate the noise to the cylinder 2 area. Swapping ignition coils won't move the misfire if the lifter is failed—this helps confirm mechanical rather than ignition cause. Monitoring lifter preload data (if available) can reveal collapsed lifters.
Repair Options
Lifter replacement for cylinder 2 requires significant disassembly—expect $1,500-$2,500 for a single-cylinder repair. Many owners opt to replace all lifters on the affected bank ($2,500-$3,500) or all 16 lifters ($3,500-$4,500) since the labor is extensive. If AFM lifters show wear, complete AFM delete with non-AFM lifters and camshaft is a popular choice.