Two issues dominate Silverado owner discussions: lifter failures on V8 engines equipped with cylinder deactivation (AFM/DFM), and a well-documented torque converter shudder on the 8-speed automatic transmission. Both have distinctive early symptoms, and both are considerably cheaper to address early than after a full failure.
A Note Before You Read Further
These are widely reported issues on specific engines and model years — not a verdict on every Silverado. Plenty run to very high mileages without either problem. Use this as a what-to-listen-for checklist when buying, and a shortcut when diagnosing an existing truck.
1. AFM/DFM Lifter Failure (V8 Engines)
Active Fuel Management (and its successor Dynamic Fuel Management) shuts down cylinders under light load to save fuel, using special collapsible valve lifters. Those lifters — and the system switching them — are the Silverado’s most discussed failure point: a lifter that collapses or sticks stops opening its valves, and the result is a dead cylinder with a distinctive loud ticking or knocking from the top of the engine.
Recognise it by: a sudden loud tick or knock — see our ticking and knocking guides for how it compares to other engine noises — usually with a misfire code for one cylinder (P0301-family) and a noticeable loss of smoothness. It frequently appears without much warning.
What to do: stop driving early. A collapsed lifter hammering its camshaft quickly turns a lifter job into a lifter-plus-camshaft job. Repairs typically involve replacing lifters on at least the affected bank, and often the cam.
Cost: $2,000 – $4,000 depending on how much was damaged before it was caught. Some owners opt for AFM/DFM delete or disabler devices afterwards — note that physically deleting the system has emissions compliance implications that vary by jurisdiction, so check local rules before going that route.
2. 8-Speed Transmission Torque Converter Shudder
Many 2015–2019 Silverados with the 8-speed automatic exhibit a shudder at light throttle and steady speed — the sensation of driving over a washboard or rumble strip — caused by torque converter clutch lock-up juddering. It was widespread enough that GM issued technical service bulletins prescribing a full fluid exchange with a revised fluid specification, and litigation followed in the US.
Recognise it by: exactly the pattern in our transmission slipping and transmission jerking guides — a light-throttle, steady-speed shudder around 25–80 km/h (15–50 mph) that disappears when you accelerate harder or lift off.
What to do: the documented first remedy is the TSB fluid exchange with the updated fluid, which resolves a large share of cases — a far cheaper starting point than converter replacement. Check whether it was already done on a used truck.
Cost: fluid exchange $200 – $400; torque converter replacement if the shudder persists, $1,500 – $2,500.
3. Brake and Vacuum Pump Issues (2014–2018)
A range of 2014–2018 trucks developed reduced brake assist from a failing engine-driven vacuum pump — the pedal feels unusually hard and stopping power drops, sometimes intermittently. This led to recalls and service campaigns on affected vehicles.
Recognise it by: a hard pedal with weak braking, distinct from the soft-pedal faults in our spongy brake pedal guide — hard-and-weak points at assist, soft-and-long points at hydraulics.
What to do: check the VIN for open recalls first — this may be a free fix. Otherwise a vacuum pump replacement is $300 – $600.
4. Interior Electronics and Cluster Glitches
Less serious but frequently mentioned: infotainment freezes and reboots, and on earlier generations instrument cluster gauge failures. Software updates resolve many infotainment complaints; cluster repairs are $150 – $400.
What to Check Before Buying
- Cold-start the engine and listen for ticking from the top end — a warm engine can mask an early lifter fault.
- Drive at light throttle at steady 40–70 km/h and feel for shudder.
- Ask whether the 8-speed fluid exchange TSB was performed, with paperwork.
- Check the VIN for open recalls, especially brake-assist related on 2014–2018 trucks.
- Press the brake pedal with the engine off and then on — assist should noticeably soften the pedal when the engine starts.
See our brands hub for the other guides in this series.
Frequently Asked Questions
What is the AFM lifter problem on the Silverado?
Cylinder-deactivation lifters on AFM/DFM-equipped V8s can collapse or stick, leaving a dead cylinder with a loud tick or knock and a misfire code. Caught early it is a lifter job; driven on, it often takes the camshaft with it.
Why does my Silverado shudder at steady speed?
Light-throttle shudder on 2015–2019 trucks with the 8-speed automatic is a documented torque converter clutch issue. GM’s service bulletin fluid exchange with revised fluid resolves a large share of cases.
Is the Silverado 8-speed transmission reliable?
The shudder issue is well documented on 2015–2019 model years, but the TSB fluid exchange resolves most cases, and trucks that have had it done — or later model years — fare considerably better.
Should I disable AFM on my Silverado?
Disabler devices that keep the engine in V8 mode are popular preventive measures. Full physical deletes have emissions compliance implications that vary by jurisdiction, so check local rules first.
How much does a Silverado lifter repair cost?
Typically $2,000 – $4,000 depending on whether the camshaft was damaged before the fault was caught — which is exactly why stopping early when the ticking starts matters.
