Mechanically the Silverado's twin — the AFM V8s collapse lifters and burn oil, and the 8-speed shudders. Same checks, dressier trim.
The Sierra 1500 shares its drivetrain with the Silverado, so it inherits the same strengths and the same weak points. Buyers often pay more for the badge and trim, which makes a hard look at the valvetrain and transmission even more important before money changes hands.
Active Fuel Management lifters collapse and can wipe a cam lobe.
CHECK Listen for a tick or knock and scan for a single-cylinder misfire.
These V8s are known to consume oil under AFM operation.
CHECK Check oil level and ask about top-offs between changes.
The 8-speed shudders and shifts harshly when the converter or fluid is failing.
CHECK Feel for a light-throttle vibration at 25–45 mph and check fluid condition.
Brake-assist concerns affected these trucks.
CHECK Confirm firm brake feel and check for open recalls by VIN.
Front-end and steering wear shows up as a clunk or wander.
CHECK Inspect tie rods and idler/pitman and road test for wander.
Bidirectional OBD-II scan tool · Paint depth gauge · Tire tread depth gauge & DOT date decoder · Brake pad & rotor calipers / measurement tools · Battery & charging system tester · Compression and cylinder leak-down testers · Digital borescope · Floor jack and jack stands …
See the full Pre-Purchase Vehicle Inspection tool kit →
Pre-tagged for the GMC Sierra 1500 (2014–2019).