2018 Chevrolet Silverado Problems: 4 Known Issues

On the 2007-2019 Chevrolet Silverado, the 5.3L (and 6.2L) V8 with Active Fuel Management — GM's cylinder-deactivation system that drops the engine to 4 cylinders to save fuel — is notorious for collapsed AFM lifters. The special deactivating lifters (and the lifter oil-manifold/VLOM that feeds them) fail when oil pressure/timing to the lifter is compromised, causing the lifter roller to seize. A collapsed lifter no longer opens its valve, producing a dead-cylinder misfire, a loud ticking/tapping, rough idle and major power loss. If driven on, a collapsed lifter can wipe the camshaft lobe and destroy the cam, turning a lifter job into a top-end rebuild. This is consistently ranked the #1 Silverado engine problem and generates heavy forum and search traffic across the entire 2007-2019 AFM era. Disabling AFM (range tuner/AFM delete) is the common owner mitigation.

On the 2014-2018 Chevrolet Silverado, gM recalled about 3.46 million vehicles (NHTSA 19V645 and expanded 20V603), including 2014-2018 Silverado 1500, for an engine-driven brake vacuum pump that loses output over time. Debris and oil sludge build up on the pump's internal filter screen, reducing the vacuum that powers the brake booster. The result is a hard/firm brake pedal requiring much more effort and increased stopping distance, with a 'Service Brake Assist' message. GM attributed 113 accidents and 13 injuries to the condition. Notably, the recall remedy is a software recalibration of the electronic brake control module to add hydraulic boost when vacuum is low — it is NOT a replacement of the failing pump itself, so the underlying P1429 vacuum-pump complaint persists for many owners. High search and complaint volume.

On the 2015-2019 Chevrolet Silverado, silverados with the Hydra-Matic 8L90 (and 8L45) 8-speed automatic are widely reported to hesitate, then shudder, jerk, clunk or 'hard shift' when changing gears — some owners describe a shift so violent it feels like being rear-ended, plus a torque-converter-clutch shudder that feels like driving over rumble strips. The root cause is internal friction/hydraulic issues and torque-converter-clutch micro-slip, often worsened by the original transmission fluid breaking down, sending metal shavings through the unit. GM issued 13+ TSBs and a fluid change (to Mobil 1 Synthetic LV ATF HP / DEXRON-ULV) as the primary remedy, and the defect was the subject of a class action (Speerly v. GM) covering 2015-2019 Silverado and other GM models, though the Sixth Circuit en banc vacated its class certification in June 2025. Very high search and complaint volume.

On the 2014-2020 Chevrolet Silverado, the A/C condenser on K2XX-platform Silverados is a chronic failure point — the condenser develops cracks at the side spot-welds (thermal-stress fatigue) and the discharge line/hose can flex and crack, both of which leak refrigerant and leave the A/C blowing warm air. It was the #1 complaint on the 2014 model year. Because GM's condenser is a 'combi-cooler' with an integrated transmission oil cooler, a failure can affect both cabin cooling and transmission temps. GM acknowledged the line leak with TSB PIT5331 (revised discharge tube + anti-flex bracket, part 23264893); its Special Coverage Adjustment 17336 for combi-cooler leaks (5 years / 60,000 miles) covers only 2015-2017 Tahoe/Suburban/Yukon/Escalade, not the Silverado, and no safety recall was issued. Heavily searched and reported.