2016 Buick Verano

The 2.4L Ecotec engine develops timing chain stretch that manifests as a rattle on cold starts and eventually progresses to check engine lights with camshaft/crankshaft correlation codes (P0016, P0017). The timing chain guides and tensioner wear prematurely, particularly if oil changes are not performed on schedule. Severe chain stretch can lead to jumped timing and engine damage.

Replace the timing chain, tensioner, and all guides as a complete set. This repair requires removal of the front timing cover. Use the updated GM tensioner design. Maintain strict oil change intervals with full synthetic oil to minimize future chain wear. Clear all engine codes after repair and verify proper timing.

The 6T40 six-speed automatic transmission develops shift flare (momentary RPM spike between gears), harsh engagement from Park to Drive or Reverse, and shuddering during light acceleration. The internal clutch packs and valve body solenoids wear over time, degrading shift quality. Cold weather exacerbates the harsh engagement and delayed shifts.

Transmission fluid exchange with Dexron HP ATF may improve shift quality. TCM software updates are available from GM to refine shift programming. Persistent issues may require valve body replacement or torque converter replacement for shudder symptoms. Reference GM TSB 18-NA-355.

The electric-hydraulic power steering system develops a whining noise that increases with steering wheel input. The power steering pump motor assembly can leak fluid from its seals and the high-pressure line fittings. Low fluid levels from the leak cause the pump to cavitate, increasing the noise and potentially leading to steering assist loss.

Inspect and replace the power steering pump assembly and any leaking high-pressure lines. Top off or flush the power steering fluid. If the steering rack seals are also leaking, replace the steering rack. Use GM-approved power steering fluid (GM part 89021184) or equivalent synthetic fluid.

The IntelliLink touchscreen develops unresponsive areas where touch inputs are not registered, making it difficult to select radio stations, navigation destinations, or climate controls. The screen may also exhibit ghost touches where it registers inputs without being touched. These issues are caused by touchscreen digitizer degradation from heat exposure and UV damage.

Dealer performs a system reset and software update as a first step. If the touchscreen digitizer is physically degraded, the infotainment display module must be replaced. Aftermarket refurbished screens are available at lower cost than OEM replacements. Using a windshield sunshade can slow future UV degradation.

The rear brake calipers develop seized slide pins and stuck pistons, causing uneven and premature rear brake pad wear. Owners notice the vehicle pulling to one side during braking, a scraping or grinding noise from the rear wheels, and shortened brake pad life. The issue is accelerated by road salt exposure and infrequent rear brake service.

Rebuild or replace the rear brake calipers, replace the brake pads and rotors, and clean and lubricate the caliper slide pins with high-temperature silicone brake grease. Flush the brake fluid to remove moisture contamination. Inspect the parking brake mechanism, as a seized parking brake cable can also cause rear caliper binding.