2018 Chevrolet Impala

The 6T70/6T75 six-speed automatic transmission in the 2018 Impala develops harsh shifting, delayed engagement, and a shudder during light acceleration at 30-50 mph. The shudder originates from the torque converter clutch and feels like driving over a washboard road. This is a well-documented issue across multiple GM models using this transmission family.

Perform a transmission fluid flush using Dexron HP ATF as a first step. If the shudder persists, the torque converter must be replaced. Reference GM TSB 18-NA-355 for shudder diagnosis. In severe cases, the valve body or complete transmission may need replacement.

The 2018 Impala is prone to parasitic battery drains that kill the battery overnight or within a few days of sitting. Owners report the car failing to start, dimming headlights, flickering dash lights, and infotainment system resets. The issue is often traced to the body control module (BCM) not properly entering sleep mode after the vehicle is turned off.

Dealer performs a BCM software update to correct the sleep mode timing. If the drain persists, a parasitic draw test should be performed to identify the offending module. Battery replacement with a proper AGM battery and terminal cleaning may also be needed. Reference GM TSB 16-NA-049 for parasitic drain diagnosis.

The hydraulic power steering rack develops leaks at the input shaft seal and internal seals, causing a gradual loss of power steering fluid. Owners notice a whining noise from the power steering pump, increased steering effort, and fluid puddles under the front of the vehicle. Low fluid levels can damage the power steering pump if not addressed promptly.

Replace the power steering rack and pinion assembly. Top off or replace the power steering fluid and inspect the pump for damage from running dry. Some owners add power steering stop-leak as a temporary measure, but the seals typically continue to degrade.

The A/C compressor can fail prematurely, resulting in warm air from the vents. Owners report the A/C blowing cold intermittently before failing completely. A loud grinding or clicking noise from the compressor clutch may precede total failure. Metal debris from the failed compressor can contaminate the entire A/C system.

Replace the A/C compressor, receiver/drier, and expansion valve. If the compressor has shed metal debris, the condenser and all A/C lines must be flushed or replaced to prevent contaminating the new compressor. Evacuate and recharge the system with the correct amount of R-134a refrigerant.

The 8-inch MyLink touchscreen display develops delamination where the screen layers separate, creating bubbles, discolored areas, and unresponsive touch zones. The system also freezes, reboots randomly, and loses Bluetooth connectivity. The delamination is caused by heat exposure and adhesive breakdown and worsens over time.

Replace the infotainment display unit. GM released updated display units with improved adhesive and thermal management. A software update may resolve freezing and Bluetooth issues but will not fix physical delamination. Aftermarket replacement screens are available at lower cost.

General Motors LLC (GM) is recalling certain 2018-2019 Chevrolet Equinox, Impala, Cruze, Volt and Bolt EV vehicles, GMC Terrain vehicles, Buick Lacrosse and Regal vehicles, Cadillac XTS and XTS Professional vehicles and 2018 Chevrolet Malibu vehicles. The rear brake caliper pistons may have an insufficient coating causing gas pockets to form, potentially reducing rear brake performance.

A reduction of braking performance can increase the risk of a crash.

GM will notify owners, and dealers will bleed the vehicle's brake system, free of charge. The recall began October 11, 2018. Owners may contact Buick customer service at 1-800-521-7300, Cadillac customer service at 1-800-458-8006, Chevrolet customer service at 1-800-222-1020, or GMC customer service at 1-800-462-8782. GM's number for this recall is 18279.