2019 Chevrolet Tahoe: What to check before buying

Transmission failure is the dominant pattern. Symptoms include hesitation, harsh or slipping shifts, a loud shudder, overheated or burnt fluid, and sudden loss of drive power at highway speed while the engine revs. Shops cite a sticking pressure control solenoid (code P0796), a failed torque converter, or metal shavings. Most cases end in a full replacement, usually between 88,000 and 128,000 miles. A separate set of police fleet reports describes stalling and sputtering traced to fuel pumps (code P2635), and some vehicles needed repeat pump replacements.

The faults are spread across several systems. A recurring "Service Trailer Brake System" warning sometimes leads to a module replacement. Screens and gauges flicker, reset on their own, or register phantom button presses, often after rain or a car wash. Some reports describe a sudden loss of power, steering assist, and braking at freeway speed with a blank dash. Others describe a "Reduced Steering Assist" message that disables reverse. Wiper failures and lost communication with the instrument cluster also appear. One injury crash involved airbags that did not deploy.

Internal engine failure is reported on both V8s. On the 5.3L, collapsed lifters and a bent pushrod show up around 92,000 miles, and owners blame the cylinder deactivation system. On the 6.2L, camshaft and rod bearing failures cause sudden seizure or loss of power on highways, often with no warning. Some owners say the same failure is already under federal investigation for later model years. Other symptoms include ticking, knocking, shaking, misfires, blue or white smoke, and heavy oil consumption. One engine reportedly failed twice.

The main pattern is airbags that fail to deploy in serious crashes. Reports include T-bone and side impacts, a collision with a tree, and hits that damaged the frame. Six of the seven complaints involve crashes and four involve injuries, including head strikes on the steering wheel and fractured ribs. In some crashes the seat belts also failed to lock or retract, and the airbag warning light stayed on afterward. One opposite case describes nearly every airbag firing when a door brushed a fence post at walking speed.

Power steering assist cuts out without warning, sometimes at 70 mph and often right after startup. A "Reduced Steering Assist" warning comes with a heavy or locked wheel, and reverse acts like neutral. Shutting the vehicle off for several minutes usually restores steering, so dealers often cannot reproduce the fault. One report describes a brief total power loss at speed that took out both steering and brakes. Owners point to a recall covering the same issue on 2021 models. Loss of control is the main risk.

Speed drops unexpectedly at highway speed in the few reports filed. With cruise control set, one vehicle slowed sharply next to semi trucks, then downshifted and sped back up within seconds. Another reports a misfire and loss of speed while merging onto an interstate shortly after purchase. One owner ties the symptoms to an existing safety recall. With only 3 complaints, no clear mileage pattern appears, but every report involves a traffic hazard at speed.

Struts leak and seize, and air suspension parts corrode, leading shops to recommend replacing the struts on both sides. Drivers describe shaking, rumbling, and the body shifting around over bumps. One alignment and suspension complaint also involved a transmission replacement. A separate idle tremor was blamed on the motor mounts and continued even after new mounts, bolts, and shims were installed. Only 3 complaints were filed, so these read as scattered failures rather than one widespread defect.

Only two complaints were filed. In one, the pedal went stiff and the vehicle rolled forward into a building, causing a crash. The other describes an engine problem more than a brake fault. Power dropped on the highway, the check engine light came on, and the vehicle could not go over 30 mph before it shut down. The dealer said the repair required dropping the engine. No repeating brake defect shows up here.