The same truck as the 2016 with a third fewer complaints — brakes and transmission still decide it.

The automatic shudders at steady cruise, hesitates and thumps between gears, and in the file's worst cases stops driving the truck. There is no recall and no special coverage for it on a 2017. A shop inspecting a high-mileage example priced a rebuilt unit at $3,000 to $3,500 before labour and $4,000 to $5,000 installed, noting that a four-wheel-drive truck costs more to do because the transfer case and both driveshafts have to come out. A revised-fluid flush settles many trucks that are only shuddering; nothing settles one that is already slipping. Drive it long enough to feel a 1–2 shift when the transmission is hot.

AFM — Active Fuel Management, the system that shuts off cylinders under light load to save fuel — uses collapsible lifters that can stick or collapse. When one fails it destroys the camshaft, turning the job into lifters plus a cam for several thousand dollars. The tells are a tick or tap at cold start, misfire codes and lost power. No recall covers it on this year. A mechanic who tears these engines down estimates failure in roughly 3 to 5 percent of them, anywhere between 30,000 and 100,000 miles, and notes that dealers often replace only some lifters, so it can come back.

Customer Satisfaction Program 17456 — a CSP is a Customer Support Program, the industry's quieter cousin of a recall — covers a rear wheel hub nut retainer that was not formed properly. If the nut loosens, a StabiliTrak message appears in the driver information centre, the traction-control light comes on, axle fluid can leak from the seal area and the rear axle housing itself can be damaged. Dealers replace the retainer and inspect the axle-tube threads. Because the warning is a dashboard message rather than a noise, ask the seller whether it was ever performed and have a shop look at the rear axle seals.

The combined transmission-fluid and A/C condenser cracks under thermal cycling and vents its refrigerant. GM's Special Coverage 17336 covered 2015–2017 Suburbans for five years or 60,000 miles, so on a 2017 that window is closed. A mechanic who owns one of these explains the design flaw: the condenser hangs on its own weight until it cracks, and it needs a bracket to support it. Run the A/C hard before you buy.