Buyer Research

2018 Cadillac ATS — Should You Buy One?

Typical asking price: $15,000–$22,000. There are 3 high-severity known issues you need to know before handing over a check.

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Kestrel Take

The last ATS sedan (only the coupe carried on into 2019), and a 21-complaint record that is really three items. The electric power steering can cut out mid-drive — three owners describe it, one after replacing the alternator and battery chasing it — and GM's 2025 recall replaces the steering gear on 2017–2018 cars, so the VIN lookup is step one. The 8-speed's torque-converter shudder at 42–48 mph is here as it is on the 2016 and 2017, and two owners have had rear differential bearings go. A 2018 fuel-pump recall covers a high-pressure pump that can work loose and leak fuel. Then the CUE screen cracking under the glass. Twenty-one complaints is a small record, so treat this as a checklist rather than a rating: both recalls closed, a steady 45-mph cruise with the seat quiet, and a rear end that is silent with the radio off make this the most sorted ATS sedan you can buy.

What we checked

Reconciled against public records, 2026-09-25

NHTSA holds 21 owner complaints for the 2018 Cadillac ATS, and 2 recall campaigns.

A big number here usually means a lot of these were sold, not that it is a bad vehicle — popular models collect more complaints for the same rate of trouble. So the total on its own says little. What is worth reading is the shape of it. The largest single group is the transmission and drivetrain at 29%. That is notable without being overwhelming — worth checking, not worth panicking about.

2 recall campaigns cover this model year. Recalls are repaired free, for any owner, with no time limit on most safety campaigns — but only if someone books it in. Ask the seller to show it was done, or have any dealer check the VIN; it takes them a couple of minutes and costs nothing.

Counts come from the NHTSA complaint and recall database — free, public, and worth checking yourself.

Known Issues for the 2018 Cadillac ATS

Ranked by wallet impact. These are documented, recurring problems — not freak accidents. How we decide that.

Electric power steering assist cuts out while driving — steering gear recall (2025)High — wallet impact

Recall 25V175, mailed April 2025, covers 2017–2018 ATS with the Camaro, Corvette and 2016–2018 CTS: the electric power steering assist can fail, and at low speed the wheel goes very heavy. The three STEERING complaints on this year are all this — a 'Service Power Steering, Drive With Care' message, assist dropping out at random and coming back after a restart, sometimes several restarts in one trip. One owner had the shop replace the alternator and battery before anyone thought of the steering gear. Dealers fit a new steering gear assembly free. Check the VIN, and at the car, engine running and stopped, turn lock to lock and listen for a grind or a step change in effort.

Repair cost: $0 with the recall — verify it was performed

Source: NHTSA complaints filed under steering (3); 2 NHTSA recall campaigns on this model year.

8-speed torque-converter shudder at 42–48 mph; rear differential bearings fail and growlHigh — wallet impact

Six POWER TRAIN complaints in two groups. The first is the GM 8-speed shudder: a shake between 42 and 48 mph that feels like the transmission cannot settle on a gear, loss of power, delayed acceleration — one owner names the factory fluid as the cause, which matches GM's own fix of flushing to a revised fluid before any hardware. The second group is the rear differential: a growl from the back that got louder, and a Cadillac dealer finding the differential bearings damaged and calling for a whole new unit. Drive it at a steady 45 mph on light throttle and feel the seat; then a quiet road, radio off, and listen for a rising whine or growl behind you. Look under the back for a wet differential cover.

Repair cost (estimate): $300–$500 for the fluid exchange; $2,000–$3,500 for a torque converter; $2,500–$4,000 for a rear differential

Source: NHTSA complaints filed under the transmission and drivetrain (6).

High-pressure fuel pump can detach from its flange and leak fuel (fire recall)High — wallet impact

Recall 18V358 covers the 2018 ATS alongside the Malibu, Equinox, Terrain, Colorado and others: the high-pressure direct-injection fuel pump can come loose from its mounting flange, damage the fuel line, and leak — NHTSA lists a fire risk. Dealers replace the pump and the high-pressure pipe free; the campaign began in July 2018, so most cars had it done under the first owner, but confirm on the VIN. The two FUEL SYSTEM complaints and one POWER TRAIN filing on this year are the pump. Smell for raw fuel around the engine bay after a hot run, and look for staining on the top of the engine near the pump.

Repair cost: $0 with the recall — verify it was performed

Source: NHTSA complaints filed under the fuel system (2); 2 NHTSA recall campaigns on this model year.

CUE touchscreen spider-cracks under the glass; auto start/stop control module hard to sourceMedium

Two of three ELECTRICAL complaints are the CUE screen cracking from the inside — one while the car sat in the driveway, one on a hot day a few minutes after the air conditioning came on — and the climate controls and radio live on that screen. Dealers replace the whole unit; an independent shop fits a new digitizer for a fraction. The third complaint is a check-engine light traced to the module that controls the engine auto start/stop, with the owner told the part was on back-order for months. Look at the screen in daylight for the web pattern, press each corner, and on the test drive watch whether auto start/stop works cleanly at a light or throws a warning.

Repair cost (estimate): $300–$1,500 for the CUE unit or digitizer; $200–$600 for the start/stop module

Source: NHTSA complaints filed under electrics and electronics (3).

Airbag light from the passenger presence sensorMedium

Two AIR BAGS complaints on this year, one filed after a crash, and the 2017 record spells out the fault the ATS is known for: the passenger seat's presence sensor reads wrong — a phone on the empty seat can trigger it — the airbag light comes on, and the passenger airbag is switched off until the sensor mat is replaced. Same seat in 2018. Watch the light go out after the start-up bulb check, then set a phone on the passenger seat and see whether the indicator flips; have someone sit down and confirm it changes state.

Repair cost (estimate): $300–$1,200

Source: NHTSA complaints filed under airbags (2).

Walk-Away Red Flags

✗'Service Power Steering' message or a wheel that goes heavy during the drive
✗Grind or a step change in effort turning lock to lock at a standstill
✗Shudder through the seat at a steady 42–48 mph on light throttle
✗Growl or whine from the rear that rises with road speed
✗Spider-web cracking visible under the touchscreen glass
✗Either recall (25V175 steering, 18V358 fuel pump) open on the NHTSA VIN lookup

Good Signs

✓Both recalls shown closed on the NHTSA VIN lookup, the steering one dated 2025 or later
✓Steering gear replaced on a dealer invoice
✓Transmission fluid exchanged to GM's revised fluid, with a receipt
✓Rear differential replaced or its fluid changed, with the cover dry underneath
✓CUE unit or digitizer replaced, every corner of the screen responding at the car
✓Steady, quiet 45-mph cruise on light throttle with the seat still under you