Buyer Research

2018 Cadillac CTS — Should You Buy One?

Typical asking price: $18,000–$27,000. There is 1 high-severity known issue you need to know before handing over a check.

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Kestrel Take

Eight complaints is not a reliability rating; it is eight people. The 2018 CTS is the same third-generation car as the 2017 — 2.0T, 3.6L, Vsport and the 640-hp V, all on the eight-speed — and it shares the 2017's two real problems whether or not many 2018 owners wrote to NHTSA: an electric power steering gear that can quit, recalled in 2019 and again in 2025, and a rear differential that leaks and then fails, here confirmed by a dealer at 41,000 miles with a three-to-six-month wait for parts. Run the VIN for both steering campaigns, look under the back for a wet differential, feel for the eight-speed shudder on a light throttle at 50–60 mph, and press every corner of the CUE screen. That is the whole inspection this record supports, and it is worth doing before you pay near-new money for one.

What we checked

Checked against public records, 2026-09-25

NHTSA holds 8 owner complaints for the 2018 Cadillac CTS, and 2 recall campaigns.

That is too small a record to read a pattern from, so we are not going to pretend otherwise — with numbers this low one owner moves the percentage by a lot. What has been filed is grouped under the transmission and drivetrain (3), electrics and electronics (3), airbags (1). Treat those as things to look at, not as the vehicle's known weaknesses. A thin file usually means few of these were sold or few owners filed. It is not evidence the vehicle is trouble-free, and the issues below are our own research rather than a reading of this record.

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 CTS

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

Electric power steering assist can fail — two recalls, 2019 and 2025High — wallet impact

Recall 19V086 covered 2016–2018 CTS for an electric power steering system that may lose assist, replacing the steering gear free; recall 25V175 reopened the same fault in 2025 with the same remedy and owner letters mailed April 15, 2025. A loss of assist at low speed means a wheel that suddenly takes both arms in a car park or a turn. Nobody in this small record filed a steering complaint, which is a fact about the record, not the part — the 2017 CTS page carries eight. A seller who says the steering recall was done may mean only the 2019 one, so check both campaign numbers on the VIN, then do a slow full-lock turn each way and feel for the assist dropping.

Repair cost: $0 with the recall — verify it was performed; $1,500–$2,800 for a steering gear outside the recall

Source: 2 NHTSA recall campaigns on this model year.

Rear differential fails after a leak and a rising noise; the eight-speed shudders and shifts roughMedium

Two of the three powertrain complaints are the two faults that run through the whole third-generation CTS. One is the rear differential: a fluid leak, then two days of loud noise from the back, then a dealer confirming failure at 41,000 miles and warning that the rear wheels could lock — under warranty, but with parts three to six months out. The other is the GM eight-speed: a shudder on a light throttle at 50–60 mph and jerky shifts, which GM's service bulletin treats with a fluid exchange and which became a class action across its 8L45 and 8L90 cars. We rate this medium on the 2018 only because eight complaints cannot establish a pattern on their own; the part and the bill are identical to the 2017, where we rate it high. Check under the rear for a wet pinion housing and drive it at 50–60 mph with the radio off.

Repair cost (estimate): $300–$700 to reseal or $1,800–$4,200 for a differential; $250–$500 for the transmission fluid exchange, $1,500–$3,000 for a torque converter

Source: NHTSA complaints filed under the transmission and drivetrain (3).

Auto stop/start that fails and stalls the car; CUE screen crazing in a spiderweb patternMedium

Three electrical complaints, three different things. One owner's automatic stop/start failed three times, leaving the car stalled at a stop instead of restarting — on this car the usual suspects are a tired AGM battery or the auxiliary battery the system relies on, both a few hundred dollars. Another found web-like cracks appearing on the right side of the CUE display on a car that was mostly parked in shade, the delamination the 2014–2018 CUE unit is known for; digitizer replacement is cheap aftermarket and dear at the dealer. Test the stop/start at three or four traffic lights and look at the screen against a dark background.

Repair cost (estimate): $200–$500 for a battery; $300–$1,200 for the CUE screen

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

Walk-Away Red Flags

✗Either steering recall shown open on the NHTSA VIN lookup
✗Wet pinion housing or drips under the rear differential, or a hum that rises with speed
✗Shudder or jerk on a light throttle at 50–60 mph
✗Engine that stays off at a light and has to be restarted with the key
✗Spiderweb cracking on the CUE screen

Good Signs

✓Recalls 19V086 and 25V175 both shown closed on the VIN
✓Rear differential resealed or replaced with a dated invoice
✓Transmission fluid exchanged under the shudder bulletin, with the receipt
✓Stop/start restarts the engine cleanly at every light on the test drive
✓A dry differential housing and a quiet run at 50–70 mph