Buyer Research

2018 Chevrolet Impala — Should You Buy One?

Typical asking price: $12,000–$18,000. There is 1 high-severity known issue you need to know before handing over a check.

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Kestrel Take

Fifty-nine complaints is a thin record, and a thin record is not a reliability rating — it says the 2018 Impala sold in small numbers to owners who mostly did not file, not that the car is clean. What is on file is worth reading anyway. One recall, and it is a brake one: rear caliper pistons that can trap gas and give a long, soft pedal, and five of the eight brake complaints are crashes where the pedal went to the floor. Eleven owners describe the six-speed hesitating, shuddering or getting stuck in gear, with one $8,200 repair. The electrical cluster is mostly a weak battery and the stop-start system shutting the whole car off at a light. Confirm the brake recall on the VIN, test the pedal hard in a parking lot, and drive it long enough for the auto-stop to cycle. Do that and this is a comfortable, well-equipped big car with a long dealer network behind it.

What we checked

Reconciled against public records, 2026-09-25

NHTSA holds 59 owner complaints for the 2018 Chevrolet Impala, and 1 recall campaign.

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 19%. That is notable without being overwhelming — worth checking, not worth panicking about.

One recall campaign covers 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 Chevrolet Impala

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

Rear brake caliper pistons can trap gas — soft or long pedal and reduced braking (recall 18V576)High — wallet impact

Recall 18V576 covers the 2018 Impala among a list of GM cars: the rear caliper pistons may have an insufficient coating, which lets hydrogen gas form in the brake fluid, and the result is a spongy pedal and less braking than the driver expects. GM's remedy is a full brake bleed, free. It matters here because five of the eight brake complaints on this year are crashes — a pedal that went to the floor in a parking lot, a car that slid into the one ahead at 50 mph, one that would not stop while reversing. Look the VIN up on NHTSA, then in an empty lot from 25 mph stand on the pedal: it should be firm and the car should stop hard and straight. A pedal that sinks slowly at a standstill is fluid or a master cylinder, and a walk-away until fixed.

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

Source: NHTSA complaints filed under the brakes (8); 1 NHTSA recall campaign on this model year.

Six-speed automatic hesitates, shudders and gets stuck in gear — an $8,200 bill in one reportMedium

Eleven power train complaints, the largest share of this small record. Owners describe a hesitation and shake through the whole car when accelerating, the transmission holding a low gear and slowing the car to a crawl uphill, a shifter that seems to jump to Park and back, and a pedal that gave nothing at 45 mph. One owner was quoted $8,200 for a transmission. Burst transmission cooler lines show up too. We rate it medium because eleven reports is not a pattern proven across the fleet, but the repair, when it comes, is four figures. On the test drive, use Manual mode to hold third and fourth and feel for shudder under light throttle at 35–45 mph, then check the fluid for a burnt smell if the dipstick is accessible.

Repair cost (estimate): $300–$5,000 — about 33% of what this car is typically worth

Source: NHTSA complaints filed under the transmission and drivetrain (11).

Weak battery takes everything down — auto-stop kills the car, StabiliTrak cascade, hard steering, dead TPMS receiverMedium

The electrical cluster here reads as a low-voltage story. The 2018 3.6L has automatic stop-start, and one owner describes the auto-stop shutting the entire car off at stop signs after an hour of driving, restarting with a hard jerk into gear — the dealer's answer was the battery. Others describe a jerk with StabiliTrak, ABS and check-engine lights together and then a total loss of engine power, and one lost steering assist on the way home from work. A tyre-pressure receiver that stopped reading the sensors is in there too. The AGM battery these cars use is $250–$400 and a quick load test tells you its state; a car that has been sitting on a dealer lot is the one most likely to fail it.

Repair cost (estimate): $150–$450 for a battery and terminals; more if the steering module has actually failed

Source: NHTSA complaints filed under electrics and electronics (11).

Walk-Away Red Flags

✗Brake pedal that sinks slowly with steady pressure at a standstill
✗Shudder through the car under light throttle between 35 and 45 mph
✗Auto-stop that restarts with a bang, or fails to restart at all
✗StabiliTrak or ABS lights flickering when the engine restarts
✗Battery with a date code more than four years old

Good Signs

✓Recall 18V576 shown closed on the NHTSA VIN lookup or a dealer printout
✓A firm pedal and a straight, hard stop from 25 mph in an empty lot
✓Fresh AGM battery with a receipt and a passing load test
✓Transmission fluid changed with a receipt, or a documented dealer transmission repair
✓Auto-stop cycling smoothly at three consecutive traffic lights