2018 Chevrolet

Sonic

Auto (S6), 4 cyl, 1.8 L

Chevrolet Sonic: best and worst years

Overview

Body: Compact CarsEPA, from EPA, last updated 6/11/2026
Drivetrain: Front-Wheel DriveEPA, from EPA, last updated 6/11/2026
Transmission: Automatic (S6)EPA, from EPA, last updated 6/11/2026
Powertrain: GasEPA, from EPA, last updated 6/11/2026
Fuel: RegularEPA, from EPA, last updated 6/11/2026

Engine & performance

HP: 138
Power to weight: 0.050 hp/lb
Axle ratio: 3.47
Cyl: 4EPA, from EPA, last updated 6/11/2026
Aspiration: Naturally aspiratedEPA, from EPA, last updated 6/11/2026
Start-stop system: NoEPA, from EPA, last updated 6/11/2026

Efficiency

MPG Hwy: 34 mpgEPA, from EPA, last updated 6/11/2026
MPG City: 25 mpgEPA, from EPA, last updated 6/11/2026
MPG Comb: 28 mpgEPA, from EPA, last updated 6/11/2026
Fuel $/yr: $2,200EPA, from EPA, last updated 6/11/2026
CO₂: 311 g/miEPA, from EPA, last updated 6/11/2026
Eco Score: 6/10EPA, from EPA, last updated 6/11/2026
Smog score: 5/10
Elec. Range: 0 miEPA, from EPA, last updated 6/11/2026
SmartWay certified: No

Dimensions & capacity

Length: 160 inNHTSA vPIC, from NHTSA vPIC, last updated 6/4/2026
Width: 69 inNHTSA vPIC, from NHTSA vPIC, last updated 6/4/2026
Height: 60 inNHTSA vPIC, from NHTSA vPIC, last updated 6/4/2026
Wheelbase: 99 inNHTSA vPIC, from NHTSA vPIC, last updated 6/4/2026
Curb Weight: 2,784 lbNHTSA vPIC, from NHTSA vPIC, last updated 6/4/2026
Pass. Vol: 91 ft³EPA, from EPA, last updated 6/11/2026
Cargo Vol: 12 ft³EPA, from EPA, last updated 6/11/2026

Safety NHTSA, model year

Overall crash rating: ★★★★★
Rollover rating: ★★★★★
Stability control (ESC): Standard
Forward-collision warning: Optional
Lane-departure warning: Optional
Recalls: 1
Owner complaints: 14

Feature availability

Which features come standard, cost extra, or are locked to a pricier trim arrives with the next data phase. Standard equipment shows here today.

Standard

Reported problems NHTSA owner complaints, model year

ELECTRICAL SYSTEM22%
ENGINE17%
SEATS9%
UNKNOWN OR OTHER9%
WHEELS9%
AIR BAGS4%

Source: NHTSA owner complaints, 23 total.

Chevrolet Sonic: best and worst years

Warranty manufacturer terms, by make

Basic: 3 yr / 36k mi
Powertrain: 5 yr / 60k mi
Roadside assistance: 5 yr / 60k mi
Maintenance: 1 yr / 12k mi
EV battery: 8 yr / 100k mi

Information is gathered on a best-effort basis from public sources, may be incomplete or out of date, and is not purchasing or financial advice. Verify with the manufacturer or dealer before buying.