Factory build sheet

2021 Cadillac CT4 Premium Luxury Special Edition

Build 1G6D55RL-M · 2.7L 4cyl · All-wheel drive · Sedan

VIN positions 1 through 8 read 1G6D55RL and position 10 reads M. Those nine characters define this build. Position 9 and positions 11 through 17 differ on every car.

Every CT4 whose VIN starts 1G6D55RL and carries M in position 10 left the plant with the same engine, transmission, drivetrain and equipment listed below. We know of 18 of them.

  • Decoded Jul 7, 2026
  • 18 known VINs

Factory specification

As filed by Cadillac with NHTSA for this build. Fields the filing does not record are left out entirely — a missing row means no recorded value, not a missing feature.

Engine

Displacement
2.7 L
Cylinders
4
Configuration
In-Line
Engine model
L3B
Valve train
Dual Overhead Cam (DOHC)
Turbocharged
Yes
Fuel type
Gasoline

Drivetrain

Drive type
All-wheel drive
Transmission
Automatic
Forward speeds
8

Body & chassis

Body class
Sedan/Saloon
NHTSA body type
PASSENGER CAR
Doors
4
Seats
5
Seat rows
2
Manufacturer
GENERAL MOTORS LLC

Weight rating

GVWR class
Class 1
GVWR
6,000 lb or less

Gross vehicle weight rating is the loaded ceiling set by the manufacturer, not the car's own weight.

Driver assistance, as built

  • Forward collision warning Standard
  • Adaptive cruise control Optional

Systems the filing does not record are not listed above. Check the window sticker of the exact car before you rely on any single feature.

The same build, other model years

Cadillac used the VIN pattern 1G6D55RL for 2 model years. Nothing but the year changes between these pages, so the price gap between them is depreciation on an identical car.

How this VIN pattern is read

A 17-character VIN carries two kinds of information: what was built, and which one it is. This page is the first kind — the nine highlighted positions.

Positions Characters What they encode
1–3 1G6 GENERAL MOTORS LLC · World manufacturer identifier
4–8 D55RL Model, body style, engine and restraint system
9 × Check digit — computed per vehicle, not part of the build
10 M Model year — 2021
11 × Assembly plant
12–17 ×××××× Production sequence number, unique to each vehicle

18 vehicles carry this build

Every VIN we have decoded to 1G6D55RL-M shares the specification above.

  • 18 Known VINs

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Where this data comes from

Specification fields are decoded from the manufacturer's filings in the NHTSA vPIC database, keyed on VIN positions 1–8 and 10. We publish the filed values as they stand and leave out anything the filing does not record.

Vehicle counts come from the 18 VINs of this build we have seen in dealer inventory. They are a sample of the road population, not a production figure.