Factory build sheet

2021 Ram 1500 BIG Horn, Lonestar

Build 1C6RREBM-M · 3L 6cyl · Pickup

VIN positions 1 through 8 read 1C6RREBM and position 10 reads M. Those nine characters define this build. Position 9 and positions 11 through 17 differ on every car.

Every 1500 whose VIN starts 1C6RREBM and carries M in position 10 left the plant with the same engine, transmission, drivetrain and equipment listed below. We know of 81 of them.

  • Decoded Jul 7, 2026
  • 81 known VINs

This configuration is identical to 2021 Ram 1500 BIG Horn, Lonestar 3L 6cyl Pickup (882 vehicles). That page carries the full record.

Factory specification

As filed by Ram 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
3 L
Cylinders
6
Configuration
V-Shaped
Engine model
260 hp 3l v6 biodiesel
Engine manufacturer
FCA
Turbocharged
Yes
Horsepower
260 hp
Fuel type
Diesel

Drivetrain

Drive type
4x2
Brake system
Hydraulic

Body & chassis

Body class
Pickup
NHTSA body type
TRUCK
Cab type
Extra/Super/Quad/Double/King/Extended
Manufacturer
FCA US LLC

Weight rating

GVWR class
Class 2E
GVWR
6,001–7,000 lb

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

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 1C6 FCA US LLC · World manufacturer identifier
4–8 RREBM 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

NHTSA safety ratings

Crash-test results are published per model year and body style, so they cover the 2021 Ram 1500 as a whole rather than this build alone.

Overall

★★★★★ 5 / 5

Frontal crash

★★★★ ★ 4 / 5

Side crash

★★★★★ 5 / 5

Rollover

★★★★ ★ 4 / 5

15 recall campaigns are recorded for the 2021 1500. Recalls are issued per VIN range — check the VIN of the car you are looking at, not the model.

81 vehicles carry this build

Every VIN we have decoded to 1C6RREBM-M shares the specification above.

  • 81 Known VINs

Neighboring configurations

Other factory configurations of the 1500, each with its own build sheet. The set is fixed by the VIN patterns themselves, so it does not shuffle as prices or inventory move.

Keep going

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 81 VINs of this build we have seen in dealer inventory. They are a sample of the road population, not a production figure.