Ram 1500 VIN Decoder: Trim, Engine and Plant by Position

To decode a Ram 1500 VIN, focus on characters 5 through 8. On the current truck, RE means 2WD and RF means 4WD, the seventh character is the cab and trim (RFU on a 2026 is the RHO, RFL is a Rebel), and the eighth is the engine: P for the 3.0L turbo inline-six, G for the 3.6L V6, T for the 5.7L V8. The tenth character is the model year and the eleventh is the plant. Codes get reused between years, so the same letters can mean different trucks, and that is exactly how a Big Horn ends up advertised as a Laramie.

FCA US, now part of Stellantis, publishes a VIN code guide with NHTSA for every model year. On November 8, 2026 I went through two of them line by line: the 2022 Truck/MPV guide dated September 28, 2021, and the 2026 guide dated September 15, 2025. Those two bracket most Ram 1500s you will find on a lot right now, and comparing them shows where the traps are.

The first four characters: who built it and how heavy it is

The world manufacturer code on a Ram 1500 is usually 1C6, which FCA's guides list as FCA US LLC, truck. A 3C6 prefix means FCA Mexico built it, and the 2022 guide also lists 2C6 for FCA Canada. Position 4 combines the restraint package and the GVWR. On both guides, R means a 6,001-7,000 lb GVWR and S means 7,001-8,000 lbs, in each case with front airbags and side airbags for all rows. The 2022 sheet has a whole grid of letters for other restraint combinations, but a light-duty Ram 1500 with side curtains will almost always show R or S here.

Characters 5-7: drive, cab and trim

This is where FCA packs in the details. On the 2022 guide, the current-generation truck (FCA's DT platform) uses RE for 2WD and RF for 4WD. The seventh character then picks the cab and series:

• Quad Cab: A is HFE (2WD only), B is Big Horn/Lone Star, C is Tradesman, D is Laramie, W is Sport (Canada), and RFE is the Rebel (4WD only).
• Crew Cab short bed: X is HFE, F is Big Horn/Lone Star, G is Tradesman, H is Limited, J is Laramie, K is Longhorn, L is Rebel, V is Sport (Canada), and RFU is the TRX.
• Crew Cab long bed: M is Big Horn/Lone Star, N is Tradesman, P is Limited, plus a Laramie code.

The old-body Ram 1500 Classic (DS) shares the guide but uses different prefixes: R6 for 2WD and R7 for 4WD, with A through T covering regular, quad and crew cabs in Tradesman and SLT trims, and R7X for the SSV. So if a listing calls a truck a new-body Big Horn and characters 5-6 read R7, you are looking at a Classic.

Then compare the 2026 guide. RE and RF still mean 2WD and 4WD, and many letters carry over, but some do not. RFK is now the Tungsten, where it used to be the Longhorn. RFU is now the RHO, where it used to be the TRX. A chart pasted from a 2022 forum thread will get those wrong on a 2026 truck, and a seller who wants Tungsten money for a lesser truck is counting on you not checking.

Character 8: the engine

On the 2022 guide, the Ram 1500 had four engine codes: M for the 3.0L turbodiesel V6 (260 hp), G for the 3.6L V6 (305 hp), T for the 5.7L V8 (395 hp), and 9 for the supercharged 6.2L V8 (702 hp) in the TRX. The Ram 1500 Classic listed G and T at 291 and 391 hp.

By 2026 the lineup had changed. FCA lists P for a 3.0L turbocharged inline-six rated at 420 hp, or 540 hp in the Limited, Tungsten and RHO, G for the 3.6L V6 at 305 hp, and T for the 5.7L V8 with horsepower still marked "TBD" on that September 2025 sheet. Federal VIN rules only require encoded horsepower to land within 10 percent of the real figure, so use the eighth character to confirm the engine family, not to settle a dyno argument. Diesel shoppers should also read our EcoDiesel emissions fix check, because a 2022 M-code truck carries its own baggage.

Characters 9-11: check digit, year and plant

The ninth character is a check digit calculated from the other sixteen, which is a quick way to catch a typo or a sloppy fake VIN. The tenth is the model year, with N for 2022 and T for 2026. The eleventh is the assembly plant. FCA's 2022 truck guide lists every plant for its truck and MPV lineup, including N for Sterling Heights Assembly and S for Warren Truck Assembly, both in Michigan. The 2026 Ram 1500 page narrows it to N for Sterling Heights and 4 for the Saltillo Truck Extension Plant in Coahuila, Mexico. The last six characters are the plant sequence number.

What to do with the decode

So you have the VIN and the ad. Match the VIN on the dash, the door jamb and the title first; a mismatch there outranks every trim question. Then check the seventh and eighth characters against what the seller claims, and pull the window sticker if a pricey package is part of the asking price. Our Ram VIN decoder overview covers the brand basics, why free decoders show the wrong trim explains a common mix-up, and the used Ram 1500 buying guide covers mechanicals.

Run the VIN through NHTSA's recall lookup too. It lists unrepaired safety recalls only, and it will not show non-safety service campaigns or recalls more than 15 years old. Our GVWR and towing guide explains why that fourth character matters if you plan to pull a camper.

For the truck's life story, CarVins resells official CARFAX and AutoCheck reports under license; we have no ownership link to CARFAX, AutoCheck or Experian. Edmunds found CARFAX charging $44.99 and AutoCheck $29.99 for one report in June 2026. Our prices undercut both, though they can change, so confirm at checkout. A free VIN decode will never show a flood brand or a buyback, and Rams get both.

Sources

• FCA US 2022 Truck/MPV VIN Code Guide, September 28, 2021 (NHTSA vPIC MID)
• FCA US 2026 VIN Code Guide, September 15, 2025 (NHTSA vPIC MID)
• Federal VIN format rule, 49 CFR 565.15
• NHTSA recall search (unrepaired safety recalls)
• Edmunds comparison of CARFAX and AutoCheck prices