Peterbilt VIN Decoder — Free Character-by-Character Breakdown for Any Peterbilt.
Every Peterbilt — every 579, 389, 567, 520, and 337 — leaves the PACCAR factory with a 17-character VIN split into three blocks: WMI (world manufacturer identifier), VDS (vehicle descriptor section), and VIS (vehicle identifier section). Heavy trucks have used the 17-character VIN standard since 1981, just like passenger vehicles. A Peterbilt VIN decoder walks each character and translates it. PACCAR Peterbilt WMIs are distinctive: 1XP, 2XP, 1NP, and 3BP. As the sister brand to Kenworth, Peterbilt shares PACCAR's engine lineup. Positions 4-8 encode the diesel engine (PACCAR MX-13, PACCAR MX-11, or Cummins X15), the GVWR weight class, and the cab configuration — day cab vs sleeper. Enter any Peterbilt VIN below.
Free Peterbilt VIN Decoder — Character-by-Character Breakdown
Enter a Peterbilt VIN and we'll walk each of the 17 characters — WMI, VDS with diesel/GVWR/cab codes and check digit, VIS with model year and plant — instantly.
Free · No sign-up · Instant breakdown
Quick Answer
- How do I decode a Peterbilt VIN?
- Find the 17-character VIN on the driver-side dash, driver door jamb, the frame rail near the front axle, title, or insurance card and enter it in CarCheckerVIN's free Peterbilt VIN decoder. It splits the string into WMI (positions 1-3), VDS (4-9 with the check digit at 9), and VIS (10-17, with model year at 10 and plant at 11) — and it identifies the PACCAR diesel engine, GVWR weight class, and cab configuration.
- What does each character of a Peterbilt VIN mean?
- Position 1 encodes country (1/2/3 = North America built). Positions 2-3 identify the manufacturer (XP/NP/BP = PACCAR Peterbilt truck). Positions 4-8 describe the diesel engine (PACCAR MX-13, MX-11, or Cummins X15), the GVWR weight class, and cab style (day cab vs sleeper); 9 is check, 10 year, 11 plant, 12-17 serial.
- Is Peterbilt VIN decoding free?
- Yes. CarCheckerVIN's Peterbilt VIN decoder is free with no credit card. Every 17-character breakdown returns WMI, VDS, and VIS split plus decoded year, PACCAR diesel engine, GVWR class, cab configuration, axle setup, and factory.
What a Peterbilt VIN Decodes
The 17 characters of a Peterbilt VIN encode six distinct pieces of data — from the country of build to the sequential production serial — plus PACCAR-specific diesel engine, GVWR weight class, and cab detail. Every Peterbilt decoder returns each of these data points from the VIN alone.
Country of origin (position 1)
The first character encodes country of manufacture. Peterbilt VINs starting with 1, 2, or 3 were built in North America. Peterbilt assembles trucks in Denton, Texas in the US, plus Ste-Thérèse, Quebec, Canada, and Mexicali, Mexico. The leading digit is the primary decision point for build country.
Manufacturer (positions 2-3)
The second and third characters encode PACCAR's Peterbilt division and truck class. 1XP, 2XP, 1NP, and 3BP are among the common Peterbilt WMIs. The combination with position 1 forms the full WMI that identifies the truck as a PACCAR Peterbilt product — distinct from sister brand Kenworth, which uses 1XK and 1NK.
Diesel engine + GVWR + cab (positions 4-8)
This is where heavy-truck VINs differ from passenger cars. Positions 4-8 encode the diesel engine — the PACCAR MX-13, the smaller PACCAR MX-11, or the Cummins X15 — plus the GVWR weight class and the cab configuration (day cab vs sleeper) and axle arrangement. The decoder maps the VDS to the specific engine family and cab style.
Model year (position 10)
The tenth character is the model year. Peterbilt uses the same universal year code as every other manufacturer: L = 2020, M = 2021, N = 2022, P = 2023, R = 2024, S = 2025, T = 2026. The decoder converts the letter into the actual model year.
Assembly plant (position 11)
The eleventh character is the specific assembly plant. Peterbilt builds trucks at Denton, Texas; Ste-Thérèse, Quebec; and Mexicali, Mexico. The plant code combined with the WMI tells you exactly where the 579, 389, or 567 was assembled.
Unique serial (positions 12-17)
The last six characters form the unique production serial — sequential within a plant, within a model year. On fleet trucks the serial is used to match units to spec sheets, warranty records, and build orders — critical when managing a mixed Peterbilt 579/389 fleet.
Full Peterbilt VIN Character-by-Character Table
Every 17-character Peterbilt VIN follows the same universal structure: three-character WMI, six-character VDS ending in a check digit, and eight-character VIS starting with model year. The table below walks every position with a Peterbilt-specific example. The sample VIN we decode is 1XPBDP9X5LD123456 — a 2020 Peterbilt 579 sleeper tractor with a PACCAR MX-13 diesel and a Class 8 GVWR rating, built by PACCAR in North America.
Example Peterbilt VIN
| Position | What it means universally | Peterbilt example |
|---|---|---|
1 | Country of origin | 1 = USA (Denton, Texas); 2 = Canada (Ste-Thérèse); 3 = Mexico (Mexicali) |
2-3 | Manufacturer (with pos 1 forms WMI) | XP = PACCAR Peterbilt truck (1XP WMI) |
3 | Vehicle type/class (rolled into WMI) | P in 1XP = Peterbilt heavy-truck line (vs 1NP / 3BP) |
4-8 | Vehicle attributes (VDS): diesel engine, GVWR weight class, cab (day vs sleeper) | BDP9X = Class 8 tractor, PACCAR MX-13 diesel, sleeper cab |
9 | Check digit — math-verified against positions 1-8, 10-17 | 5 in this VIN — verifies the whole string is valid |
10 | Model year | L = 2020 (M=2021, N=2022, P=2023, R=2024, S=2025, T=2026) |
11 | Assembly plant | D = Peterbilt plant code (Denton, TX / Ste-Thérèse / Mexicali) |
12-17 | Unique production serial | 123456 — sequential; fleets match units to build orders |
Where to Find Your Peterbilt VIN
Peterbilt prints the VIN in at least five places on every modern truck. Any one of them is enough to run a free Peterbilt VIN decode — and if any of them disagree with each other, that is a strong signal the truck's identity has been tampered with.
The fastest place to find a Peterbilt VIN is the driver-side dash where it meets the windshield. The driver door jamb is the second-easiest place; Peterbilt includes it as required by federal law, along with the GVWR and tire rating. The frame rail near the front axle carries a stamped VIN as well, and the title document and the insurance ID card both print the VIN.
On heavy trucks the frame-rail stamping is the tamper-resistant reference — fleets and inspectors verify it against the dash and door-jamb plates. For the cleanest read, copy the VIN directly from the door jamb, then confirm it matches the frame rail.
Five places the Peterbilt VIN lives
- Driver-side dash at the windshield (visible from outside)
- Driver door jamb (also lists GVWR and tire rating)
- Frame rail stamped near the front axle
- Insurance ID card
- Peterbilt title document
Found it? Drop the 17-character Peterbilt VIN into the form above and decode every position in seconds.
Decode Your Peterbilt VIN Right Now
Got a Peterbilt in mind — yours, or one you're about to buy? Break every one of the 17 characters into plain English — WMI, VDS with diesel+GVWR+cab codes, VIS — free, in seconds.
Common Peterbilt Issues Revealed by VIN
Once the VIN is decoded, the same 17-character string can be queried against Peterbilt recall data. Three problem categories appear more often than any others on used Peterbilt trucks — the decoder gives you the year, diesel engine variant, and plant to know whether your Peterbilt is likely in scope.
Steering column recalls
Peterbilt 579 and 567 tractors have had steering-column and steering-shaft recalls on certain builds. Positions 4-8 encode the GVWR class and axle configuration — decode those characters to identify the chassis before you query recall status. PACCAR Peterbilt performs the remedy at no charge.
Brake system recalls
Air-brake valve, ABS module, and brake-line recalls have affected various Peterbilt model years. The decoded VIN's model year at position 10 tells you whether the recall window applies before you even query it — pair the decode with a live recall check for the definitive answer.
Wiring and electrical recalls
Certain Peterbilt models had wiring-harness and electrical-fault recalls. Positions 10 (year) and 11 (plant — Denton vs Ste-Thérèse vs Mexicali) narrow down whether the affected build applies — decode those characters, then confirm against the live NHTSA recall feed for your exact VIN.
Decoded a used Peterbilt? Pair this decoder with a focused recall check and an accident history check for a complete picture before you put money down.
Peterbilt VIN Decoder vs Manufacturer's Own Tool
Peterbilt operates dealer portals and the PACCAR build-spec system as its official service channels, and they include VIN-based build and service lookups. But they are not a full public VIN decoder in the industry sense. The manufacturer's tools are gated behind dealer or fleet-account access, and they do not walk the 17 characters position-by-position. Compare that to CarCheckerVIN's Peterbilt VIN decoder, which is public, requires no sign-up, breaks every position out in a labelled table (including the diesel engine + GVWR class + cab detail), and adds NMVTIS title-brand data on top.
The gap widens on title brands. The manufacturer's tools never surface salvage, junk, or total-loss titles from any state — and heavy trucks frequently carry title brands after collision or fleet write-offs. That data lives in NMVTIS, which our free Peterbilt VIN check queries alongside the decoder. For a complete picture, decode the VIN here and pair the output with a full VIN history report if the numbers give you any pause.
The right call: use the decoder for character-level truth (year, plant, PACCAR diesel engine, GVWR, cab), and use the lookup for lived history (recalls, titles, salvage). Both are free on CarCheckerVIN.
Peterbilt decoder vs manufacturer tool
- Decodes all 17 charactersOurs: YesOEM: No
- Public, no sign-upOurs: YesOEM: No
- Shows open recallsOurs: YesOEM: Yes
- Shows title brandsOurs: YesOEM: No
- Shows NMVTIS salvageOurs: YesOEM: No
- Cross-brand supportOurs: YesOEM: No
Decode a Peterbilt VIN here — no sign-up:
Related VIN Tools for Peterbilt Owners
A Peterbilt VIN decoder is the character-level view. These sibling tools add the lived history, dedicated recall data, and paint-code intent — all queried by the same VIN.
Always check the VIN before you buy
Our free report reveals accidents, title brands, odometer rollback, theft records, and open recalls in seconds.
Peterbilt VIN Decoder — Frequently Asked Questions
The questions Peterbilt owners and used-truck buyers ask most when they want to decode a Peterbilt VIN character by character.
How do I decode a Peterbilt VIN?+
To decode a Peterbilt VIN, find the 17-character VIN — typically on the driver-side dash at the windshield, the driver door jamb, the frame rail near the front axle, the title document, or the insurance card — and enter it into the free Peterbilt VIN decoder form on this page. The tool validates the format and excludes I, O, and Q, then splits into WMI (positions 1-3), VDS (positions 4-9 with the check digit at 9), and VIS (positions 10-17). Every character is labelled, and the PACCAR diesel engine code, GVWR weight class, and cab configuration are extracted from the VDS. Decoded output rolls up to year, model, diesel engine, GVWR class, cab style, and factory.
What does the 10th character of a Peterbilt VIN mean?+
The 10th character of a Peterbilt VIN is the model year — universal across every automaker and truck maker, not specific to Peterbilt. The letters skip I, O, Q, U, Y and the digits 0 and Z to avoid ambiguity. The current cycle: J = 2018, K = 2019, L = 2020, M = 2021, N = 2022, P = 2023, R = 2024, S = 2025, T = 2026. So a Peterbilt 579 VIN with L at position 10 is a 2020 model. This is the fastest single-character check to confirm the model year of any Peterbilt.
What does the 11th character of a Peterbilt VIN mean?+
The 11th character of a Peterbilt VIN encodes the specific assembly plant. Peterbilt builds trucks at Denton, Texas; Ste-Thérèse, Quebec; and Mexicali, Mexico. Two Peterbilt trucks with the same year and model can carry different plant codes depending on where they were assembled — the plant code combined with the WMI at positions 1-3 confirms the exact build location.
Where is the check digit in a Peterbilt VIN?+
The check digit in a Peterbilt VIN — like every 17-character VIN — is at position 9. It is a math-verified digit calculated from the other 16 characters using a weighted formula defined by NHTSA. The check digit is 0-9 or the letter X. If a VIN is transcribed with a typo, the check digit no longer matches — the decoder flags the mismatch as invalid. This is especially useful when copying long fleet-truck VINs from paper build sheets or bills of sale.
Can I decode a pre-1981 Peterbilt VIN?+
No — the 17-character VIN standard was introduced by the US government in 1981, and heavy trucks adopted it at the same time as passenger vehicles. Peterbilt VINs from 1980 and earlier are shorter and follow a different structure. For pre-1981 classic Peterbilt conventionals and cabovers (the 359 and earlier), the serial-number plate is the reliable source. Every Peterbilt from 1981 forward has a full 17-character VIN and can be decoded here — including the 579, 389, 567, 520, and 337.
What's the difference between decoding and looking up a Peterbilt VIN?+
Decoding a Peterbilt VIN reads the 17-character string itself — country, manufacturer, class, diesel engine, GVWR weight class, cab configuration, check digit, model year, plant, and serial — using only the rules of the VIN standard. Looking up a Peterbilt VIN queries external databases against that same VIN — NMVTIS for title brands (salvage, junk, total-loss common on heavy trucks), NHTSA for open recalls, state DMVs for the title chain. Decoding tells you what the truck is; looking up tells you what has happened to it.
Is the Peterbilt VIN decoder free?+
Yes. The Peterbilt VIN decoder on this page is free, with no sign-up, no credit card, and no hidden charges. You enter the 17-character Peterbilt VIN and we return the full character-by-character breakdown — WMI at positions 1-3, VDS at positions 4-9 with the check digit at 9 (and the PACCAR diesel engine + GVWR class + cab attributes decoded from those characters), VIS at positions 10-17 with model year at 10 and plant code at 11 — plus the decoded year, model, diesel engine, and factory. The VIN standard is a public specification, which is why a decoder can be free.
Ready to Decode a Peterbilt VIN?
Enter any 17-character Peterbilt VIN to break every position into plain English — WMI, VDS with diesel + GVWR + cab codes and check digit, VIS with model year and plant — instantly.
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