A Peterbilt 379 VIN is 17 characters. Positions 1–3 say who built it and where, 4–8 describe the body and engine, 9 is a check digit, 10 is the model year, 11 is the plant, and 12–17 are the serial number. Decode a 379 VIN here and you also get its 80 recall campaigns and 36 owner complaints filed with NHTSA — free.
How to read a Peterbilt 379 VIN
Here is a real 2007 Peterbilt 379 VIN from our database, split into its parts:
VIN 1XP5DB9X67D748503 — decoded free on its own report page.
| Position | Section | What it tells you |
|---|---|---|
| 1–3 | WMI | World Manufacturer Identifier — country, manufacturer and vehicle type. |
| 4–8 | VDS | Vehicle Descriptor Section — body style, engine, restraint system, series. |
| 9 | Check digit | A calculated digit that validates the whole VIN. Wrong digit = wrong VIN. |
| 10 | Model year | One character for the model year. Letters skip I, O, Q, U and Z. |
| 11 | Plant | The assembly plant that built the car. |
| 12–17 | Serial | Sequential production number of this exact vehicle. |
Peterbilt 379 VIN prefixes, and when each one was used
Characters 1–3 are not fixed for the life of a model. The Peterbilt 379 ran through 2 different prefixes across 13 years — a 379 built in 1995 opens with 1XP, one from 2007 with 1NP, and a chart that assumes 379 always starts the same way will hand you the wrong car:
| VIN starts with | Years seen | Built in | Vehicle type | VINs on record |
|---|---|---|---|---|
| 1XP | 1995–2007 | United States | Truck | |
| 1NP | 2000–2007 | United States | Incomplete Vehicle |
Position 11 names the plant. On the Peterbilt 379 it is not one number either — assembly moved between 3 of them over the years:
| Plant code | Years active | VINs on record | Share |
|---|---|---|---|
| N | 1997–2007 | 17 | |
| D | 1995–2007 | 15 | |
| 4 | 1997–1998 | 2 |
Counted from the 35 dated Peterbilt 379 VINs attached to NHTSA complaints — the largest such set for this model — with every code checked against the NHTSA manufacturer registry, so mistyped entries are dropped; the figures say how many records carry each code, not how many 379s left the line.
Model-year codes for the Peterbilt 379
Position 10 carries the model year, skipping I, O, Q, U and Z. The alphabet comes round every 30 years, which for the Peterbilt 379 has already happened — 1993 and 2023 share the character P. All 34 model years of the Peterbilt 379, 1985 to 2023, with the character each one carries:
| Model year | VIN character (position 10) | Same character as |
|---|---|---|
| 2023 | P | 1993 |
| 2022 | N | 1992 |
| 2016 | G | 1986 |
| 2015 | F | 1985 |
| 2014 | E | — |
| 2013 | D | — |
| 2012 | C | — |
| 2011 | B | — |
| 2010 | A | — |
| 2009 | 9 | — |
| 2008 | 8 | — |
| 2007 | 7 | — |
| 2006 | 6 | — |
| 2005 | 5 | — |
| 2004 | 4 | — |
| 2003 | 3 | — |
| 2002 | 2 | — |
| 2001 | 1 | — |
| 2000 | Y | — |
| 1999 | X | — |
| 1998 | W | — |
| 1997 | V | — |
| 1996 | T | — |
| 1995 | S | — |
| 1994 | R | — |
| 1993 | P | 2023 |
| 1992 | N | 2022 |
| 1991 | M | — |
| 1990 | L | — |
| 1989 | K | — |
When two years share a character, the check digit and serial range tell them apart — that is what the decoder does automatically.
Body and engine characters we see on Peterbilt 379 VINs
Positions 4 through 8 describe the build, and manufacturers assign them themselves — the same letter means different things on different marques. Across 4 VINs the Peterbilt 379 uses 3 different characters in these three slots alone — the ones below, ordered by how much of the Peterbilt fleet each covers:
| Position | Characters seen on real VINs | Variety |
|---|---|---|
| 4 — body | 5 (100%) | 1 distinct |
| 5 — series | D (100%) | 1 distinct |
| 8 — engine | X (100%) | 1 distinct |
A character that dominates the column usually marks the body style the model was mostly sold in; a spread across several means multiple bodies or engines shared the same platform.
What a decoded Peterbilt 379 VIN gets you
Reading the characters is the easy part — the reason to decode a VIN is what sits behind it. For the Peterbilt 379 that is 36 owner complaints and every recall campaign NHTSA has on record, keyed to the same VIN you just read:
| Data | For this model | Source |
|---|---|---|
| Recall campaigns | 80 campaigns | NHTSA |
| Owner complaints | 36 filed | NHTSA |
| Model years covered | 34 years | ForCar catalog |
Where to find the VIN on a Peterbilt 379
A Peterbilt 379 VIN normally opens with 1XP. Four places on the car carry the full number, and all four must agree — on a Peterbilt 379, a plate that disagrees is where fraud shows itself first.
| Where | How to see it | Why it matters |
|---|---|---|
| Dashboard, driver side | Through the windshield, bottom corner | Easiest to check before you touch anything |
| Driver door jamb | Open the door, sticker on the pillar | Also lists tyre pressures and build date |
| Under the hood | Firewall or strut tower plate | Survives a windshield replacement |
| Title and insurance | Paper documents | Must match the car — a mismatch means fraud or a swapped panel |
You know what it is. Find out what it's worth.
- Exact value for this VIN, adjusted for mileage
- The original window sticker and factory options
- Full research report as a PDF you can hand to a mechanic
- Decode a whole list of VINs at once
- No ads, no tracking — and much more
Frequently asked questions
Is this Peterbilt 379 VIN decoder free?
Yes — decoding a Peterbilt 379 VIN costs nothing and needs no account. Beyond the year, plant and build characters you also get what NHTSA holds on the Peterbilt 379 — 80 recall campaigns and 36 owner complaints — at no charge.
Why does my 379 VIN start differently from another 379?
Because the prefix changed during the model's run. Across the Peterbilt 379 VINs on record we see 2 of them: 1XP (1995–2007), 1NP (2000–2007). A 1995 car opens with 1XP, a 2007 one with 1NP, and both are genuine. A decoder that assumes a single prefix for the whole model is where the wrong answers come from.
How many characters is a Peterbilt 379 VIN?
Seventeen, on every Peterbilt 379 built from 1981 onwards, when the 17-character format became mandatory in the US. The oldest Peterbilt 379 VIN on file here is a 1996, so everything in our Peterbilt data already uses the modern layout.
Why do two Peterbilt 379 model years share the same VIN character?
Position 10 cycles through the alphabet every 30 years, skipping I, O, Q, U and Z. For the Peterbilt 379 that is not theoretical: a 1993 and a 2023 both carry P in position 10, and this model was built in both years. The check digit and serial range separate them.
Can a Peterbilt 379 VIN tell me if the car was in an accident?
Not from the characters themselves — they describe how the Peterbilt 379 left the factory, not what happened to it afterwards. Crash and title records sit in separate databases keyed to the same number. What is public are the 36 complaints Peterbilt 379 owners filed with NHTSA, and those we do show. Run the number through our VIN check to see what is on the record for it.
Do the body and engine characters mean the same thing on every Peterbilt?
No, and that is the usual mistake — positions 4–8 are assigned per model, not per brand. A letter that means one body on the Peterbilt 379 can mean a different one on another Peterbilt, and something else again on another marque. On Peterbilt 379 VINs the character that dominates position 4 is 5 — read it against the table above, not against a generic chart.
What if the VIN on the dashboard doesn't match the door jamb?
Treat it as a red flag on any car, and on a Peterbilt 379 check the prefix first: for the model year in question it should open with 1XP or 1NP, depending on when the car was built — anything outside that set did not come off a Peterbilt 379. Beyond that, mismatched plates mean either a replaced panel or a tampered identity — ask for documents and verify before any money changes hands.