Most Kenworth W900 VINs open with 1XK (the United States, 1994–2005) or 1NK (the United States, 1999–2000). Position 11, the plant, shows 7 codes, most often R (41%); a 2005 W900 carries 5 in position 10. Decoding one also brings up 39 recall campaigns and 17 owner complaints from NHTSA.
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How to read a Kenworth W900 VIN
Here is a real 2005 Kenworth W900 VIN from our database, split into its parts:
VIN 1XKWDB9XX5J087437 — 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. |
Kenworth W900 VIN prefixes, and when each one was used
The Kenworth W900 VINs on record carry 2 different prefixes. The main one is 1XK (the United States, 1994–2005), then 1NK (the United States, 1999–2000):
| VIN starts with | Years seen | Built in | Vehicle type | VINs on record |
|---|---|---|---|---|
| 1XK | 1994–2005 | United States | Truck | |
| 1NK | 1999–2000 | United States | Incomplete Vehicle |
Position 11 names the plant. On the Kenworth W900 it is not one number either — assembly moved between 7 of them over the years:
| Plant code | Years active | VINs on record | Share |
|---|---|---|---|
| R | 1998–2005 | 7 | |
| J | 1995–2005 | 5 | |
| S | 1994–1994 | 1 | |
| 1 | 1997–1997 | 1 | |
| A | 1999–1999 | 1 | |
| G | 2002–2002 | 1 | |
| L | 2004–2004 | 1 |
Counted from 13 dated Kenworth W900 VINs attached to NHTSA complaints, each code checked against the NHTSA manufacturer registry.
Model-year codes for the Kenworth W900
Position 10 carries the model year, skipping I, O, Q, U and Z. The alphabet comes round every 30 years, which the Kenworth W900 has not yet outlived: its 25 years still map one-to-one. All 25 model years of the Kenworth W900, 1981 to 2005, with the character each one carries:
| Model year | VIN character (position 10) | Same character as |
|---|---|---|
| 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 | — |
| 1992 | N | — |
| 1991 | M | — |
| 1990 | L | — |
| 1989 | K | — |
| 1988 | J | — |
| 1987 | H | — |
| 1986 | G | — |
| 1985 | F | — |
| 1984 | E | — |
| 1983 | D | — |
| 1982 | C | — |
| 1981 | B | — |
Body and engine characters we see on Kenworth W900 VINs
Positions 4–8 are the maker's own build code. Across 6 VINs the Kenworth W900 uses 4 different characters in positions 4, 5 and 8:
| Position | Characters seen on real VINs | Variety |
|---|---|---|
| 4 — body | W (100%) | 1 distinct |
| 5 — series | D (83%) · L (17%) | 2 distinct |
| 8 — engine | X (100%) | 1 distinct |
What a decoded Kenworth W900 VIN gets you
Behind a Kenworth W900 VIN: 17 owner complaints and every recall campaign NHTSA has on record:
| Data | For this model | Source |
|---|---|---|
| Recall campaigns | 39 campaigns | NHTSA |
| Owner complaints | 17 filed | NHTSA |
| Model years covered | 25 years | ForCar catalog |
Where to find the VIN on a Kenworth W900
A Kenworth W900 VIN normally opens with 1XK; the full number sits in four places, and all four must match.
| 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 tire 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 |
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Frequently asked questions
Is this Kenworth W900 VIN decoder free?
Yes, with no account. Besides the year, plant and build characters it shows 39 recall campaigns and 17 owner complaints NHTSA holds on the Kenworth W900.
Why does my W900 VIN start differently from another W900?
Because the Kenworth W900 was built under several maker codes, by plant and period. Across the Kenworth W900 VINs on record we see 2 of them: 1XK (1994–2005), 1NK (1999–2000). Each is genuine for its years.
What year is my W900 by its VIN?
Read position 10: a 2005 W900 carries 5, a 2004 W900 carries 4, a 2003 W900 carries 3.
Where was my W900 built?
Position 11 names the plant. Across 17 dated Kenworth W900 VINs it reads R 41%, J 29%, S 6%, 1 6% and 3 rarer codes.
What does position 4 mean on a Kenworth W900 VIN?
It is part of the maker's own build code, so read it against this model, not a generic chart. On 6 Kenworth W900 VINs here, W is the most common character in position 4, on 100% of them.
What if the VIN on the dashboard doesn't match the door jamb?
On a Kenworth W900 check the prefix first: most genuine ones open with 1XK or 1NK. A plate that starts with anything else, or disagrees with the other copies of the number, needs documents checked before any money changes hands.
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