Peterbilt Parts Lookup by VIN — Decode the PACCAR Spec That Gets You the Right Part.
Ordering Peterbilt parts without the decoded VIN spec is how fleets end up with wrong-fitment returns. Every Peterbilt built since MY1981 carries a 17-character VIN encoding its model series (579, 389, 567), engine family (PACCAR MX or Cummins X15), GVWR class, and cab configuration — the spec PACCAR Parts uses to identify the right part number. Decode the VIN below, then take the output to your PACCAR Parts dealer. Free, instant.
Free Peterbilt VIN Lookup — Decode Any Peterbilt VIN for Parts
Enter the 17-character Peterbilt VIN and surface the model series, engine family, GVWR class, transmission type, cab config, and plant — the spec PACCAR Parts needs.
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Quick Answer
- How do I look up Peterbilt parts by VIN?
- Decode the 17-character Peterbilt VIN with CarCheckerVIN to identify the exact build spec — model series, engine family (PACCAR MX-13/MX-11 or Cummins X15), transmission type, GVWR class, and axle configuration. Bring that decoded spec to a PACCAR Parts dealer or authorized Peterbilt service center to match OEM part numbers. The VIN decodes the spec; the spec unlocks the parts catalog. CarCheckerVIN does not return part numbers.
- What does a Peterbilt VIN tell a parts buyer?
- A Peterbilt VIN (WMI 1XP or 1NP) encodes the model series (579, 389, 567, 537), engine family, GVWR class, cab configuration, model year (position 10), and Denton Texas assembly plant (position 11). Because the engine — PACCAR MX or a Cummins — is a separate unit recorded on the PACCAR spec sheet, parts buyers need both the decoded VIN and the spec sheet to confirm fitment on drivetrain and emissions components.
- Where do I get official Peterbilt OEM part numbers?
- PACCAR Parts, Peterbilt's official parts network, is the source for genuine OEM part numbers. Supply the decoded VIN spec — engine family, model year, and axle configuration — to a PACCAR Parts dealer or authorized Peterbilt service center. CarCheckerVIN provides the decoded spec and open recall status; the PACCAR Parts counter provides the actual OEM part numbers.
What a Peterbilt VIN Tells a Parts Buyer
The 17 characters of a Peterbilt VIN encode the build attributes that drive parts fitment — but not every field a technician needs is in the string. Here is what a Peterbilt parts lookup by VIN returns, and where the PACCAR spec sheet must fill the gaps.
Engine family — PACCAR MX or Cummins
The VIN descriptor section identifies the engine family: PACCAR MX-13 (most common on 579 and 389 linehaul), PACCAR MX-11 (lighter-spec line-haul), or Cummins X15 (specified by certain fleets). The full engine serial, horsepower rating, and emissions calibration live on the engine dataplate and PACCAR spec sheet. Both the VIN-decoded engine family and the engine serial are required to order injectors, EGR valves, turbocharger components, or aftertreatment parts — the parts counter cannot confirm fitment from the VIN string alone.
GVWR class and axle configuration
The descriptor section encodes the GVWR band that separates Class 7 medium-duty 537 units from Class 8 on-highway 579 and 389 tractors. Axle configuration — 6x4 tandem-drive, 4x2 single-drive, 6x2 liftable rear, or heavy-haul 567 setups — determines which axle seals, bearings, and lube specifications are correct. A mismatch on axle config means a part that physically resembles the right component will fail in service.
Transmission type
Peterbilt encodes the transmission family in the descriptor section: Eaton Fuller manual (13-speed or 18-speed), Eaton UltraShift Plus AMT, or PACCAR TX-12 or TX-18 automated. Each transmission has its own filter, fluid spec, and shift-system components. Ordering a DT12 filter for a TX-18 truck is a fitment failure that starts with a missed VIN decode.
Model series and cab configuration
579 aero-on-highway sleeper or day cab, 589 new classic (the 389's successor), 389 or 379 long-hood, 567 vocational and heavy-haul, 520 refuse cabover, 548 or 537 medium-duty — the VIN descriptor encodes the model and cab type. Cab model determines door glass, mirror assemblies, dash panels, HVAC components, and interior trim part numbers. The wrong model series and the part will not fit.
Assembly plant and model year
Peterbilt builds its Class 8 trucks in Denton, Texas. Position 11 of the VIN encodes the plant; position 10 encodes the model year (1=2001 through 9=2009, A=2010 onward). Model year is critical for emissions tier: pre-EPA07, EPA07–09, EPA10+, and GHG17 trucks carry different DPF and SCR configurations with non-interchangeable aftertreatment components.
Open recalls — know before you order
A Peterbilt VIN lookup pulls the live NHTSA recall feed. Open recall campaigns on brake systems, fuel lines, or steering components mean the corresponding parts are supplied by the dealer at no charge under the recall. Running the VIN before ordering prevents spending on components covered by an active campaign.
Decoding a Peterbilt VIN for Parts Ordering
Peterbilt is a PACCAR Inc. brand — the same parent company as Kenworth. Its Class 8 trucks use the WMI codes 1XP and 1NP for US production. The 17-character VIN follows the ISO 3779 global standard; here is what each position section means for a parts lookup.
The first three characters are the World Manufacturer Identifier (WMI). US-built Peterbilt trucks carry 1XP — this covers the 579, 389, 567, and 537 lines built in Denton, Texas. 1NP is also assigned to Peterbilt. Legacy Canadian-built units from Ste-Thérèse, Quebec appear on older trucks with different WMI prefixes. Confirming the WMI matches the claimed origin is the first fraud check for a used Peterbilt.
Characters four through eight are the vehicle descriptor — encoding model series, engine family, GVWR class, and cab configuration. Character nine is the check digit (math-derived; VINs exclude the letters I, O, and Q). Character ten is the model year code — critical for emissions tier. Character eleven is the plant code (Denton TX on current production). Characters twelve through seventeen are the unique production serial and set the truck apart from every other Peterbilt with the same descriptor.
For parts ordering, present the decoded fields — not the raw 17-character string — to the PACCAR Parts counter: model series, engine family, model year, GVWR class, and axle configuration. The parts specialist cross-references those fields in the PACCAR catalog alongside the engine serial from the dataplate to return the correct part number. The decoded VIN is the starting point; the build spec and engine dataplate complete the picture.
Peterbilt VIN identifiers
1XPUS-built Peterbilt (primary WMI, Denton TX)1NPUS-built Peterbilt (secondary WMI)Pos 10Model year — determines emissions tierPos 11Assembly plant (Denton TX on modern builds)Pos 8Engine family + GVWR class encoded herePos 12–17Unique production serial
PACCAR MX-13 and MX-11 engines are built by PACCAR separately from the chassis. The engine serial on the dataplate — not the VIN — is required by PACCAR Parts to confirm injection or turbocharger fitment.
Where to Find the VIN on a Peterbilt for a Parts Lookup
Federal FMVSS regulations require the VIN in at least two locations on every commercial vehicle. On a Peterbilt, the primary VIN is on the driver-door jamb FMVSS label — the placard that also lists GVWR, front and rear GAWR, and tire specs. That label is the most reliable source for a parts lookup because it is factory-installed and includes the build date.
The secondary VIN location on a Peterbilt is the cab dashboard plate, visible through the windshield from outside the truck on the lower driver-side corner — the same format as a passenger-car dashboard VIN. A third VIN is typically frame-stamped on the left-side rail near the front axle, readable even if the cab is damaged or replaced. The title document, commercial registration, and insurance certificate all list the VIN as well.
For a parts lookup, always copy the VIN exactly from the door-jamb label. On a Peterbilt with high mileage or repaired cab damage, verify the door-jamb VIN against the frame-rail stamp — a mismatch between the two is a strong indicator that the cab has been swapped and the truck's history may not match its parts configuration. A single transposed digit changes the decoded model year or engine family and sends the wrong part.
Peterbilt VIN locations
- Driver-door jamb FMVSS label (primary — includes build date)
- Dashboard plate, lower driver-side, visible through windshield
- Left frame rail stamp near front axle
- Title and commercial registration documents
- Commercial insurance certificate
Always compare the door-jamb VIN against the frame-rail stamp on high-mileage or repaired Peterbilts. A cab swap can create a VIN mismatch that affects parts fitment history.
Decode Your Peterbilt VIN for Free
Get the PACCAR MX engine family, emissions tier, model series, and axle config your parts counter needs — free, instant, no account required.
How Open Peterbilt Recalls Affect Parts Orders
An open NHTSA recall on a Peterbilt VIN can mean that specific components are covered at no charge by the manufacturer. Knowing recall status before ordering parts prevents paying out of pocket for components a campaign would supply free. Three recall categories are most commonly encountered on used Peterbilt Class 8 trucks.
Brake system and air line campaigns
NHTSA has issued Peterbilt recall campaigns covering air-brake valves, automatic slack adjusters, and brake chamber components. If the VIN carries an open brake recall, the replacement parts are supplied and installed by an authorized Peterbilt service center at no charge. Ordering those components yourself through PACCAR Parts before checking recall status means paying for work the recall covers.
Fuel system and aftertreatment components
Fuel filter mounting, injector return line, and DEF system campaigns have appeared on EPA10 and GHG17 Peterbilts. An open fuel system or aftertreatment recall means specific components — DEF dosing modules, fuel lines, or aftertreatment sensors — are covered under the campaign. The VIN lookup tells you which campaigns are open before you place the parts order.
Electrical and wiring harness recalls
Certain Peterbilt 579 and 389 model years carry electrical harness and lighting recall campaigns that affect body control modules and exterior lighting wiring. Wiring harness recall completions are logged by VIN — a VIN lookup shows whether a prior fleet owner resolved the campaign, which matters when you are diagnosing an electrical fault and ordering replacement wiring components.
Buying a used Peterbilt or ordering parts for a fleet truck? Run a recall check and a truck history report before spending on components that an open campaign would cover at no charge from your PACCAR dealer.
VIN vs. PACCAR Spec Sheet — What Each One Covers
The 17-character VIN is a build identifier, not a full spec record. It encodes roughly 10–15 build attributes: model series, engine family, GVWR class, cab configuration, model year, and assembly plant. The PACCAR spec sheet (sometimes called the factory data card) records every factory-ordered option: engine horsepower rating, transmission configuration, axle ratio, PTO provisions, suspension air-bag specification, and aftertreatment calibration. Parts buyers who need component-level fitment on PACCAR MX injection systems, DT12 transmission internals, or tandem-axle hardware need the spec sheet — the VIN is the key that retrieves it.
For trucks other than Peterbilt, see our semi-truck VIN lookup guide covering all Class 8 builders. For Peterbilt specifically, request the PACCAR factory data card from any PACCAR Parts dealer by supplying the VIN — they can pull the build record and cross-reference it with the truck history report to confirm the truck's spec matches its paperwork before major parts investment.
The workflow: decode the VIN first to confirm model series, engine family, and model year (fast, free). Then bring the decoded spec to the PACCAR Parts counter and request the factory data card by VIN. The two together — decoded VIN plus factory build record — eliminate wrong-fitment orders on expensive Peterbilt drivetrain components.
Peterbilt parts-ordering checklist
- Decode the VIN to confirm model series (579, 389, 567, 537)
- Identify engine family (PACCAR MX-13 / MX-11 vs. Cummins X15)
- Note model year (position 10) to confirm emissions tier and aftertreatment spec
- Confirm transmission type (Eaton Fuller, UltraShift, PACCAR TX-12/TX-18)
- Verify axle configuration (6x4, 4x2, 6x2) for chassis hardware
- Check open recalls — brake, fuel, and electrical components may be covered free
- Supply decoded spec + engine serial to PACCAR Parts for exact part numbers
Start with the free VIN decode — paste the Peterbilt VIN here:
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Peterbilt Parts Lookup by VIN — Frequently Asked Questions
The questions fleet managers, owner-operators, and used-Peterbilt buyers ask most when ordering parts by VIN.
How do I look up Peterbilt parts by VIN?+
To look up Peterbilt parts by VIN, decode the 17-character VIN using CarCheckerVIN to surface the model series (579, 389, 567, 537), engine family (PACCAR MX-13, MX-11, or Cummins X15), GVWR class, cab configuration, model year, and assembly plant. Take the decoded spec to a PACCAR Parts dealer or authorized Peterbilt service center and request the OEM part number using the spec plus the engine serial from the engine dataplate. CarCheckerVIN decodes the VIN and checks open NHTSA recalls; the PACCAR Parts counter cross-references the spec in the factory catalog to return the correct part numbers.
What does the Peterbilt VIN tell me about the engine?+
The Peterbilt VIN descriptor section (positions 4–8) encodes the engine family — PACCAR MX-13, PACCAR MX-11, or Cummins X15 — and the GVWR class. However, the full engine serial, horsepower rating, and emissions calibration live on the engine dataplate and the PACCAR spec sheet. For parts ordering on injection, turbocharger, or aftertreatment components, you need both the VIN-decoded engine family and the engine serial from the dataplate. Present both to the PACCAR Parts counter for guaranteed fitment.
What WMI does Peterbilt use?+
US-built Peterbilt trucks carry the World Manufacturer Identifier 1XP — this covers the 579, 389, 567, and 537 lines assembled in Denton, Texas. 1NP is also assigned to Peterbilt. Legacy trucks from the Ste-Thérèse, Quebec plant appear with different WMI codes on older units. If a truck claimed to be a Peterbilt carries a WMI that does not match these codes, that discrepancy is worth investigating before purchase or before a major parts investment.
Where is the VIN on a Peterbilt 579?+
On a Peterbilt 579, the primary VIN location is the driver-door jamb FMVSS label — a white placard that also lists the GVWR, front GAWR, rear GAWR, and tire inflation specs. The dashboard VIN plate is visible through the lower driver-side corner of the windshield from outside. A third VIN is frame-stamped on the left-side rail near the front axle. The title, commercial registration, and insurance certificate all carry the VIN. For parts lookups, always use the full 17-character string from the door-jamb label.
Can I get Peterbilt part numbers from the VIN alone?+
No — the VIN alone does not return OEM part numbers. The VIN decodes to the build spec (model series, engine family, model year, axle configuration, cab type), which a PACCAR Parts dealer then cross-references in the OEM catalog — along with the engine serial from the engine dataplate — to return the correct part numbers. CarCheckerVIN provides the decoded build spec and checks open NHTSA recalls; the PACCAR Parts counter uses that spec to identify the exact part number for your truck's configuration.
What is PACCAR Parts and where do I find them?+
PACCAR Parts is the official parts distribution network for both Peterbilt and Kenworth, owned by PACCAR Inc. It distributes genuine OEM parts through a network of dealers and PDCs (Parts Distribution Centers) across North America. For a Peterbilt parts lookup by VIN, supply the decoded spec — chassis model, engine family, model year, and axle configuration — to the nearest PACCAR Parts dealer or authorized Peterbilt service center. They can also pull the PACCAR factory data card by VIN, which contains the full build record.
Does a Peterbilt VIN lookup show title history?+
Yes. A Peterbilt VIN lookup through CarCheckerVIN checks the VIN against NMVTIS-sourced title brand records (flood, salvage, junk, rebuilt, lemon-law buyback), open NHTSA recall campaigns, and available odometer or ECM-hour snapshots from title transfers. This is valuable for used Peterbilt buyers and fleet managers who want to know whether a truck was rebuilt after a major loss, whether prior fleets completed open recalls, and whether the mileage is consistent with the title history. The free lookup covers key flags; a full truck history report surfaces every dated line item.
Decode Your Peterbilt VIN and Order With Confidence
Enter any 17-character Peterbilt VIN to get the model series, PACCAR MX engine family, emissions tier, and axle configuration your PACCAR Parts counter needs — free, no account required.
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