Transmission by VIN: What a Decode Shows
A VIN decode returns transmission style and speed count for only some vehicles. See what NHTSA's free vPIC database carries, and where to find the rest.
NHTSA vPIC carries this field, but it can be blank. A provider with additional manufacturer or commercial data may return more information.
NHTSA vPIC may return TransmissionStyle and TransmissionSpeeds, depending on the manufacturer data available for the VIN. These fields describe a category and gear count, not an exact assembly part number or the condition of the installed transmission. If they are blank, use a manufacturer build record, option-code label or component identification. Other providers may have additional data.
Enter your VIN. See the available specs.
Decode the vehicle identity and available factory fields free. Some fields may be missing; the guidance below explains how to verify them.
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No subscription. No charge to check the VIN. Report contents vary by vehicle; applicable tax is shown at checkout.
See what the paid report includes →Two actual vPIC responses, checked September 6, 2026
We queried the same free NHTSA endpoint for these two public example VINs. Both returned decode error code 0, yet one omitted both transmission fields. This small demonstration is not a coverage estimate for all vehicles.
| Example vehicle | TransmissionStyle | TransmissionSpeeds | Check the source |
|---|---|---|---|
| 2013 Toyota Sienna | Not returned | Not returned | NHTSA response |
| 2003 Honda Accord | Automatic | 5 | NHTSA response |
The Accord’s category and gear count are not a transmission assembly part number. The Sienna’s blank fields do not prove that its transmission was replaced or that a different data source has no information. Live responses may change as manufacturer data is updated.
What did the transmission lookup return?
Move to a build record or component ID.
A blank means this source did not return that field. A manufacturer build record or a provider with different data may add information. Match the transmission’s identification tag before ordering parts.
Find the factory record →How do I find the transmission from a VIN?
- Decode the VIN free at free-vin-lookup.com/check or NHTSA's own decoder at vpic.nhtsa.dot.gov/decoder, then read the TransmissionStyle and TransmissionSpeeds fields.
- If both fields are empty, record that this source returned no transmission detail. Another provider may use additional manufacturer or commercial data; ask which source it uses instead of assuming every decoder has identical coverage.
- Use the returned engine, model year and drivetrain as context, then confirm the exact transmission against factory records and the installed unit. Those attributes alone are not a parts-fitment guarantee.
- Find the option-code label on the vehicle. GM puts a Service Parts Identification label in the glovebox or trunk listing RPO codes, where transmission codes generally begin with M; many Ford certification labels on the driver's door jamb carry a two-character TR code.
- Read the transmission itself. Most units carry a stamped code, casting number, or a manufacturer tag or sticker on the case or pan — this is how ZF, Aisin and GM units are told apart when the VIN cannot.
- Ask the manufacturer’s parts department for the original transmission assembly and applicable production-date details using the VIN. Compare those records with the installed component, especially when replacement or modification is possible.
Every TransmissionStyle value vPIC can return, from NHTSA's own lookup list (GetVehicleVariableValuesList/transmission style, 12 values). The five motorcycle entries describe final drive rather than the gearbox.
| vPIC ID | TransmissionStyle value | What it means |
|---|---|---|
| 2 | Automatic | Conventional planetary-gear automatic with a torque converter. Also what vPIC returns for electric vehicles with a single-speed reduction gear, paired with TransmissionSpeeds of 1. |
| 3 | Manual/Standard | Driver-shifted gearbox with a clutch pedal. TransmissionSpeeds gives the forward gear count. |
| 4 | Electronic Continuously Variable (e-CVT) | Power-split hybrid transaxle using a planetary gearset and two motor-generators. No belt and no fixed ratios, so TransmissionSpeeds is normally blank. |
| 7 | Continuously Variable Transmission (CVT) | Commonly a belt or chain running on variable-diameter pulleys, with no fixed gears. A generic CVT label alone does not establish the unit’s internal design; confirm the manufacturer’s specification. |
| 8 | Automated Manual Transmission (AMT) | A manual gearbox with computer-actuated clutch and shifting, using a single clutch. No clutch pedal. |
| 14 | Dual-Clutch Transmission (DCT) | Two clutches serving odd and even gearsets, allowing shifts without interrupting torque. |
| 15 | Direct Drive | Motor coupled to the driveline with no multi-speed gearbox. Present in the vocabulary but rarely applied to production EVs. |
| 9 | Motorcycle - Shaft Drive | On-road motorcycle using an enclosed driveshaft as final drive. |
| 10 | Motorcycle - Chain Drive | On-road motorcycle using a chain as final drive. |
| 11 | Motorcycle - Shaft Drive Off-Road | Off-road motorcycle or ATV with shaft final drive. |
| 12 | Motorcycle - CVT Belt Drive | Scooter or motorcycle with a continuously variable belt transmission. |
| 13 | Motorcycle - Chain Drive Off-Road | Off-road motorcycle with chain final drive. |
Where the VIN route stops for transmission
- Coverage varies by VIN. The two reproducible examples on this page were checked September 6, 2026: the Accord returned Automatic and 5, while the Sienna returned neither field. Two examples cannot establish a population-wide coverage rate.
- vPIC carries no transmission model designation at all. Its variable list (GetVehicleVariableList) contains exactly two entries under the Mechanical/Transmission group — ID 37, Transmission Style, and ID 63, Transmission Speeds. Nothing in the dataset can return 4L60E, 6T70, ZF 6HP26, A750E, or a GM RPO code.
- The federal VIN requirements do not guarantee a populated transmission field or exact assembly identifier in a public decoder. Read the returned source fields rather than inferring an exact unit from a valid VIN.
- A decoded configuration is not proof of the component currently fitted to the car. Factory records may add build-specific information, but later replacements still require inspection or service documentation.
- Electric vehicle coverage is inconsistent and loosely labeled. A 2023 Tesla Model 3 and a 2020 Chevrolet Bolt EV return 'Automatic' with 1 speed, describing a single-speed reduction gear; a 2019 Nissan Leaf, 2017 Tesla Model S and 2013 Chevrolet Volt return blank — even though vPIC's own vocabulary contains a 'Direct Drive' value it does not apply to them.
Where to get it instead
- The manufacturer's option-code label on the vehicle. This is the fastest reliable route when vPIC returns blank. GM's Service Parts Identification label, usually inside the glovebox or on the trunk lid, lists every RPO option code the vehicle was built with, and transmission RPOs generally start with M. Many Ford certification labels on the driver's door jamb carry a two-character TR code. These labels name the actual unit installed, which the VIN does not encode. Read the guide →
- The identification tag or stamp on the transmission case. Nearly every transmission carries its own identity independent of the VIN: a stamped code or casting number on the housing, or a manufacturer tag or barcode sticker on the case or pan. This is the only way to separate variants that share a gear count — the ZF 6HP19, 6HP21, 6HP26 and 6HP28 are all six-speed automatics and all decode identically when they decode at all.
- A franchised dealer's parts department, using your VIN. OEM parts catalogs are keyed to the factory build record rather than the VIN pattern, so they resolve a VIN to the exact transmission assembly, part number included. Parts departments do this lookup routinely and usually at no charge. This is the authoritative answer when you are buying a replacement unit and a wrong guess is expensive.
- vPIC's engine and weight fields, to narrow the possibilities. Returned engine, drivetrain and weight-class attributes help a parts specialist narrow the configuration. They cannot establish compatibility by themselves; verify the assembly code and production details before ordering. Source →
Primary sources
Open the underlying public source and verify that its scope matches the question you are asking.
- vPIC Vehicle Variable Values List: Transmission StyleNHTSA
- vPIC API, DecodeVinValues endpoint and variable listNHTSA
- 49 CFR 565.15, VIN content requirements (Table I, attributes decipherable from positions 4-8)eCFR, National Archives
- 49 CFR Part 567, Certification label requirementseCFR, National Archives
- NHTSA VIN DecoderNHTSA
Transmission by VIN: What a Decode Shows — questions
How can I identify what type of transmission my vehicle has?
Start with a VIN decode and read any returned transmission type and speed count. If the detail is missing or too broad, check factory records and the component’s identification label with a qualified technician. Coverage differs by vehicle and data source.
Where can I find reliable resources or tools to help identify my car's transmission?
Use NHTSA for the available decoded fields, then a manufacturer’s parts department or build record for original equipment. Check the installed transmission’s tag and repair records as well: a factory record cannot rule out a later swap.
How can I identify the specific GM transmission code in my vehicle?
Look for the Service Parts Identification label, usually inside the glovebox or on the trunk lid. It lists the RPO option codes the vehicle was built with, and GM transmission RPOs generally begin with the letter M. Cross-reference that three-character code against GM's RPO list. A VIN decode will not give you the RPO, because vPIC carries no field for it.
How do I identify the correct transmission model for my 2002 Silverado?
A VIN decode will not tell you directly. In our testing, GM trucks of that era returned blank TransmissionStyle from vPIC. Instead, find the M-prefixed RPO code on the glovebox SPID label, which names the exact unit. The eighth VIN character gives the engine, and engine plus GVWR narrows the choice considerably, since heavier-duty trucks got the stronger transmission.
How do I identify the correct ZF 6HP transmission model for my vehicle?
A VIN decode cannot separate the 6HP variants. vPIC returns at most Automatic with six speeds, which is true of 6HP19, 6HP21, 6HP26 and 6HP28 alike; they differ by input-torque rating, not gear count. The variant is printed on the ZF part-number tag or sticker on the transmission case or pan. A dealer parts lookup by VIN also resolves it.
How do I know if my vehicle needs a 6T30 or 6T50 transmission?
Not from the VIN alone. Both are GM six-speed transaxles that vPIC reports identically, as Automatic with six speeds, when it reports anything at all. They differ in torque capacity and are matched to engine size. Check the RPO code on the SPID label, or the identification tag on the transaxle, and confirm with a parts department before ordering.
Can I check the VIN of my car at AutoZone and find details like engine type or year?
Yes for year, make, model and engine; not reliably for transmission. Parts-store lookups run against a commercial catalog and usually ask you to confirm your transmission rather than reporting it, because the catalog cannot resolve it from the VIN either. NHTSA's free decoder returns engine displacement and cylinder count on about nine VINs in ten, which is the same information.
How do I identify the correct transmission model for my Dodge Ram 1500?
Check the vehicle, not the VIN. In testing, a 2016 Ram 1500 returned blank transmission fields from vPIC. The transmission carries its own identification tag or stamped code on the case. Ram build sheets and the dealer parts catalog both resolve a VIN to the exact unit. Engine and model year, which vPIC does return, narrow it down first.