← All owner tools · Decode your own SPID label with the GM RPO decoder
| Code | Meaning | Years | Sourcing |
|---|---|---|---|
| 001 | P RAT, M RATIO, 3.70 | 1991 | GM sourced |
| 001 | Rat, M Ratio, 3.70 | 1991 | GM dated |
| 002 | P RAT, M RATIO, 4.11 (4 1/9) | 1991 | GM sourced |
| 002 | Rat, M Ratio, 4.11 (4 1/9) | 1991 | GM dated |
| 003 | Rat, M Ratio, 4.33 | 1991 | GM dated |
| 003 | P RAT, M RATIO, 4.33 | 1991 | GM sourced |
| 004 | Rat, M Ratio, 4.78 | 1994 | GM dated |
| 004 | P RAT, M RATIO, 4.78 | 1994 | GM sourced |
| 005 | Rat, M Ratio, 4.56 (4 5/9) | 1991 | GM dated |
| 005 | P RAT, M RATIO, 4.56 (4 5/9) | 1991 | GM sourced |
| 006 | Rat, M Ratio, 4.63 (4 5/8) | 1996 | GM dated |
| 006 | P RAT, M RATIO, 4.63 (4 5/8) | 1996 | GM sourced |
| 007 | Rat, M Ratio, 3.07 | 1997 | GM dated |
| 007 | P RAT, M RATIO, 3.07 | 1997 | GM sourced |
| 008 | Rat, M Ratio, 4.88 | 1996 | GM dated |
| 008 | P RAT, M RATIO, 4.88 | 1996 | GM sourced |
| 009 | Rat, M Ratio, 5.29 | 1991 | GM dated |
| 009 | P RAT, M RATIO, 5.29 | 1991 | GM sourced |
| 00A | Spare wheel upgrade Chevrolet Silverado 1500 | 2022–2023 | GM sourced |
| 00A | Wheel Spare 17 X 8.0, J, Steel, Design 2 | — | Reference |
| 00D | Not Equipped with Climate Control Knob Digital Temperature Display Chevrolet Silverado 1500 | 2022 | Provisional |
| 00G | Not Equipped with Heated Steering Wheel, see dealer for details Chevrolet Silverado 1500 | 2022–2023 | Provisional |
| 00L | Ccl, R Secondary Color, Exterior, Prime | 1989 | GM dated |
| 00L | P CCL, R SECONDARY COLOR, EXTERIOR, PRIME | 1989 | GM sourced |
| 00L | Exterior Color,secondary,prime,union City Body | — | GM dated |
| 00R | Not Equipped with Heated Rear Outboard Seats, see dealer for details Chevrolet Silverado 1500 | 2022–2023 | Provisional |
| 00U | Ccu, M Primary Color, Exterior, Prime | 1989 | GM dated |
| 00U | P CCU, M PRIMARY COLOR, EXTERIOR, PRIME | 1989 | GM sourced |
| 00U | Exterior Color,primary,prime,upper,union City Body | — | GM dated |
| 00V | Not Equipped with Heated or Ventilated Front Seats, see dealer for details Chevrolet Silverado 1500 | 2022–2023 | Provisional |
| 00Y | Not Equipped with Rear Park Assist, see dealer for details Chevrolet Silverado 1500 | 2022–2023 | Provisional |
| 00Z | Not Equipped with Front and Rear Park Assist, see dealer for details Chevrolet Silverado 1500 | 2022–2023 | Provisional |
| 010 | Rat, M Ratio, 5.43 | 1991 | GM dated |
| 010 | P RAT, M RATIO, 5.43 | 1991 | GM sourced |
| 011 | Rat, M Ratio, 5.57 (5 4/7) | 1991 | GM dated |
| 011 | P RAT, M RATIO, 5.57 (5 4/7) | 1991 | GM sourced |
| 012 | Rat, M Ratio, 5.83 | 1991 | GM dated |
| 012 | P RAT, M RATIO, 5.83 | 1991 | GM sourced |
| 013 | Rat, M Ratio, 3.73 | 1995 | GM dated |
| 013 | P RAT, M RATIO, 3.73 | 1995 | GM sourced |
| 014 | Rat, M Ratio, 6.14 (6 1/7) | 1991 | GM dated |
| 014 | P RAT, M RATIO, 6.14 (6 1/7) | 1991 | GM sourced |
| 015 | Rat, M Ratio, 6.17 | 1991 | GM dated |
| 015 | P RAT, M RATIO, 6.17 | 1991 | GM sourced |
| 016 | Rat, M Ratio, 5.25 | 1991 | GM dated |
| 016 | P RAT, M RATIO, 5.25 | 1991 | GM sourced |
| 017 | Rat, M Ratio, 6.50 | 1991 | GM dated |
| 017 | P RAT, M RATIO, 6.50 | 1991 | GM sourced |
| 018 | Rat, M Ratio, 6.65 | 1989 | GM dated |
| 018 | P RAT, M RATIO, 6.65 | 1989 | GM sourced |
| 019 | Rat, M Ratio, 6.67 | 1989 | GM dated |
| 019 | P RAT, M RATIO, 6.67 | 1989 | GM sourced |
| 01A | Stc, R Stripe Color, Accent, Two Tone, Silver/gunmetal (1995) | 1998 | GM dated |
| 01A | P STC, R STRIPE COLOR, ACCENT, TWO TONE, SILVER/GUNMETAL (1995) | 1998 | GM sourced |
| 01A | Stripe Color Accent, Two Tone, Silver/gunmetal | — | GM dated |
| 01A | Trim Color Seat Jet Black | — | GM dated |
| 01B | Trim Color Seat LT Neutral | — | Reference |
| 01C | Trim Color Seat LT Titanium | — | Reference |
| 01D | Trim Color Seat LT Cashmere | — | Reference |
| 01E | Trim Color Seat DK Titanium | — | Reference |
The full list, A to Z
Showing 501–600 of 643 codes beginning with W. One meaning shown per code — the best-sourced one we hold. Search above for the rest.
| Code | Meaning | Years | Sourcing |
|---|---|---|---|
| WK3 | Delta Royale Brougham 'ls' | — | Reference |
| WK4 | Delta 88 Holiday S.c. Package | — | Reference |
| WK5 | Calais,special Edition | — | Reference |
| WK6 | External Egr Valve | — | Reference |
| WK9 | Regency Brougham Sedan | — | Reference |
| WKA | P, TIRES, CUSTOMER PROPERTY, PENSKE TRUCK | 1990 | GM sourced |
| WKB | P, HLG, R HANDLING CHARGE, GMTG TO NORTHLAND EQUIPMENT CO | 1998 | GM sourced |
| WKC | P, HLG, R HANDLING CHARGE, GMTG TO MORGAN CORPORATION this code has more than one documented meaning — filter by year | 1995 | GM sourced |
| WKD | P, TIRES, CUSTOMER PROPERTY, COCA-COLA | 1998 | GM sourced |
| WKE | P, TRIM OVERRIDE, LEATHER | 1995 | GM sourced |
| WKI | Sales Package Dot Racing Edition | — | Reference |
| WKP | Accessory Cover - Vehicle - Indoor, Design 5 | — | Reference |
| WKQ | Accessory Cover - Vehicle - Indoor, Design 4 | — | Reference |
| WL1 | Toronado 20th Anniversary Appearance Package | — | Reference |
| WL2 | Manifold,exhaust(cast Iron) | — | Reference |
| WL3 | Trofeo Sport Coupe Package(merchandising Option) | — | Reference |
| WL9 | P, MSM, R MODEL CONVERSION, POLICE VEHICLE, 20517 E 1 | — | GM sourced |
| WLA | Fascia Frt, Accent Color | — | Reference |
| WLB | Family Code, Wheelbase this code has more than one documented meaning — filter by year | 1988 | GM dated |
| WLE | Window control, all windows | 2026 | GM sourced |
| WLP | Ornamentation Lettering, 'platinum' | — | Reference |
| WM0 | Package - Turbo Engine | — | Reference |
| WM1 | P, PARTS PKG, CONVERTIBLE APPEARANCE PKG #1 | 1999 | GM sourced |
| WM2 | P, PARTS PKG, CONVERTIBLE APPEARANCE PKG #2 this code has more than one documented meaning — filter by year | 1999 | Provisional |
| WM3 | Appearance Package,convertible #3 | — | Reference |
| WM4 | P, PARTS PKG, CONVERTIBLE GT APPEARANCE PKG this code has more than one documented meaning — filter by year | 1999 | Provisional |
| WM8 | Appearance Package,quad-4 | — | Reference |
| WMF | VIN Model Year 2015 | — | Reference |
| WMI | Active Aero Shutters, upper and lower | 2026 | GM sourced |
| WMS | Ornamentation Lettering, 'cx' | — | Reference |
| WN2 | Package,exterior,sport 'esp'(4nj27 + Wn2 = 4nm27) | — | Reference |
| WN3 | Package,interior Sport 'isp'(merchandising Option) | — | Reference |
| WNF | P, PARTS PKG, LOW COST VARIANT, 20124 E 8 | — | Provisional |
| WP2 | Appearance Package Cavalier Rally Sport | — | Reference |
| WPA | Sales Package Driver Confidence, Pkg A | — | Reference |
| WPC | Sales Package Comfort And Convenience | — | Reference |
| WPE | Sales Package Entertainment | — | Reference |
| WPF | Sales Package Preferred | — | Reference |
| WPG | Sales Package Enhanced Convenience | — | Reference |
| WPK | RST Performance Edition this code has more than one documented meaning — filter by year | 2026 | GM sourced |
| WPL | Luxury Package | 2026 | GM sourced |
| WPQ | Protection Package | 2026 | GM sourced |
| WPR | Sales Package Advanced Safety 1 | — | Reference |
| WQN | Wheel 18 X 8.0, J, Aluminum, Design 14 | — | Reference |
| WQS | Wheel 16 X 6.5, Aluminum, Design 17 | — | Reference |
| WQT | Wheel 18 X 8, Aluminum, Design 22 | — | Reference |
| WQW | Wheel 16 X 6.5, Aluminum, Design 18 | — | Reference |
| WQX | Wheel 17 X 7, Aluminum, Design 19 | — | Reference |
| WQY | Wheel 17 X 7, Aluminum, Design 20 | — | Reference |
| WR0 | P, APP, R APPEARANCE PACKAGE, SPECIAL EDITION TRACKER | 1998 | Provisional |
| WR1 | Wheels, 20 inch Bright finish aluminum | 2026 | GM sourced |
| WR4 | Wheels, 20 inch Bright finish aluminum | 2026 | GM sourced |
| WR6 | Wheel 16 X 6.5, J, Aluminum, Design 8 | — | Reference |
| WRA | Wiring Provisions Custom Wiring Harness (body) | — | Reference |
| WRB | Wiring Provisions Custom Wiring Harness (i/p) | — | Reference |
| WRC | Wiring Provisions Custom Wiring Harness (hdlp) | — | Reference |
| WRG | Family Code, Wheel RR Generic | 1989 | GM dated |
| WRH | Wiring Provisions Cooling Fan Jumper | — | Reference |
| WRJ | Wiring Provisions Power Distribution Center - Dual | — | Reference |
| WRK | Wiring Provisions Power Distribution Center - Single | — | Reference |
| WRM | FAMILY CODE, WARRANTY MANUAL, 20430 | — | Provisional |
| WRN | P, PLT, R PLANT CODE, WILLOW RUN, MI, USA | 1997 | GM sourced |
| WRS | Merchandised Pkg Rally Sport (rs) | — | Reference |
| WS1 | P, SALES, PROGRAM-#1 | 1987 | Provisional |
| WS2 | Sales Special Edition | — | Reference |
| WS3 | P, SALES, PROGRAM-#3 | 1987 | Provisional |
| WS4 | Trans AM Option this code has more than one documented meaning — filter by year | — | Reference |
| WS5 | P, SALES, PROGRAM-#5 | 1987 | Provisional |
| WS6 | P, SALES PACKAGE, APPEARANCE & PERFORMANCE | 1999 | GM sourced |
| WS7 | P, OWM, R OWNERS MANUAL, INFORMATION | 1993 | Provisional |
| WS8 | P, VEHICLE, ACKNOWLEDGEMENT, PRICE ORDER | 1998 | Provisional |
| WS9 | P, MSM, R MODEL CONVERSION, PONTIAC FIREBIRD FORMULA | 1998 | GM sourced |
| WSD | Appearance Package Cadillac Escalade Awd, 'collector's Edition' | — | Reference |
| WT1 | Appearance Package,ext # 1 | — | Reference |
| WT2 | P, APP, R APPEARANCE PACKAGE, EXTERIOR #2 | 1993 | Provisional |
| WT3 | P, APP, R APPEARANCE PACKAGE, EXTERIOR #3 | 1998 | Provisional |
| WT4 | P, HLG, R HANDLING CHARGE, GM ST THERESE TO SVE MONT ROYAL QUEBEC FOR, UPFITTER CONVERSION (VTIMS) | 1998 | Provisional |
| WT5 | P, HLG, R HANDLING CHARGE, DORAVILLE TO COMM TRUCK & VAN EQUIP BACK TO, DORAVILLE | 1997 | Provisional |
| WT6 | P, SSS, M SENSOR, THEFT DETERENT - DELETE | 1998 | Provisional |
| WT7 | P, HLG, R HANDLING CHARGE, DORAVILLE TO CROWN STEEL (DIV OF TRANSPRO) BACK TOBALTIMORE | 1998 | Provisional |
| WT8 | P, HLG, R HANDLING CHARGE, DORAVILLE TO SUPREME CORP-PRO FLEET DIV BACK TO FTWAYNE | 1998 | Provisional |
| WT9 | P, ORDER MODIFICATION, NAES FOR DOMESTIC DELIVERY | 1994 | Provisional |
| WTC | Tire & Wheel Inflator | — | Reference |
| WTG | Panel Center Instrument, Urban High Gloss, Solid Paint | — | Reference |
| WTH | Panel Center Instrument, DK Titanium, High Gloss, Metallic Paint | — | Reference |
| WTJ | Panel Center Instrument, DK Titanium, Graphic Film | — | Reference |
| WTK | Panel Center Instrument, Very DK Sleek Silver, Metallic Paint | — | Reference |
| WTN | Panel Center Instrument, Dual Color, Piano Black (outer) & Sprint (in | — | Reference |
| WTQ | Panel Center Instrument, DK Titanium High Gloss, Solid Paint | — | Reference |
| WTR | P, KIT, TIRE REPAIR, 20320 E 0 | — | GM sourced |
| WTS | Kit Tire Repair, Integrated Equipment | — | Reference |
| WTX | Fascia, front | 2026 | GM sourced |
| WU1 | P, SWITCH, I/P LP SHUTOFF | 1997 | GM sourced |
| WU2 | P, HLG, R HANDLING CHARGE, DORAVILLE TO MASTERACK-DIV LEGGETT & PLATT BACK TODORAVILLE | 1998 | Provisional |
| WU3 | P, HLG, R HANDLING CHARGE, DORAVILLE TO AMERICAN SUNROOF (ASC) | 1997 | Provisional |
| WU4 | P, PLANT OPERATION, NOT CERTIFIED FOR SALE OUTSIDE OF GM CORPORATION | 1989 | Provisional |
| WU5 | P, SWITCH, I/P LP DIMR | 1997 | GM sourced |
| WU6 | P, SALES PACKAGE, FIREHAWK DUAL LABEL | 1997 | Provisional |
| WU7 | Seat,third Custom | — | Reference |
| WU8 | P, SALES PACKAGE, CAMARO SS APPEARANCE AND PERFORMANCE, SINGLE LABEL this code has more than one documented meaning — filter by year | 1997 | GM sourced |
Using the master list
This is the full GM RPO code list we hold — every Regular Production Option code in the database, searchable by code or by description and filterable to a single model year. Most RPO lists on the internet run to a couple of hundred codes copied from one service manual. This one holds 24,366, and tells you where each meaning came from.
What an RPO code is
RPO stands for Regular Production Option. Every piece of factory equipment on a GM vehicle carries a three-character code, and the ones fitted to your truck are printed on the Service Parts Identification label in the glove box or on the door jamb. G80 is a locking differential, Z71 is an off-road suspension package, K05 is a block heater.
They matter because they are what the factory actually built, not what a listing claims. If you are buying a truck, the label settles the argument. If you are ordering parts, the axle and transmission codes decide which part fits.
Why the same code means different things
GM has reused these codes for decades and across every division. A code that means one thing on a 1978 pickup can mean something unrelated on a 2015 SUV, and plenty of entries in circulation come from bulk listings with no year and no document behind them.
So every entry here is labelled with where it came from. GM sourced means we hold an actual GM document for it. GM dated means it comes from the option master with a date attached. Reference means it is in general circulation with nothing dated behind it — still useful, but treat it as a lead rather than a fact. Filtering by your model year is the single best way to get an answer you can rely on.
Read the codes off your own label
If you have the sticker in front of you, the RPO decoder will read a photo of it and decode every code at once, checked against your model year.
FullSizeChevy.com is not affiliated with, endorsed by, or sponsored by General Motors. Chevrolet, GMC, Cadillac, Silverado, Sierra and related marks are trademarks of General Motors LLC and are used here only to identify applicable vehicles. RPO meanings vary by model year, platform and configuration — verify against your own label before buying parts.