← 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 101–200 of 592 codes beginning with X. One meaning shown per code — the best-sourced one we hold. Search above for the rest.
| Code | Meaning | Years | Sourcing |
|---|---|---|---|
| X3Y | P, SCC, R, SEO COLOR, BLUE 25 | 1990 | Provisional |
| X3Z | P, SCC, R, SEO COLOR, BLUE 26 | 1990 | Provisional |
| X40 | P, EQUIPMENT, MISC EQUIP FOR CHILE (CKD) | 1998 | Provisional |
| X42 | P, BUILD UP, BODY ASSEMBLY FOR IRAQ | 1990 | Provisional |
| X44 | P, PARTS, NA SOURCED & SHIPPED TO OUTSIDE, SUPPLIER & CKD (GMCL CONTROLLED) | 1998 | Provisional |
| X45 | P, EQUIPMENT, MISC EQUIP FOR INDONESIA (CKD) | 1998 | Provisional |
| X46 | P, SALES PROCESSING OPT, #18 | 1998 | Provisional |
| X47 | P, SALES PROCESSING OPT, #19 | 1998 | Provisional |
| X48 | P, SALES PROCESSING OPT, #20 | 1998 | Provisional |
| X4A | P, SCC, R, SEO COLOR, BLUE 27 | 1990 | Provisional |
| X4B | P, SCC, R, SEO COLOR, BLUE 28 | 1990 | Provisional |
| X4C | P, SCC, R, SEO COLOR, GREEN 17 | 1990 | Provisional |
| X4D | P, SCC, R, SEO COLOR, BLUE 29 | 1990 | Provisional |
| X4E | P, SCC, R, SEO COLOR, BLUE 30 | 1990 | Provisional |
| X4F | P, SCC, R, SEO COLOR, BLUE 31 | 1990 | Provisional |
| X4G | P, SCC, R, SEO COLOR, GREEN 18 | 1990 | Provisional |
| X4H | P, SCC, R, SEO COLOR, GREEN 19 | 1990 | Provisional |
| X4I | P, SCC, R, SEO COLOR, GREEN 20 | 1990 | Provisional |
| X4J | P, SCC, R, SEO COLOR, GREEN 21 | 1990 | Provisional |
| X4K | P, SCC, R, SEO COLOR, GREEN 22 | 1990 | Provisional |
| X4L | P, SCC, R, SEO COLOR, GREEN 23 | 1990 | Provisional |
| X4M | P, SCC, R, SEO COLOR, GREEN 24 | 1990 | Provisional |
| X4N | P, SCC, R, SEO COLOR, GREEN 25 | 1990 | Provisional |
| X4P | P, SCC, R, SEO COLOR, GOLD 2 | 1990 | Provisional |
| X4Q | P, SCC, R, SEO COLOR, GREEN 26 | 1990 | Provisional |
| X4R | P, SCC, R, SEO COLOR, MED YELLOW | 1990 | Provisional |
| X4S | P, SCC, R, SEO COLOR, GREEN 27 | 1990 | Provisional |
| X4T | P, SCC, R, SEO COLOR, BLUE 32 | 1990 | Provisional |
| X4U | P, SCC, R, SEO COLOR, BLUE 33 | 1990 | Provisional |
| X4V | P, SCC, R, SEO COLOR, DK BRIGHT RED | 1997 | Provisional |
| X4W | P, SCC, R, SEO COLOR, TAN 1 | 1990 | Provisional |
| X4X | P, SCC, R, SEO COLOR, BROWN 5 | 1990 | Provisional |
| X4Y | P, SCC, R, SEO COLOR, IVORY | 1990 | Provisional |
| X4Z | P, SCC, R, SEO COLOR, BLUE 34 | 1990 | Provisional |
| X52 | P, EQUIPMENT, MISC EQUIPMENT FOR GUAM, PUERTO RICO/, US VIRGIN ISLANDS this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| X54 | P, ALARM, ENG OIL PRESSURE/COOLANT this code has more than one documented meaning — filter by year | 1991 | GM sourced |
| X56 | Bumper Construction,calif Label Compliance | — | Reference |
| X5Z | P, WAR, R, WARRANTY, ENGINE ONLY, 50,000 MILES, 3 YEARS this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| X62 | P, BRF, R, BUMPER FRT, CHANNEL, STEEL this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| X68 | U-joint Upgrade,main | — | Reference |
| X6W | P, HUB, LOCKING MANUAL | 1985 | GM sourced |
| X6X | Increased Load Capacity | — | Reference |
| X6Y | P, WAR, R, WARRANTY, ENGINE ONLY, 50,000 MILES, 4 YEARS this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| X6Z | P, HUB, LOCKING AUTOMATIC | 1985 | GM sourced |
| X78 | Peculiar Equipment-columbia | — | Reference |
| X79 | P, VEHICLE INSPECTION, WEIGHT VERIFICATION | 1991 | GM sourced |
| X80 | P, PLATE, GVW RATING this code has more than one documented meaning — filter by year | 1986 | GM sourced |
| X81 | P, SALES INCENTIVE, PRICE LEADER this code has more than one documented meaning — filter by year | 1990 | GM sourced |
| X87 | P, MAR, M, MARKET BRAND, CHEVROLET (OPEL), 10507 E, 0 | — | Provisional |
| X88 | P, MAR, M, MARKET BRAND, CHEVROLET, 10507 this code has more than one documented meaning — filter by year | — | GM sourced |
| X90 | P, TRANSFER CHARGE, POOL & TRUCK CENTER (NEW TRUCK) | 1998 | GM sourced |
| X92 | P, SALES PROCESSING OPT, GOVERNMENT ORDER | 1991 | GM sourced |
| X96 | P, SALES INCENTIVE, FULL CONTENT PACKAGE | 1990 | GM sourced |
| X97 | P, SALES INCENTIVE, ENHANCEMENT PACKAGE | 1990 | GM sourced |
| X9K | P, WAR, R, WARRANTY, ENGINE ONLY, 100,000 MILES, 4 YEARS this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| XA0 | P, EQC, R, EQUIPMENT ADDITIONAL, BOLIVIA | 1996 | Provisional |
| XA1 | P, EQC, R, EQUIPMENT ADDITIONAL, CHINA | 1996 | GM sourced |
| XA2 | P, CHASSIS, STAMPING, NUMBER | 1992 | GM sourced |
| XA3 | P, EQUIPMENT, OPEL BADGE SALES | 1992 | GM sourced |
| XA4 | P, LOCAL, 0029839 | 1992 | GM sourced |
| XA5 | P, EQC, R, EQUIPMENT ADDITIONAL, AUSTRALIA (USE B13 IN FUTURE) | 1998 | Provisional |
| XA6 | P, LAG, R, LABEL, EEC COMPLIANCE this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| XA7 | heated windshield-washer-fluid system | 2016 | GM sourced |
| XA8 | P, LOCAL, 0029843 | 1992 | GM sourced |
| XA9 | P, PLATE, VEHICLE IDENTIFICATION-NON EEC TERRITORIES | 1992 | GM sourced |
| XAA | Tire Front P255/45zr17 BL R/pe ST TL Hw4 | — | Reference |
| XAB | P, FTR, M, TIRE FRONT, 245/40ZR17-95Y BW ST TL HW4, 20911 | — | GM sourced |
| XAC | P, FTR, M, TIRE FRONT, P245/40ZR18-94Y BW ST TL HW4, 20911 | — | Provisional |
| XAN | P, FTR, M, TIRE FRONT, P265/70R17-113S BW R/PE ST TL AL2 this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| XAP | P, FTR, M, TIRE FRONT, 7.50R-16/F 12PR BL R/ST TT HWY | 1997 | Provisional |
| XAQ | P, FTR, M, TIRE FRONT, P265/70R17-113H BW R/PE ST TL AL2 this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| XAS | P, FTR, M, TIRE FRONT, P265/70R17-113S WOL R/PE ST TL AL2 this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| XAU | Tire Front- P275/40 Zr17/n BL R/pe ST TL Hw4 (9591413) | — | Reference |
| XAX | Tire Front P265/75r16 SL 114t BW AT | — | Reference |
| XB1 | P, EQC, R, EQUIPMENT ADDITIONAL, POLAND this code has more than one documented meaning — filter by year | 1996 | GM sourced |
| XB2 | P, EQC, R, EQUIPMENT ADDITIONAL, HUNGARY this code has more than one documented meaning — filter by year | 1996 | GM sourced |
| XB5 | P, STEPS, SILL, SIDE | 1992 | GM sourced |
| XB6 | P, EQC, R, EQUIPMENT ADDITIONAL, CZECHOSLOVAKIA | 1996 | GM sourced |
| XB8 | P, EQC, R, EQUIPMENT ADDITIONAL, ROMANIA this code has more than one documented meaning — filter by year | 1996 | GM sourced |
| XBB | Tire Front P235/70r15 Wol R/pe ST TL Oor 102s | — | Reference |
| XBF | P, FTR, M, TIRE FRONT, P235/70R15-102S BW R/PE ST TL ALS this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| XBG | P, FTR, M, TIRE FRONT, P235/70R15-102S WOL R/PE ST TL ALS this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| XBH | Tire Front P245/40zr18 BW Hw4 (emt) | — | Reference |
| XBK | Tire All P245/40zr18 SL (93y) BW Rf4 (front) P285/35zr19 SL this code has more than one documented meaning — filter by year | — | Reference |
| XBL | P, FTR, M, TIRE FRONT, P265/70R17-113H BW TL ST OOR, 20405 | — | GM sourced |
| XBN | P, FTR, M, TIRE FRONT, LT245/75R16/C BW R/PE ST TL OOR this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| XBO | P, FTR, M, TIRE FRONT, 215/80R16 6PR BL TL RADIAL | 1997 | Provisional |
| XBX | P, FTR, M, TIRE FRONT, LT245/75R16/C WOL R/PE ST TL OOR this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| XBY | P, FTR, M, TIRE FRONT, LT245/75R16/D BW R/PE ST TL A/T 114S | 1997 | Provisional |
| XC1 | P, DECAL, FRONTERA SPORT | 1999 | GM sourced |
| XC2 | P, PLATE, VEHICLE IDENTIFICATION-EEC TERRITORIES | 1992 | GM sourced |
| XC3 | P, EQUIPMENT, WIRING HARNESS, RADIO- TELEMATIC & NAVIGATION FEATURES SUBSTITUTE OPTION W/O PHONE, 530 | — | Provisional |
| XC4 | P, HOOK, TOW, FRT, ADDITIONAL | 1997 | GM sourced |
| XC5 | P, PROTECTOR, BAR, BODY SIDE this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| XC6 | P, LOCAL, 0029913 | 1992 | GM sourced |
| XC9 | P, LOCAL, 0029916 | 1992 | GM sourced |
| XCA | P, FTR, M, TIRE FRONT, P205/75R15-97S WOL R/PE ST TL ALS this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| XCB | P, FTR, M, TIRE FRONT, P235/55R16-96T BW R/PE ST TL AL2 this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| XCC | P, FTR, M, TIRE FRONT, P255/70R16 BW R/PE ST TL ALS this code has more than one documented meaning — filter by year | 1996 | GM sourced |
| XCE | Tires, 275/50R22SL all-season, blackwall this code has more than one documented meaning — filter by year | 2026 | 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.