← 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 601–640 of 640 codes beginning with Z. One meaning shown per code — the best-sourced one we hold. Search above for the rest.
| Code | Meaning | Years | Sourcing |
|---|---|---|---|
| ZX0 | P, SAA, M, SEATING ARRANGEMENT, 3 PASS, 10627 E 1 | — | GM sourced |
| ZX1 | P, SAA, M, SEATING ARRANGEMENT, DRIVER ONLY, HIGH BACK this code has more than one documented meaning — filter by year | 1990 | GM sourced |
| ZX2 | P, SAA, M, SEATING ARRANGEMENT, DRIVER & PASS, HIGH BACK this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| ZX3 | P, CHP, R, CHASSIS PACKAGE, MANUAL SELECT DAMPING this code has more than one documented meaning — filter by year | 1995 | GM sourced |
| ZX4 | C, GPK, R, WINDOW PKG, LH SIDE, RR DRS, SIDE RR DR this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| ZX5 | P, SAA, M, SEATING ARRANGEMENT, 12 PASS this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| ZX6 | P, GPK, R, WINDOW PKG, RR DRS, SIDE RR DR, SWING OUT this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| ZX7 | P, WAR, R, WARRANTY, 150,000 MILES, 5 YEARS this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| ZX8 | P, GVW OVERRIDE this code has more than one documented meaning — filter by year | 1991 | GM sourced |
| ZX9 | P, SPT, R, TIRE SPARE, W/WHEEL - DELETE this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| ZXN | Tire Spare P265/65r18-112s BW TL Oor | — | Reference |
| ZXR | Tire Spare Lt245/70r17/c BW ST TL AT | — | Reference |
| ZXT | Tire, spare LT265/70R17E all-terrain, blackwall | 2026 | GM sourced |
| ZXU | Tire Spare Lt265/70r17/e BW TL AT Export | — | Reference |
| ZY0 | Warranty 50, 000 Km, 2 Years | — | Reference |
| ZY1 | P, CCC, R, COLOR COMBINATION, SOLID | 1996 | GM sourced |
| ZY2 | conventional two-tone paint | 1990 | GM sourced |
| ZY3 | P, CCC, R, COLOR COMBINATION, TWO TONE, SPECIAL | 1997 | GM sourced |
| ZY4 | P, CCC, R, COLOR COMBINATION, TWO TONE, DELUXE | 1997 | GM sourced |
| ZY5 | P, CCC, R, COLOR COMBINATION, EXTERIOR, DECOR this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| ZY6 | P, CCC, R, COLOR COMBINATION, TWO TONE, TREATMENT this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| ZY7 | P, CCC, R, COLOR COMBINATION, TWO TONE, LOWER ACCENT this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| ZY8 | P, CCC, R, COLOR COMBINATION, TWO TONE, CUSTOM this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| ZY9 | Warranty 100,000 Km, 3 Years | — | Reference |
| ZYG | Tire, spare LT275/70R18 all-terrain, blackwall | 2026 | GM sourced |
| ZYH | Tire Spare P215/65r15/n Owl R/pe ST TL Hwy (9590776) | — | Reference |
| ZYJ | P, SPT, R, TIRE SPARE, LT215/85R16/C BL R/PE ST TL HWY this code has more than one documented meaning — filter by year | 1988 | GM sourced |
| ZYK | P, SPT, R, TIRE SPARE, LT215/85R16/D BL R/PE ST TL HWY this code has more than one documented meaning — filter by year | 1988 | GM sourced |
| ZYL | P, SPT, R, TIRE SPARE, LT215/85R16/D BL R/PE ST TL OOR this code has more than one documented meaning — filter by year | 1988 | GM sourced |
| ZYM | P, SPT, R, TIRE SPARE, LT235/85R16/D BL R/PE ST TL HWY this code has more than one documented meaning — filter by year | 1988 | GM sourced |
| ZYN | Tire Spare Lt235/85r16/e BL R/pe ST TL Hwy (9590803) | — | Reference |
| ZYR | P, SPT, R, TIRE SPARE, P245/50R17-98H BW R/PE ST TL AL3 | 1997 | GM sourced |
| ZYT | Tire Spare Lt235/85r16/e BL R/pe ST TL Oor (9590801) | — | Reference |
| ZZ0 | P, OWM, R, OWNERS MANUAL, ENGLISH & SPANISH | 1997 | Provisional |
| ZZ1 | P, OWM, R, OWNERS MANUAL, PORTUGUESE LANGUAGE | 1996 | Provisional |
| ZZ3 | P, SPP, R, PACKAGE, PICK-UP BOX-GMC 3500 HD | 1999 | Provisional |
| ZZ5 | P, ORNAMENTATION, EMBLEM "D20", 131 E 5, 5, A | — | Provisional |
| ZZ6 | P, CND, R, CONVENIENCE PKG, "DELUXE" PICKUP VERSION | 1995 | Provisional |
| ZZT | Tire, spare LT235/80R17E all-terrain | 2026 | GM sourced |
| ZZZ | P, VEHICLE, ASSEMBLE AS PER MEMORANDUM | 1996 | Provisional |
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.