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| 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 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 |
|---|---|---|---|
| Z3B | P, NPC, M, CONVERSION NAME PLT, EMBLEM "FORUM" | 1999 | Provisional |
| Z3E | P, NPC, M, CONVERSION NAME PLT, "SPORT" | 1998 | Provisional |
| Z3F | P, NPC, M, CONVERSION NAME PLT, "GL" | 1998 | Provisional |
| Z3G | P, NPC, M, CONVERSION NAME PLT, "CD" | 1998 | Provisional |
| Z3H | P, ORNAMENTATION, NAME PLATE "ADVANTAGE" | 1997 | Provisional |
| Z3J | P, NPC, M, CONVERSION NAME PLT, "TWEN" | 1998 | Provisional |
| Z3K | P, ORNAMENTATION, EMBLEM "EXPRESION" | 1997 | Provisional |
| Z3L | P, NPC, M, CONVERSION NAME PLT, EMBLEM "WORLD CUP" | 1998 | Provisional |
| Z3M | P, NPC, M, CONVERSION NAME PLT, "LIMITED", 20118 E 0 | — | Provisional |
| Z3P | P, NPC, M, CONVERSION NAME PLT, "VIVA" | 1998 | Provisional |
| Z3Q | P, ORNAMENTATION, EMBLEM "GRAND SLAM" | 1997 | Provisional |
| Z3R | P, NPC, M, CONVERSION NAME PLT, EMBLEM "MV6" | 1998 | Provisional |
| Z3S | P, NPC, M, CONVERSION NAME PLT, "ELITE" | 1998 | GM sourced |
| Z3T | P, ORNAMENTATION, EMBLEM "FRESH" | 1997 | Provisional |
| Z3U | P, ORNAMENTATION, EMBLEM "COMFORT" | 1997 | Provisional |
| Z3W | P, NPC, M, CONVERSION NAME PLT, EMBLEM "INDEPENDENT" | 1998 | Provisional |
| Z3Y | P, ORNAMENTATION, EMBLEM "ATLANTA" | 1997 | Provisional |
| Z3Z | P, ORNAMENTATION, EMBLEM "COMFORT PLUS" | 1997 | Provisional |
| Z40 | P, EQUIPMENT, GM OF CANADA PROCESSING OPTION FOR TRUCK | 1998 | Provisional |
| Z41 | Canadian Equipment Package this code has more than one documented meaning — filter by year | — | Reference |
| Z44 | Appearance Package Special Edition Z06 Crystal Red | — | Reference |
| Z45 | Denali Premium Suspension with Adaptive Ride Control | 2026 | GM sourced |
| Z47 | CONVERSION OPTION, CANADIAN CHEVROLET | — | Provisional |
| Z48 | FX Option(canadian) | — | Reference |
| Z49 | mandatory Canadian equipment modifications | 2000 | GM sourced |
| Z4B | P, APP, R, APPEARANCE PACKAGE, COLLECTOR SERIES, 20208 E 1 1, A | — | Provisional |
| Z4C | P, APP, R, APPEARANCE PACKAGE, 35TH ANNIVERSARY this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| Z4J | P, SGR, R, MERCHANDISED PKG, JEFF GORDON EDITION, 20621 E 1 | — | GM sourced |
| Z4M | P, SGR, R, MERCHANDISED PKG, INTIMIDATOR, 20621 E 1 | — | GM sourced |
| Z4Z | P, SGR, R, MERCHANDISED PKG, INDY PACE CAR, 20621 E 1 | — | GM sourced |
| Z50 | Canadian Pontiac Tempest(merchandising Option) | — | Reference |
| Z51 | P, PERFORMANCE PACKAGE, HANDLING | 1994 | GM sourced |
| Z52 | Merchandised Pkg Dry Sump System this code has more than one documented meaning — filter by year | — | Reference |
| Z53 | P, CSR, M, CLUSTER, INST, OIL, COOL TEMP, VOLTS this code has more than one documented meaning — filter by year | 1992 | GM sourced |
| Z54 | Corsica 'ltz'(1lt69 & Z54 = 1lz69) this code has more than one documented meaning — filter by year | — | Reference |
| Z55 | P, CHP, R, CHASSIS PACKAGE, BI-STATE REAL TIME DAMPING this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| Z56 | P, CHP, R, CHASSIS PACKAGE, POLICE CONVERSION this code has more than one documented meaning — filter by year | 1995 | GM sourced |
| Z57 | P, IDENTIFICATION, 1998 WHEEL BREAKPOINT INPLANT USE UNSOLD this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| Z58 | P, IDENTIFICATION, 1998 WHEEL BREAKPOINT FOR SOLD ORDERS this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| Z59 | Top,removable(black-textured) | — | Reference |
| Z5B | Seo Override OF Mv4 For Police & Taxi | — | Reference |
| Z5G | P, IDENTIFICATION, CALLAWAY ORDERS | 1990 | GM sourced |
| Z5J | Seo Override OF Rpo U25 Luggage Compt Lamp | — | Reference |
| Z5M | P, SALES PROCESSING OPT, MOTOR HOME SCHEDULING | 1991 | GM sourced |
| Z5T | Seo Override OF Lm1 For Police & Taxi | — | Reference |
| Z5U | Mirror Provisions Heated | — | Reference |
| Z5V | Mirror Provisions Blue Glass | — | Reference |
| Z5W | P, VEHICLE, WINNEBAGO SCHEDULING | 1990 | GM sourced |
| Z5X | P, MIRROR PROVISIONS, ARABIC LANGUAGE | 1995 | GM sourced |
| Z5Y | P, MIRROR PROVISIONS, O/S ETCHED WARNING | 1998 | GM sourced |
| Z5Z | Package,active Suspension(merchandising Option) | — | Reference |
| Z60 | Suspension Package, High Capacity this code has more than one documented meaning — filter by year | 2026 | GM sourced |
| Z61 | Trailer Provisions,special Equipment,h.d. W/rr Underun System | — | Reference |
| Z62 | Scottsdale / SLX trim | 1990 | GM sourced |
| Z64 | Model Conversion Ltz | — | Reference |
| Z65 | P, SALES PACKAGE, POWER, 10503 | — | Provisional |
| Z66 | P, APP, R, APPEARANCE PACKAGE, PREMIUM RIDE SUSPENSION, 125 | — | GM sourced |
| Z67 | SPEEDOMETER, DRIVEN GEAR ADAPTER/KEYS | — | Provisional |
| Z6A | Gooseneck / 5th Wheel Prep Package | 2026 | GM sourced |
| Z6B | Seo Override OF Rpo Ja2 Heavy Duty Brake | — | Reference |
| Z6E | Premium Capability Package with Active Response 4WD this code has more than one documented meaning — filter by year | 2026 | GM sourced |
| Z6X | Sales Package Off Road Performance | — | Reference |
| Z6Z | Floor Covering,full Length(black Rubber) | — | Reference |
| Z70 | Oldsmobile Bravada(z70) | — | Reference |
| Z71 | off-road suspension/package this code has more than one documented meaning — filter by year | 2026 | GM sourced |
| Z72 | P, TPK, R, TRAILER PROVISIONS, HITCH, BALL TYPE, L.D. this code has more than one documented meaning — filter by year | 1989 | GM sourced |
| Z73 | Trim,interior(special) | — | Reference |
| Z74 | C, APP, R, APPEARANCE PACKAGE, SONOMA GT this code has more than one documented meaning — filter by year | 1991 | GM sourced |
| Z75 | P, MAR, M, MARKET BRAND, CADILLAC, 10507 | — | GM sourced |
| Z76 | Chassis,special Commercial Camper Package | — | Reference |
| Z77 | Chevy Sport OR GMC Street Coupe | — | Reference |
| Z78 | Appearance Package | — | Reference |
| Z79 | C, APP, R, APPEARANCE PACKAGE, TYPHOON this code has more than one documented meaning — filter by year | 1991 | GM sourced |
| Z7A | Model Conversion this code has more than one documented meaning — filter by year | — | Reference |
| Z7B | P, MSM, R, MODEL CONVERSION, IMPALA SS, 10820 E 1 | — | GM sourced |
| Z7C | P, MSM, R, MODEL CONVERSION, MONTE CARLO HI-SPORT SS, 10820 E 1 | — | GM sourced |
| Z7D | P, APP, R, APPEARANCE PACKAGE, BRICKYARD 400, 20123 E 1 1, A | — | Provisional |
| Z7E | Model Conversion Chevrolet Lumina LS this code has more than one documented meaning — filter by year | — | Reference |
| Z7F | Model Conversion Chevrolet Monte Carlo | — | Reference |
| Z7G | Model Conversion Chevrolet Monte Carlo | — | Reference |
| Z7H | Model Conversion,chevrolet Lumina(merchandising Option)(1wm27 + Z7h =1 this code has more than one documented meaning — filter by year | — | Reference |
| Z7K | Pontiac Grand Prix 'se'(merchandising Option)(2wm19 + Z7k = 2wj19)(2wm37 + Z7k = 2wj37) | — | Reference |
| Z7L | Pontiac Grand Prix 'le'(merchandising Option)(2wm19 + Z7l = 2wh19) | — | Reference |
| Z7M | Pontiac Grand Prix 'gt' | — | Reference |
| Z7N | Pontiac Grand Prix 'ste'(merchandising Option)(2wm19 + Z7n = 2wt19) | — | Reference |
| Z7P | Oldsmobile Cutlass Supreme(merchandising Option) this code has more than one documented meaning — filter by year | — | Reference |
| Z7Q | Oldsmobile International Series(merchandising Option) this code has more than one documented meaning — filter by year | — | Reference |
| Z7R | P, MSM, R, MODEL CONVERSION | 1995 | GM sourced |
| Z7S | Oldsmobile Cutlass Supreme Convertible(merchandising Option)(3wm47 + Z7s = 3wt67) | — | Reference |
| Z7T | P, MSM, R, MODEL CONVERSION, PONTIAC GRAND PRIX 'GT2', 20422 E 1 this code has more than one documented meaning — filter by year | — | GM sourced |
| Z7U | P, MSM, R, MODEL CONVERSION, PONTIAC GRAND PRIX '367P', 20422 E 1 this code has more than one documented meaning — filter by year | — | GM sourced |
| Z7W | P, MSM, R, MODEL CONVERSION, PONTIAC GRAND PRIX 'SE1' | 1999 | GM sourced |
| Z7X | Suspension, Off-Road with 2 inch lift | 2026 | GM sourced |
| Z7Y | Model Conversion Buick Century Custom | — | Reference |
| Z7Z | Model Conversion Buick Century Limited | — | Reference |
| Z81 | basic camper group | 1990 | GM sourced |
| Z82 | Trailering equipment, heavy-duty this code has more than one documented meaning — filter by year | 2026 | GM sourced |
| Z83 | P, CHP, R, CHASSIS PACKAGE, SOLID SMOOTH RIDE this code has more than one documented meaning — filter by year | 1991 | GM sourced |
| Z84 | Cheyenne,high Sierra this code has more than one documented meaning — filter by year | — | Reference |
| Z85 | Suspension Package | 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.