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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 501–600 of 746 codes beginning with C. One meaning shown per code — the best-sourced one we hold. Search above for the rest.
| Code | Meaning | Years | Sourcing |
|---|---|---|---|
| CJ4 | Climate control, tri-zone automatic, with individual climate settings | 2019 | Reference |
| CJ5 | P, HTR, M, HVAC SYSTEM, AIR CONDITIONING, FRT & RR, MANUAL CONTROLS this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| CJ6 | P, CTY, R, COUNTRY, IRELAND | 1998 | GM sourced |
| CJ7 | P, CTY, R, COUNTRY, COMMONWEALTH OF INDEPENDENT STATES (BELARUS,RUSSIAUKRAINE, ESTONIA, LATVIA, LITHUANIA, MOLDAVIA,ETC 9 9 0 2 1 6 P, 0 | — | GM sourced |
| CJ8 | P, CTY, R, COUNTRY, BULGARIA | 1998 | GM sourced |
| CJ9 | P, CTY, R, COUNTRY, ROMANIA | 1998 | GM sourced |
| CJA | P, RKR, R, MOLDING ROCKER, BODY COLOR, W/O WEATHERSTRIP, 10116 E, 5 | — | Provisional |
| CJB | P, HLG, R, HANDLING CHARGE, FAIRFAX ASM TO PERFORMANCE TRIM CORP TO FAIRFAX ASM | 1998 | Provisional |
| CJD | Eurosport VR | — | Reference |
| CK0 | P, EQC, R, EQUIPMENT ADDITIONAL, IRELAND | 1998 | GM sourced |
| CK1 | P, EQC, R, EQUIPMENT ADDITIONAL, PAKISTAN | 1998 | GM sourced |
| CK2 | P, CTY, R, COUNTRY, YEMEN this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| CK3 | P, CTY, R, COUNTRY, INDIA | 1994 | GM sourced |
| CK4 | P, CTY, R, COUNTRY, GREECE | 1998 | GM sourced |
| CK5 | P, CTY, R, COUNTRY, PAKISTAN | 1998 | GM sourced |
| CK6 | P, CTY, R, COUNTRY, KENYA this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| CK7 | P, CTY, R, COUNTRY, SINGAPORE this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| CK8 | P, CTY, R, COUNTRY, MALAYSIA this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| CK9 | P, CTY, R, COUNTRY, INDONESIA this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| CKA | Equipment Additional Bulgaria | — | Reference |
| CKD | P, VEHICLE, COMPLETELY KNOCKED DOWN (CKD) | 1996 | GM sourced |
| CKE | Vehicle,special Order Build | — | Reference |
| CKF | GVWR, 11,025 lbs. (5001 kg) | 2026 | GM sourced |
| CKJ | GVWR, 10,950 lbs. (4967 kg) | 2026 | GM sourced |
| CKM | GVWR, 10,960 lbs. (4971 kg) | 2026 | GM sourced |
| CKR | Plant Code Changwon, Korea | — | Reference |
| CL0 | P, CTY, R, COUNTRY, VIETNAM this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| CL1 | P, EQC, R, EQUIPMENT ADDITIONAL, KENYA | 1998 | GM sourced |
| CL2 | P, EQC, R, EQUIPMENT ADDITIONAL, CZECH REPUBLIC | 1998 | GM sourced |
| CL3 | P, EQC, R, EQUIPMENT ADDITIONAL, SLOVAKIA | 1998 | GM sourced |
| CL4 | P, CTY, R, COUNTRY, UZBEKISTAN this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| CL5 | P, CTY, R, COUNTRY, PERU this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| CL6 | P, CTY, R, COUNTRY, BOLIVIA this code has more than one documented meaning — filter by year | 1994 | GM sourced |
| CL7 | P, CTY, R, COUNTRY, URUGUAY this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| CL8 | P, CTY, R, COUNTRY, PARAGUAY this code has more than one documented meaning — filter by year | 1994 | GM sourced |
| CL9 | P, CTY, R, COUNTRY, HONG KONG | 1998 | GM sourced |
| CLC | Family Code, Cluster Color | 1999 | GM dated |
| CLP | Family Code, Pilot Shaft | 1988 | GM dated |
| CLR | Cooler Food And Beverage | — | Reference |
| CLS | Country South America(bolivia,chile,colombia,ecuador,peru,uruguay,vene | — | Reference |
| CLU | Family Code, Clutch | 1988 | GM dated |
| CM0 | P, FIN, R, FLEET INCENTIVE, BRICE BUILDING COMPANY (C/H/W-TRK CK), 10501 | — | Provisional |
| CM1 | P, FIN, R, FLEET INCENTIVE, CGU INSURANCE (C/H/J/L/N/W-TRK CKGMLST), 607 | — | Provisional |
| CM2 | P, FIN, R, FLEET INCENTIVE, SUN PLUMBING (TRK CKG), 21030 | — | Provisional |
| CM3 | P, FIN, R, FLEET INCENTIVE, CHICAGO BRIDGE AND IRON CO. (W -TRK CK), 10627 | — | Provisional |
| CM4 | P, FIN, R, FLEET INCENTIVE, HENSEL PHELPS CONSTRUCTION (W -TRK CK), 10627 this code has more than one documented meaning — filter by year | — | GM sourced |
| CM5 | P, FIN, R, FLEET INCENTIVE, TRW | 1989 | GM sourced |
| CM6 | P, FIN, R, FLEET INCENTIVE, LENNOX INDUSTRIES, INC (W/U -TRK CKGMST), 10628 | — | Provisional |
| CM7 | P, RDC, R, ROOF, CONVERTIBLE, FOLDING, POWER this code has more than one documented meaning — filter by year | 1998 | Provisional |
| CM8 | Fleet Incentive Motion Industries this code has more than one documented meaning — filter by year | — | Reference |
| CM9 | P, FIN, R, FLEET INCENTIVE, GLOBE RENTAL CO. (C/G/H/W -TRK CKST), 10723 | — | Provisional |
| CMA | Ornamentation Intr I/p Pad, Soft Touch Paint DK Titanium | — | Reference |
| CMD | P, PLT, R, PLANT CODE, FLINT, MI, USA (TRK) this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| CMG | Fleet Program Canadian Mining | — | Reference |
| CMM | Ornamentation Intr I/p Tray, Fresh Green Lime | — | Reference |
| CMQ | Ornamentation Intr I/p Pad, Morello Red | — | Reference |
| CMR | Ornamentation Intr I/p Tray, Green Cocktail | — | Reference |
| CMS | Ornamentation Intr I/p Tray, Honey Mellow Yellow | — | Reference |
| CMU | Ornamentation Intr I/p Tray, Bluebell Blue | — | Reference |
| CMV | Ornamentation Intr I/p Tray, Olympic White | — | Reference |
| CMY | Ornamentation Intr I/p Pad, Cocoa | — | Reference |
| CN0 | P, FIN, R, FLEET INCENTIVE, ALL AMERICA TERMITE & PEST CONTROL (TRK CKGMST) | 1998 | GM sourced |
| CN1 | P, FIN, R, FLEET INCENTIVE, HELENA CHEMICAL (H/U/W-TRK CKST), 20801 | — | Provisional |
| CN2 | P, FIN, R, FLEET INCENTIVE, CENTURY TEL (W -TRK CKGMLST), 10723 | — | Provisional |
| CN3 | P, FIN, R, FLEET INCENTIVE, BORAL INDUSTRIES (G/H/W -TRK CKGST), 10628 | — | Provisional |
| CN4 | P, FIN, R, FLEET INCENTIVE, HOOD COMPANIES, INC. (H/W-TRK CKML), 10131 | — | Provisional |
| CN5 | P, FIN, R, FLEET INCENTIVE, XTO COMMUNICATIONS (B/W -TRK CK), 10910 | — | Provisional |
| CN6 | P, FIN, R, FLEET INCENTIVE, TETRA TECHNOLOGIES, INC (H/W-TRK CKST), 20206 | — | Provisional |
| CN7 | P, FIN, R, FLEET INCENTIVE, SAFEWAY COMPANY (B/H/J/L/N/W-TRK CKGMLST) | 1998 | GM sourced |
| CN8 | P, FIN, R, FLEET INCENTIVE, WALGREEN, INC (N/S/U/W-TRK CKGMLST), 20918 | — | Provisional |
| CN9 | P, FIN, R, FLEET INCENTIVE, CORNERSTONE PROPANE (N/W-TRK CK), 20930 | — | Provisional |
| CND | Family Code, Convenience Pkg | 1989 | GM dated |
| CNE | P, CONTROL, INTERIM CHANGE, ENGINE, 10911 | — | GM sourced |
| CNK | C, EQUIPMENT, SPECIAL ENGINE WIRING HARNESS, 323 | — | GM sourced |
| CNT | Holder,ticket | — | Reference |
| CNV | P, CONTROL, INTERIM CHANGE this code has more than one documented meaning — filter by year | 1991 | GM sourced |
| CNX | Interim Design Change:vehicles 'w/cnx' Best Identified BY Coolant Overflow Bottle Located ON | — | Reference |
| CNY | P, COMPRESSOR, AIR CONDITIONING, SANDEN this code has more than one documented meaning — filter by year | 1991 | GM sourced |
| CNZ | P, COMPRESSOR, AIR CONDITIONING, NIPPONDENSO this code has more than one documented meaning — filter by year | 1994 | GM sourced |
| COA | P, PLT, R, PLANT CODE, ANTWERPEN 1, BELGIUM | 1997 | GM sourced |
| COB | P, PLT, R, PLANT CODE, ANTWERPEN 2, BELGIUM this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| COL | P, COOLER, INTERIOR, WATER, NON-ELECTRIC, 410 | — | GM sourced |
| COP | P, CONTROL, INTERIM CHANGE, (OCCUPANT PROTECTION), 20801 | — | GM sourced |
| COR | P, PLT, R, PLANT CODE, CORDOBA, ARGENTINA | 1997 | Provisional |
| COV | P, COVER, TAIL LAMP LENS this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| CP0 | P, FIN, R, FLEET INCENTIVE, SAINT GOBAIN CORP (C/E/F/G/H/J/K/M/N/S/U/W/Y-TRK CGMLPST) | 1999 | GM sourced |
| CP1 | P, FIN, R, FLEET INCENTIVE, BESTFOODS (C/G/H/K/N/U/W-TRK CKGML) | 1999 | GM sourced |
| CP2 | P, FIN, R, FLEET INCENTIVE, LES SCHWAB TIRES (-TRK CKGST), 10629 | — | Provisional |
| CP3 | P, FIN, R, FLEET INCENTIVE, MATSUSHITA ELECTRIC CORP OF AMERICA (C/H/L/N/U/W) this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| CP4 | P, FIN, R, FLEET INCENTIVE, FRU-CON CONSTRUCTION CORP. (B/U/W-TRK CKST), 20813 | — | Provisional |
| CP5 | P, FIN, R, FLEET INCENTIVE, POLYONE CORP (B/C/G/H/J/U/W -TRK CKGMLST), 10723 | — | Provisional |
| CP6 | Fleet Incentive Central Locating Service (-trk Mpst) this code has more than one documented meaning — filter by year | — | Reference |
| CP7 | P, FIN, R, FLEET INCENTIVE, SCHWARZ PHARMA (S/U/W), 21023 | — | Provisional |
| CP8 | P, FIN, R, FLEET INCENTIVE, WHITE CASTLE SYSTEM (U/W-TRK CKML), 20912 | — | Provisional |
| CP9 | P, FIN, R, FLEET INCENTIVE, XSERV, INC. (TRK CK), 20912 | — | Provisional |
| CPG | Family Code, Camper Provisions | 1989 | GM dated |
| CPM | Ornamentation Intr, Door Trim Lwr, Leather | — | Reference |
| CPO | P, FIN, R, FLEET INCENTIVE, DAWN FOODS (H/U/W-TRK CKST), 10827 | — | Provisional |
| CQ0 | P, FIN, R, FLEET INCENTIVE, MEDIQ (U-TRK GMLST), 10815 | — | Provisional |
| CQ1 | P, FIN, R, FLEET INCENTIVE, CHEMCENTRAL (B/C/G/H/W), 10820 | — | 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.