GM RPO Code Database

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By FullSizeChevy.com Updated

Search the code list

24,366
codes on file
51,776
documented meanings
1973–2026
model years

Type a code, or describe the option in words. Every entry says where the meaning came from and which years we hold it for, because an RPO code can mean different things in different eras and a list that hides that is worse than no list.

CodeMeaningYearsSourcing
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 201–300 of 458 codes beginning with N. One meaning shown per code — the best-sourced one we hold. Search above for the rest.

CodeMeaningYearsSourcing
NH8 P, TNK, M FUEL TANK, 70L, 18.5 GAL 1998 GM sourced
NH9 P, TNK, M FUEL TANK, 227L, 60 GAL, RH, RECT this code has more than one documented meaning — filter by year 1984 GM sourced
NHT Max Trailering Package this code has more than one documented meaning — filter by year 2026 GM sourced
NJ0 Steering Power, Non-variable Ratio, Electric Reduced Rack Travel — Reference
NJ1 Steering Power, Non-variable Ratio, Electric — Reference
NJ2 P, TNK, M FUEL TANK, TEMPORARY this code has more than one documented meaning — filter by year 1985 GM sourced
NJ3 P, TNK, M FUEL TANK, 450L, DIESEL, LH, CYLINDRICAL, ALUMIN, TRUCK, 128 E 8 — Provisional
NJ4 P, TNK, M FUEL TANK, 450L, DIESEL, DUAL LH/RH, CYLINDRICAL, ALUMIN, 128 E 8 — Provisional
NJ5 P, TNK, M FUEL TANK, 300L, 79 GAL, LH OR RH, SINGLE, PLASTIC 1999 Provisional
NJ6 P, TNK, M FUEL TANK, 300L, 79 GAL, DUAL, PLASTIC 1999 Provisional
NJ7 P, TNK, M FUEL TANK, 27 GAL (102 L) RH, 53 GAL (200 L) LH, RECT, STEEL, 10510 — GM sourced
NJ8 P, TNK, M FUEL TANK, 50 GAL (201 L) DUAL, RECT, STEEL, 10904 — GM sourced
NJ9 P, TNK, M FUEL TANK, 80 GAL (304 L), LH OR RH FILL, 607 — GM sourced
NK1 P, TNK, M FUEL TANK, 95L, 25 GAL, PLASTIC this code has more than one documented meaning — filter by year 1998 GM sourced
NK2 P, TNK, M FUEL TANK, 46L, 12 GAL, METAL, 224 E 8 — GM sourced
NK3 sport steering wheel 1990 GM sourced
NK4 P, SWL, M STEERING WHEEL, SPORT LEATHER this code has more than one documented meaning — filter by year 1984 GM sourced
NK5 Steering wheel, urethane this code has more than one documented meaning — filter by year 2026 GM sourced
NK6 P, TNK, M FUEL TANK, 50 GAL (201 L) LH, RECT, STEEL, 10904 — GM sourced
NK7 P, TNK, M FUEL TANK, 117L, 31 GAL this code has more than one documented meaning — filter by year 1983 GM sourced
NK8 P, TNK, M FUEL TANK, 50 GAL (201 L) RH, RECT, STEEL, 10904 — GM sourced
NK9 C, TNK, M FUEL TANK, 189L, 50 GAL, RH, RECT, STEEL this code has more than one documented meaning — filter by year 1997 GM sourced
NKB Steering Wheel Base Vinyl — Reference
NKC Active Noise Cancellation 2026 GM sourced
NKR Active Noise Cancellation 2026 GM sourced
NL0 P, TNK, M FUEL TANK, 50 GAL (189L), LH, RECT, STEEL, 607 — GM sourced
NL1 P, TNK, M FUEL TANK, 132L, 35 GAL this code has more than one documented meaning — filter by year 1993 GM sourced
NL2 P, TNK, M FUEL TANK, AUXILIARY this code has more than one documented meaning — filter by year 1992 GM sourced
NL3 P, TNK, M FUEL TANK, NATURAL GAS 1998 GM sourced
NL4 P, TNK, M FUEL TANK, NATURAL GAS, DUAL, 3,600 PSI, 30,000 CU IN, COMBINED this code has more than one documented meaning — filter by year 1998 GM sourced
NL5 P, TNK, M FUEL TANK, 50 GAL (189L), DUAL, RECT, STEEL, 607 — GM sourced
NL6 P, TNK, M FUEL TANK, 49L, 13 GAL, SINGLE this code has more than one documented meaning — filter by year 1997 GM sourced
NL7 P, TNK, M FUEL TANK, 125L, 33 GAL this code has more than one documented meaning — filter by year 1983 GM sourced
NL8 P, TNK, M FUEL TANK, 132L, 35 GAL, LH, RECT, STEEL this code has more than one documented meaning — filter by year 1988 GM sourced
NL9 P, TNK, M FUEL TANK, 132L, 35 GAL, RH, RECT, STEEL this code has more than one documented meaning — filter by year 1992 GM sourced
NLA Fuel Tank 121l, 32 Gal — Reference
NLB Fuel Tank 121l, 32 Gal, LH Fill W/o Auxiliary Ports — Reference
NLD Fuel Tank 151l, 40 Gal, LH Fill With Auxiliary Ports — Reference
NLE Fuel Tank 227l, 60 Gal, LH Fill With Auxiliary Ports — Reference
NLF Fuel Tank 304l, 80 Gal, LH Fill With Auxiliary Ports — Reference
NM1 Emission System,switzerland,sweden — Reference
NM2 P, EMS, M EMISSION SYSTEM, EXPORT, LEADED FUEL 1995 GM sourced
NM4 Emission System Korean, Type3, Lev — Reference
NM5 Emission System,non-closed Loop(canada) — Reference
NM6 Emission System,canada Recalibration — Reference
NM8 P, LEADED FUEL SYSTEM, COMPATIBLE this code has more than one documented meaning — filter by year 1992 GM sourced
NM9 Emission System,diesel,external Egr — Reference
NN1 Emission System,european Stage Iii,unleaded Fuel — Reference
NN2 Emission System,korea 2000 — Reference
NN3 Emission System,single Bed Bead Converter — Reference
NN4 P, TNK, M FUEL TANK, 60 GAL, (227L), 607 — GM sourced
NN5 P, EMISSION OVERRIDE, CALIFORNIA SYSTEM, FEDERAL OFFSET VEHICLE this code has more than one documented meaning — filter by year 1990 GM sourced
NN6 P, EMISSION OVERRIDE, DIESEL FUEL, EXPORT this code has more than one documented meaning — filter by year 1992 GM sourced
NN7 Lock,fuel Filler Door(delete) — Reference
NN8 P, EMISSION OVERRIDE, UNLEADED FUEL, EXPORT 1991 GM sourced
NN9 Emission System,leaded Fuel(export) — Reference
NNA P, TNK, M FUEL TANK, 304L, 80 GAL, SPACE SAVER 1997 GM sourced
NNB P, TNK, M FUEL TANK, 378L, 100 GAL this code has more than one documented meaning — filter by year 1997 GM sourced
NNC Steering Wheel,leather/wood, 4 Spokes — Reference
NNK P, PARTS PKG, EXTENDED CAPACITY FUEL TANK, 20419 — GM sourced
NNM Steering Power, Modified — Reference
NNQ P, TNK, M FUEL TANK, 50 GAL (201L), DUAL, RECT, STEEL, STEP, 10904 — GM sourced
NNR Plant Code Nizhniy Novgorod, Russia — Reference
NNV P, TNK, M FUEL TANK, 50 GAL (201L), LH, RECT, STEEL, STEP, 10904 — GM sourced
NNW P, TNK, M FUEL TANK, 50 GAL (201L), RH, RECT, STEEL, STEP, 10904 — GM sourced
NNZ Control Steering Wheel, Hvac, Redundant Controls — Reference
NOR P, PLT, R PLANT CODE, NORWICH, ENGLAND 1999 Provisional
NOT Not For — Reference
NP0 Transfer case, active 2026 GM sourced
NP1 electric-shift two-speed transfer case 2007 GM sourced
NP2 manual-shift two-speed transfer case 2007 GM sourced
NP3 all-wheel-drive transfer case 2007 GM sourced
NP4 P, TCD, R TRANSFER CASE, ACTIVE, ALL WHEEL DRIVE (AWD) this code has more than one documented meaning — filter by year 1994 GM sourced
NP5 Steering wheel, leather-wrapped this code has more than one documented meaning — filter by year 2026 GM sourced
NP6 P, PROVISIONS, TRANSFER CASE, EXPORT this code has more than one documented meaning — filter by year 1996 GM sourced
NP7 P, SCL, R STEERING COLUMN, EEC APPROVED this code has more than one documented meaning — filter by year 1984 GM sourced
NP8 active push-button two-speed transfer case 2007 GM sourced
NP9 P, WCV, R COVER, WHEEL, - DELETE 1998 Provisional
NPC Family Code, Conversion Name Plt 1991 GM dated
NPD P, CAP, EXHAUST STACK RAIN this code has more than one documented meaning — filter by year 1997 GM sourced
NPE P, EQUIPMENT, EXHAUST RESTRICTOR, ENGINE WARM-UP this code has more than one documented meaning — filter by year 1995 GM sourced
NPG P, SHIELD, NOISE ABATEMENT this code has more than one documented meaning — filter by year 1990 GM sourced
NPH Exhaust System Heavy Duty — Reference
NPL P, PLATE, NAME - DELETE this code has more than one documented meaning — filter by year 1998 GM sourced
NPM Exhaust System Dual Downturn Tailpipe — Reference
NPP Active Exhaust, Dual, sport-mode enabled 2026 GM sourced
NPQ P, TNK, M FUEL TANK, 144L, 35 GAL, LH, RECT, STEEL, STEP, 10904 — GM sourced
NPT P, EXH, R EXHAUST SYSTEM, SINGLE HORIZONTAL MUFF W/VERTICAL TAILPIPE CAB MOUNTED this code has more than one documented meaning — filter by year 1997 GM sourced
NPU P, EXH, R EXHAUST SYSTEM, SINGLE HORIZONTAL MUFFLER, TRANSVERSE MOUNTED, RR EXIT this code has more than one documented meaning — filter by year 1998 GM sourced
NPV P, EXH, R EXHAUST SYSTEM, SINGLE VERTICAL MUFF & TAILPIPE CAB MOUNTED, 20412 — GM sourced
NPW P, TNK, M FUEL TANK, 144L, 35 GAL, DUAL, RECT, STEEL, STEP, 10904 — GM sourced
NPY P, EXH, R EXHAUST SYSTEM, SINGLE HORIZONTAL MUFF W/VERTICAL TAILPIPE, LH CAB MOUNTING this code has more than one documented meaning — filter by year 1986 GM sourced
NQ1 P, WCV, R COVER, WHEEL, FLUSH, VAR 10, 20610 E 0 — GM sourced
NQ2 Cover, Wheel Flush, Var 11 — Reference
NQ3 Fuel Tank 35l, 9gal — Reference
NQ5 Cap Trans Cont Lever, Cap Console, Polar Silver — Reference
NQ6 Transfer Case 2 Spd, Active, Part Time 4wd, L/h Drop, Low Ratio 2.72:1 — Reference
NQ7 Transfer Case 2 Spd, Switch Activated, Part Time 4wd, L/h Drop Low Ratio 2.72:1 — Reference
NQA Control Steering Wheel, 4 Spokes, Deluxe (gmdat) — Reference
NQB Control Steering Wheel, Leather Wrapped (gmdat) — Reference

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.

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