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 101–200 of 458 codes beginning with N. One meaning shown per code — the best-sourced one we hold. Search above for the rest.

CodeMeaningYearsSourcing
N87 P, WHL, M, WHEEL, 18 X 8, ALUMINUM 1998 GM sourced
N88 P, WHL, M, WHEEL, 17 X 7.5, ALUMINUM, PREMIUM this code has more than one documented meaning — filter by year 1998 GM sourced
N89 P, WHL, M, WHEEL, 17 X 7.5, ALUMINUM, SPORT 1998 GM sourced
N8D Transmission Man 6 Spd, 85mm, 4.45 1st, 2.56 2nd, 1.53 3rd, 1.0 0 4th, 0.87 5th, 0.76 6th — Reference
N90 cast-aluminum wheels for C-series trucks 1990 GM sourced
N91 P, WCV, R, COVER, WHEEL, SIMULATED WIRE, LOCK this code has more than one documented meaning — filter by year 1997 GM sourced
N92 P, WCV, R, COVER, WHEEL, BOLT-ON 1997 GM sourced
N93 P, WHL, M, WHEEL, 17 X 7.5, ALUMINUM 1996 GM sourced
N94 P, WHL, M, WHEEL, 17 X 7.5, ALUMINUM, CHROME 1996 GM sourced
N95 P, WHL, M, WHEEL, 16 X 7, STEEL, STYLED 1998 GM sourced
N96 P, WHL, M, WHEEL, 16 X 8, ALUMINUM CAST this code has more than one documented meaning — filter by year 1996 GM sourced
N97 P, WHS, R, WHEEL SPARE, UNDERFLOOR STOWAGE this code has more than one documented meaning — filter by year 1999 GM sourced
N98 P, WHL, M, WHEEL, CHROME, VAR 2 this code has more than one documented meaning — filter by year 1984 GM sourced
N99 P, WHL, M, WHEEL, HEAVY DUTY this code has more than one documented meaning — filter by year 1984 GM sourced
NA1 P, EMISSION SYSTEM GVW, LESS THAN 8,500 LB this code has more than one documented meaning — filter by year 1998 GM sourced
NA2 P, EMS, M, EMISSION SYSTEM, GERMANY this code has more than one documented meaning — filter by year 1983 GM sourced
NA3 P, EMS, M, EMISSION SYSTEM, JAPAN this code has more than one documented meaning — filter by year 1994 GM sourced
NA4 P, EMISSION SYSTEM GVW, ABOVE 8,500 LB this code has more than one documented meaning — filter by year 1998 GM sourced
NA5 P, EMS, M, EMISSION SYSTEM, FEDERAL, TIER 0 this code has more than one documented meaning — filter by year 1993 GM sourced
NA6 P, EMS, M, EMISSION SYSTEM, HIGH ALTITUDE REQUIREMENTS this code has more than one documented meaning — filter by year 1983 GM sourced
NA7 P, EMS, M, EMISSION SYSTEM, EUROPEAN 1984 GM sourced
NA8 P, EMS, M, EMISSION SYSTEM, MEXICO DOMESTIC 1995 GM sourced
NA9 P, EVAPORATIVE SYSTEM, EMISSION this code has more than one documented meaning — filter by year 1991 GM sourced
NAA Rocker Protection, (dealer-installed) (LPO dealer-installed accessory) 2026 GM sourced
NAC P, IDENTIFICATION, ONBOARD REFUELING VAPOR RECOVERY 1999 GM sourced
NAG Cover, Wheel Bolt-on, Var 1 — Reference
NB1 P, EMS, M, EMISSION SYSTEM, CLOSED LOOP this code has more than one documented meaning — filter by year 1992 GM sourced
NB2 P, EMS, M, EMISSION SYSTEM, CALIFORNIA, TIER 0 this code has more than one documented meaning — filter by year 1991 GM sourced
NB3 P, EMS, M, EMISSION SYSTEM, ABOVE 10,000 LB GVW this code has more than one documented meaning — filter by year 1998 GM sourced
NB4 P, EMS, M, EMISSION SYSTEM, NOX 1992 GM sourced
NB5 Exhaust, single system, single-outlet this code has more than one documented meaning — filter by year 2026 GM sourced
NB6 P, EMS, M, EMISSION SYSTEM, CALIFORNIA, TIER 1 this code has more than one documented meaning — filter by year 1991 GM sourced
NB7 P, EMS, M, EMISSION SYSTEM, CALIFORNIA, TLEV (NOTE: NOT TO BE USED AFTER 2007MDL YR FOR DOMESTIC NAO PASS CAR & LT DUTY TRUCKS) this code has more than one documented meaning — filter by year 1999 GM sourced
NB8 Emissions override, California 2026 GM sourced
NB9 state-specific emissions override 2026 GM sourced
NBA P, ACCESSORY PACKAGE, #1, 10905 P, 1 1, A — Provisional
NBB P, ACCESSORY PACKAGE, #2, 10905 P, 1 1, A — Provisional
NBC P, ACCESSORY PACKAGE, #3, 10905 P, 1 1, A — Provisional
NBD P, ACCESSORY PACKAGE, #4, 10905 P, 1 1, A — GM sourced
NBE P, ACCESSORY PACKAGE, #5, 10905 P, 1 1, A — Provisional
NBF P, ACCESSORY PACKAGE, #6, 10905 P, 1 1, A — Provisional
NBG P, ACCESSORY PACKAGE, #7, 10905 P, 1 1, A — Provisional
NBH P, ACCESSORY PACKAGE, #8, 10905 P, 1 1, A — Provisional
NBI P, ACCESSORY PACKAGE, #9, 10905 P, 1 1, A — Provisional
NBJ P, ACCESSORY PACKAGE, #10, 10905 P, 1 1, A — Provisional
NBK P, ACCESSORY PACKAGE, #11, 10905 P, 1 1, A — Provisional
NBQ Exhaust Sporty, Chrome — Reference
NBR P, EXHAUST, STAINLESS TIP, 21004 — GM sourced
NC0 P, EQUIPMENT, EUROPEAN UNION COUNTRIES (EU) 1996 GM sourced
NC1 P, EMS, M, EMISSION SYSTEM, CALIFORNIA, LEV (NOTE: NOT TO BE USED AFTER 2007 MDL YR FOR DOMESTIC NAO PASS CAR & LT DUTY TRUCKS) this code has more than one documented meaning — filter by year 1999 GM sourced
NC2 P, EXH, R, EXHAUST SYSTEM, SINGLE HORIZONTAL this code has more than one documented meaning — filter by year 1989 GM sourced
NC3 P, TAILPIPE, MODIFICATIONS this code has more than one documented meaning — filter by year 1990 GM sourced
NC4 P, EQUIPMENT, CATALYTIC CONVERTER, NON-REGULATED 1995 Provisional
NC5 P, EXH, R, EXHAUST SYSTEM, DUAL VERTICAL TAILPIPES, CHROME this code has more than one documented meaning — filter by year 1983 GM sourced
NC6 P, EXH, R, EXHAUST SYSTEM, SPORTY this code has more than one documented meaning — filter by year 1983 GM sourced
NC7 Emissions override, Federal 2026 GM sourced
NC8 P, EMS, M, EMISSION SYSTEM, CALIFORNIA, ULEV (NOTE: NOT TO BE USED AFTER 2007MDL YR FOR DOMESTIC NAO PASS CAR & LT DUTY TRUCKS) this code has more than one documented meaning — filter by year 1999 GM sourced
NC9 P, EMS, M, EMISSION SYSTEM, CALIFORNIA, ZEV this code has more than one documented meaning — filter by year 1992 GM sourced
NCF Lock Child Security Feature - Delete — Reference
NCG Lock Electrical Child Lock System (rear Door Latch) — Reference
ND1 Door Fuel Fill, Chrome — Reference
ND3 P, LABEL, EMISSION, CONTROL this code has more than one documented meaning — filter by year 1991 GM sourced
ND4 P, TNK, M, FUEL TANK, 90L, 24 GAL 1997 GM sourced
ND5 P, TNK, M FUEL TANK, 189L, 50 GAL, LH, RECT, STEP this code has more than one documented meaning — filter by year 1984 GM sourced
ND6 P, EMS, M EMISSION SYSTEM, BRAZIL, CONAMA PHASE III 1999 Provisional
NDA Navigation Disc Data Not Installed — Reference
NDB Exhaust Dual, Round, Chrome, Visible — Reference
NDD FAMILY CODE, NAVIGATION DISC DATA, 10626 — Provisional
NE1 Emissions 2026 GM sourced
NE2 P, TNK, M FUEL TANK, 68L, 18 GAL, PLASTIC this code has more than one documented meaning — filter by year 1996 GM sourced
NE3 P, TNK, M FUEL TANK, 72L, 19 GAL, STEEL 1997 GM sourced
NE5 P, TNK, M FUEL TANK, 189L, 50 GAL, RH, RECT, STEP this code has more than one documented meaning — filter by year 1984 GM sourced
NE6 P, TNK, M FUEL TANK, 189L, 50 GAL, DUAL, RECT, STEP this code has more than one documented meaning — filter by year 1984 GM sourced
NE7 P, TNK, M FUEL TANK, 227L, 60 GAL, 20515 — GM sourced
NE9 Emission System Eec 09 — Reference
NEA Exhaust System Dual Tailpipe Extensions, Chrome — Reference
NEB Exhaust System Dual Tailpipe Extensions, Non-bright — Reference
NED Exhaust System Dual, Double RH & LH Tailpipe Extensions, Bright — Reference
NF1 P, EMS, M EMISSION SYSTEM, FEDERAL, LEV 1999 GM sourced
NF2 P, EMS, M EMISSION SYSTEM, FEDERAL, TIER 1 this code has more than one documented meaning — filter by year 1991 GM sourced
NF4 P, EMS, M EMISSION SYSTEM, CLEAN FUEL FLEET this code has more than one documented meaning — filter by year 1998 GM sourced
NF6 P, EMS, M EMISSION SYSTEM, FEDERAL, ZEV 1996 GM sourced
NF7 P, EMS, M EMISSION SYSTEM, FEDERAL, NLEV this code has more than one documented meaning — filter by year 1998 GM sourced
NF8 P, EMS, M EMISSION SYSTEM, FEDERAL, TLEV this code has more than one documented meaning — filter by year 1999 GM sourced
NF9 P, EMS, M EMISSION SYSTEM, GENERAL UNLEADED, 1201 this code has more than one documented meaning — filter by year — GM sourced
NG1 P, CER, R CERTIFICATION, EMISSION, GEOGRAPHICALLY RESTRICTED REGISTRATION FOR VEHICLES UP TO 6,000 LBS GVW, 920 — GM sourced
NG2 P, TNK, M FUEL TANK, COMBINATION, LH RECT, 35 GAL GASOLINE, 25 X 15, INCL STEP, AND RH, NAT GAS, 3,600PSI, 15,000 CU IN this code has more than one documented meaning — filter by year 1998 GM sourced
NG3 P, TNK, M FUEL TANK, COMBINATION, RH RECT, 35 GAL GASOLINE, AND LH, NATGAS, 3,600 PSI, 15,000 CU IN this code has more than one documented meaning — filter by year 1998 GM sourced
NG4 P, TNK, M FUEL TANK, COMBINATION, RH RECT, 60 GAL GASOLINE, AND LH, NAT GAS, 3,600 PSI, 15,000 CU IN this code has more than one documented meaning — filter by year 1998 GM sourced
NG5 P, REGISTRATION, EMISSION, CERTIFICATION, FIFTY STATE (50) this code has more than one documented meaning — filter by year 1994 GM sourced
NG6 P, TNK, M FUEL TANK, COMBINATION, 25 GAL(95L) & 15 GAL(57L), MIDSHIP, RECTANGULAR, COMPOSITE, 10725 — GM sourced
NG7 P, TNK, M FUEL TANK, 27 GAL (102 L) RH, 50 GAL (200 L) LH,, RECT STEEL, STEP, 10904 — GM sourced
NG8 P, TNK, M FUEL TANK, PROPANE, 45 GAL, RH, CYLINDRICAL, STEEL 1998 GM sourced
NG9 P, TNK, M FUEL TANK, PROPANE, 75 GAL, RH, CYLINDRICAL, STEEL 1999 GM sourced
NGT P, PLT, R PLANT CODE, INGERSOLL, ONT, CANADA (CAMI) 1997 Provisional
NH1 Fuel Tank,83 Liter — Reference
NH2 P, TNK, M FUEL TANK, 113L, 30 GAL this code has more than one documented meaning — filter by year 1985 GM sourced
NH4 Fuel Tank 40 Gal 151l, LH And RH Fill W/o Auxiliary Ports L — Reference
NH5 Fuel Tank 60 Gal, 227l, LH And RH Fill W/o Auxiliary Ports L — Reference
NH7 P, TNK, M FUEL TANK, 100L, 26.4 GAL 1998 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.

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