← 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 1–100 of 458 codes beginning with N. One meaning shown per code — the best-sourced one we hold. Search above for the rest.
| Code | Meaning | Years | Sourcing |
|---|---|---|---|
| N02 | P, TNK, M FUEL TANK, 63 L, 17 GAL | 1998 | Provisional |
| N03 | P, LOCK CONTROL, SIDE DR, WINDOW, RR COMPT LID, CNSL SWITCH, ELEC | 1999 | Provisional |
| N04 | Lock Control Anti Theft Cover, Latch System | — | Reference |
| N05 | P, LOCK CONTROL, FUEL FILLER CAP this code has more than one documented meaning — filter by year | 1991 | GM sourced |
| N06 | Steering column lock, electrical | 2026 | GM sourced |
| N08 | Locking fuel door this code has more than one documented meaning — filter by year | 2026 | GM sourced |
| N09 | P, LOCK CONTROL, FUEL FILLER DR, MANUAL | 1994 | GM sourced |
| N10 | Exhaust, dual system this code has more than one documented meaning — filter by year | 2026 | GM sourced |
| N11 | P, TAILPIPE, EXTENSION, SINGLE | 1999 | GM sourced |
| N12 | P, EXH, R EXHAUST SYSTEM, REAR EXIT this code has more than one documented meaning — filter by year | 1994 | GM sourced |
| N13 | P, TAILPIPE, EXTENSION, DUAL | 1999 | Provisional |
| N14 | P, FLEXIBLE FUEL, METHANOL | 1991 | GM sourced |
| N15 | P, FLEXIBLE FUEL, ETHANOL | 1991 | GM sourced |
| N16 | P, TAILPIPE, EXTENSION, 4 PIPE, 20820 E, 1 | — | GM sourced |
| N17 | P, LOCK CONTROL, FUEL FILLER CAP - DELETE | 1998 | GM sourced |
| N18 | P, PROTECTOR, BODY, INNER PANEL CARGO DAMAGE, RR COMPT | 1999 | GM sourced |
| N19 | P, TAILPIPE, EXTENSION, DUAL, CHROME, 512 E, 5 | — | GM sourced |
| N1B | P, EXH, R EXHAUST SYSTEM, SIDE EXIT this code has more than one documented meaning — filter by year | 1986 | GM sourced |
| N20 | Fuel Tank,50 Gallon | — | Reference |
| N21 | C, TNK, M FUEL TANK, 60 GAL 227L, LOW PROFILE, RH, 20507 | — | GM sourced |
| N22 | P, TNK, M FUEL TANK, 17 GAL RH, 35 GAL LH, RECT STEEL, STEP, 20917 | — | GM sourced |
| N23 | P, TNK, M FUEL TANK, 151L, 40 GAL, 607 | — | GM sourced |
| N24 | Steering Wheel Plastic, 3 Spokes this code has more than one documented meaning — filter by year | — | Reference |
| N25 | P, EXHAUST, EXTENSION this code has more than one documented meaning — filter by year | 1983 | GM sourced |
| N26 | P, WHL, M WHEEL, 16 X 7, ALUMINUM, CHROME, 7 SPOKE this code has more than one documented meaning — filter by year | 1998 | Provisional |
| N27 | P, SWL, M STEERING WHEEL, 2 SPOKES, STD this code has more than one documented meaning — filter by year | 1984 | GM sourced |
| N28 | P, WHL, M WHEEL, 14 X 5.5, ALUMINUM, SPECIAL | 1998 | GM sourced |
| N29 | P, WHL, M WHEEL, 15 X 6, ALUMINUM, SPECIAL | 1998 | GM sourced |
| N2H | Tire All P195/65r15 SL 89s BW Als | — | Reference |
| N2L | Fuel tank, rear only, 40 gallon | 2026 | GM sourced |
| N2M | Fuel Tank Front Tank 23.5 Gal (89l) | — | Reference |
| N2N | Fuel tank, front and rear, 63.5 gallon | 2026 | GM sourced |
| N30 | P, SWL, M STEERING WHEEL, DELUXE this code has more than one documented meaning — filter by year | 1983 | GM sourced |
| N31 | P, SWL, M STEERING WHEEL, HEATED | 1998 | GM sourced |
| N32 | P, SWL, M STEERING WHEEL, 2 SPOKES, DELUXE this code has more than one documented meaning — filter by year | 1983 | GM sourced |
| N33 | Steering column, Tilt-Wheel | 2026 | GM sourced |
| N34 | P, SWL, M STEERING WHEEL, LEATHER, 3 SPOKES this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| N35 | P, SWL, M STEERING WHEEL, LEATHER, 3 SPOKES, SPORT | 1998 | GM sourced |
| N36 | P, SWL, M STEERING WHEEL, 4 SPOKES, SPORT this code has more than one documented meaning — filter by year | 1983 | GM sourced |
| N37 | Steering column, manual tilt and telescoping | 2026 | GM sourced |
| N38 | Steering column, power tilt and telescopic | 2026 | GM sourced |
| N39 | P, SCL, R STEERING COLUMN, STANDARD | 1998 | Provisional |
| N3E | P, PROVISIONS, SPARE WHEEL ADDITIONAL MOUNTING | 1998 | GM sourced |
| N3F | P, COVER, SPARE WHEEL - TWO TONE, 1017 | — | Provisional |
| N3G | P, COVER, SPARE WHEEL, HARD PLASTIC, 10202 | — | Provisional |
| N3H | P, COVER, SPARE WHEEL, HARD WITH DECAL, 10216 | — | Provisional |
| N3L | Wheel 21 X 8.5, J, FRT & 21 X 9.5, J, Rr, Aluminum, Design 2 | — | Reference |
| N3R | Steering Wheel Urethane | — | Reference |
| N40 | P, SRS, R, STEERING, POWER, NON-VARIABLE RATIO | 1983 | GM sourced |
| N41 | P, SRS, R, STEERING, POWER, VARIABLE RATIO this code has more than one documented meaning — filter by year | 1983 | GM sourced |
| N42 | P, SRS, R, STEERING, POWER, VARIABLE EFFORT, ELECTRIC HYDRAULIC | 1996 | Provisional |
| N43 | P, SWL, M, STEERING WHEEL, 4 SPOKES, DELUXE, 1017 E, 5 | — | Provisional |
| N44 | P, SWL, M, STEERING WHEEL, 4 SPOKES, STD | 1999 | GM sourced |
| N45 | P, SWL, M, STEERING WHEEL, 3 SPOKES this code has more than one documented meaning — filter by year | 1983 | GM sourced |
| N46 | P, SWL, M, STEERING WHEEL, 4 SPOKES this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| N47 | P, SWL, M, STEERING WHEEL, LEATHER WRAPPED WITH VOICE RECOGNITION, 20515 E, 4 | — | Provisional |
| N48 | Steering Column Tilt Type, Power | — | Reference |
| N49 | Steering Wheel,sporty(cap Only) | — | Reference |
| N50 | Steering wheel, wrapped with mounted audio and cruise controls | 2026 | GM sourced |
| N51 | P, SRS, R, STEERING, MANUAL this code has more than one documented meaning — filter by year | 1983 | GM sourced |
| N52 | P, SWL, M, STEERING WHEEL, 3 SPOKES, DELUXE, 20820 E, 0 | — | GM sourced |
| N53 | Steering wheel, 3-spoke | 2026 | GM sourced |
| N54 | P, SWL, M, STEERING WHEEL, 3 SPOKES, SPORT this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| N55 | P, SWL, M, STEERING WHEEL, LEATHER, 3 SPOKES, SPORT, ERGONOMIC, 906 E, 0 this code has more than one documented meaning — filter by year | — | GM sourced |
| N56 | P, WHL, M, WHEEL, 17 X 7.5, ALUMINUM, CUSTOM, 20710 E, 0 | — | GM sourced |
| N57 | Steering wheel, wrapped | 2026 | GM sourced |
| N58 | Wheel,steering,4-spoke,w/airbag | — | Reference |
| N5D | Liner Intr, Storage Compts | — | Reference |
| N5G | Steering wheel, wrapped this code has more than one documented meaning — filter by year | 2026 | GM sourced |
| N5L | Steering wheel, leather-wrapped | 2026 | GM sourced |
| N5M | Steering wheel, leather-wrapped | 2026 | GM sourced |
| N5V | Steering wheel, vinyl | 2026 | GM sourced |
| N5X | Steering wheel, leather-wrapped | 2026 | GM sourced |
| N60 | P, WHL, M, WHEEL, ALUMINUM, PAINTED this code has more than one documented meaning — filter by year | 1983 | GM sourced |
| N61 | P, WHL, M, WHEEL, 20 X 7.0, 8 HOLE | 1987 | Provisional |
| N62 | P, WHL, M, WHEEL, 13 X 5, STEEL, PAINTED | 1996 | GM sourced |
| N63 | P, WHL, M, WHEEL, 16 X 6, STEEL, STYLED | 1996 | GM sourced |
| N64 | P, TAW, M, TIRE & WHEEL, SPARE, SPACE SAVER, ALUMINUM | 1998 | GM sourced |
| N65 | P, TAW, M, TIRE & WHEEL, SPARE, SPACE SAVER, STEEL this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| N66 | P, WHL, M, WHEEL, ALUMINUM, STYLED this code has more than one documented meaning — filter by year | 1996 | GM sourced |
| N67 | P, WHL, M, WHEEL, 14 X 5.5, STEEL, PAINTED this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| N68 | P, WHL, M, WHEEL, 14 X 5.5, ALUMINUM, CUSTOM | 1999 | GM sourced |
| N69 | P, WHL, M, WHEEL, 13 X 5, 12 ROUND HOLES | 1992 | GM sourced |
| N70 | P, WHL, M, WHEEL, 13 X 5.5 this code has more than one documented meaning — filter by year | 1983 | GM sourced |
| N71 | P, WHL, M, WHEEL, 13 X 5, STEEL, 15 HOLES | 1995 | Provisional |
| N72 | P, WHL, M, WHEEL, 13 X 5, ALUMINUM, 5 SPOKES, ROUND | 1996 | Provisional |
| N73 | P, WHL, M, WHEEL, CUSTOM SPORT, VAR 4 this code has more than one documented meaning — filter by year | 1984 | GM sourced |
| N74 | P, WHL, M, WHEEL, 17 X 7, ALUMINUM, SPORT this code has more than one documented meaning — filter by year | 1996 | GM sourced |
| N75 | P, WHL, M, WHEEL, 17 X 7, ALUMINUM, CUSTOM this code has more than one documented meaning — filter by year | 1996 | GM sourced |
| N76 | P, WHL, M, WHEEL, 13 X 5, 16 ROUND HOLES | 1984 | GM sourced |
| N77 | P, WHL, M, WHEEL, 17 X 7, ALUMINUM, DELUXE this code has more than one documented meaning — filter by year | 1996 | GM sourced |
| N78 | P, WHL, M, WHEEL, 14 X 6, ALUMINUM, HUB CAP, WHEEL NUTS this code has more than one documented meaning — filter by year | 1984 | GM sourced |
| N79 | P, WHS, R, WHEEL SPARE, FULL SIZE, STEEL this code has more than one documented meaning — filter by year | 1996 | GM sourced |
| N80 | P, WHL, M, WHEEL, 17 X 7, ALUMINUM, PREMIUM this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| N81 | P, SPT, R, TIRE SPARE, FULL SIZE this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| N82 | P, WHL, M, WHEEL, 17 X 8, ALUMINUM, PAINTED this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| N83 | P, WHL, M, WHEEL, 15 X 7, CHROME, STYLED this code has more than one documented meaning — filter by year | 1992 | GM sourced |
| N84 | P, TIRES, SPARE - DELETE this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| N85 | P, WHL, M, WHEEL, 17 X 6.5, ALUMINUM | 1999 | GM sourced |
| N86 | P, WHS, R, WHEEL SPARE, FULL SIZE, LOW MASS ALUMINUM this code has more than one documented meaning — filter by year | 1999 | 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.