← 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 301–400 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 |
|---|---|---|---|
| NQC | P, TNK, M FUEL TANK, 132L, 35 GAL, 11 X 24, DUAL RECT, INT STEP this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| NQE | P, TNK, M FUEL TANK, 76L, 20 GAL, SINGLE this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| NQF | Transfer case, two-speed, electronic shift with push button controls | 2026 | GM sourced |
| NQG | Transfer case, with floor-mounted shifter | 2019 | Reference |
| NQH | two-speed electronic transfer case | 2026 | GM sourced |
| NQJ | P, PROVISIONS, AUXILIARY ENGINE FUEL SUPPLY | 1997 | GM sourced |
| NQK | P, PROVISIONS, TEMPORARY ENGINE FUEL SUPPLY this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| NQL | Emission System Korean, Lev | — | Reference |
| NQM | Emission System Korean, Tlev | — | Reference |
| NQN | Emission System Korean 2000 | — | Reference |
| NQP | Emission System Korean 90 | — | Reference |
| NQQ | Emission System, Korean 98 | — | Reference |
| NQR | Emission System Ece83, Unleaded (gmdat) | — | Reference |
| NQS | Emission System Us83, Unleaded (gmdat) | — | Reference |
| NQT | Emission System Open Loop, Leaded (gmdat) | — | Reference |
| NQU | Emission System Korean, Ulev | — | Reference |
| NQV | Transfer Case 2 Speed,electric Shift,part Time 4wd,aam LH Drop,lo Rati | — | Reference |
| NQY | P, TNK, M FUEL TANK, AUXILIARY, RR MOUNTED, 20 GAL | 1998 | GM sourced |
| NQZ | P, TNK, M FUEL TANK, AUXILIARY, RR MOUNTED, 18 GAL - DELETE this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| NR0 | P, SWL, M STEERING WHEEL, LEATHER, 4 SPOKES | 1999 | GM sourced |
| NR1 | P, SRS, R, STEERING, POWER, NON-VARIABLE RATIO, ELECTRIC HYDRAULIC, REDUCED RACK TRAVEL, 407 E, 0 | — | GM sourced |
| NR2 | P, SRS, R, STEERING, POWER, REDUCED EFFORT, ELECTRIC HYDRAULIC, 407 E, 0 | — | GM sourced |
| NR3 | P, TCD, R, TRANSFER CASE, ALL WHEEL DRIVE (AWD), OPEN DIFF, SINGLE SPEED, 411 | — | GM sourced |
| NR4 | P, TCD, R, TRANSFER CASE, FOUR WHEEL DRIVE (4WD), OPEN DIFF, TWO SPEED, 20313 | — | GM sourced |
| NR5 | P, SWL, M, STEERING WHEEL, LEATHER, 4 SPOKES, DELUXE, 1017 E, 5 | — | GM sourced |
| NR6 | P, TCD, R, TRANSFER CASE, FOUR WHEEL DRIVE (4WD), OPEN DIFF, TWO SPEED, HIGH RATIO, 20313 | — | GM sourced |
| NR7 | P, SWL, M, STEERING WHEEL, LEATHER WRAPPED, HEATED, 20501 E, 4 | — | GM sourced |
| NR9 | Transfer Case All Wheel Drive (awd), Open Diff, Torque Biased Single Speed | — | Reference |
| NRE | P, EXHAUST, CATALYTIC CONVERTER, THRIFTING, 1004 | — | GM sourced |
| NRK | P, EQP, R, EMISSION EQUIPMENT, NON-THRIFTED CONVERTER, 10110 | — | GM sourced |
| NRP | Emission Equipment California | — | Reference |
| NRQ | P, EXHAUST, CLOSE COUPLED this code has more than one documented meaning — filter by year | 1991 | GM sourced |
| NRR | P, TAILPIPE, EXTENDED LENGTH | 1994 | GM sourced |
| NRS | Orvr Requirement | — | Reference |
| NRV | P, EQP, R, EMISSION EQUIPMENT, GASOLINE ENGINE LESS CONVERTER, 1116 | — | Provisional |
| NRW | P, EMS, M, EMISSION SYSTEM, DIESEL ENGINE CFV | 1995 | GM sourced |
| NRX | P, EQP, R, EMISSION EQUIPMENT, DIESEL ENGINE W/CONVERTER this code has more than one documented meaning — filter by year | 1996 | GM sourced |
| NRZ | P, EQP, R, EMISSION EQUIPMENT, DIESEL ENGINE LESS CONVERTER this code has more than one documented meaning — filter by year | 1996 | GM sourced |
| NS1 | Steering Power, Non-variable Ratio, Electric Hydraulic Reduced Rack TR | — | Reference |
| NS2 | Steering Power, Non-variable Ratio, Electric Hydraulic | — | Reference |
| NS6 | Steering Column Japan Approved | — | Reference |
| NSH | Steering Wheel Wood, Heated | — | Reference |
| NSS | Not Equipped with Automatic Stop/Start, see dealer for details | 2022 | Provisional |
| NT0 | P, EMS, M, EMISSION SYSTEM, EEC 00 (N1), 21104 | — | Provisional |
| NT1 | P, EMS, M, EMISSION SYSTEM, EEC 93 | 1998 | Provisional |
| NT2 | P, EMS, M, EMISSION SYSTEM, EEC 96 | 1998 | GM sourced |
| NT3 | P, EMS, M, EMISSION SYSTEM, EEC 00 | 1998 | GM sourced |
| NT4 | P, EMS, M, EMISSION SYSTEM, EEC 05 | 1998 | GM sourced |
| NT5 | P, EMS, M, EMISSION SYSTEM, EEC 96, D3 (GERMANY) | 1998 | Provisional |
| NT6 | P, EMS, M, EMISSION SYSTEM, D4 (GERMANY) | 1998 | Provisional |
| NT7 | P, EMS, M, EMISSION SYSTEM, FEDERAL, TIER 2, 211 | — | GM sourced |
| NT8 | P, EMS, M, EMISSION SYSTEM, FEDERAL, TIER 2 A, 211 | — | GM sourced |
| NT9 | P, EMS, M, EMISSION SYSTEM, FEDERAL, TIER 2 PHASE-OUT, 211 | — | GM sourced |
| NTS | Exhaust System,diesel(no Flex Pipe) | — | Reference |
| NU1 | P, EMS, M, EMISSION SYSTEM, CALIFORNIA, LEV2 this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| NU2 | P, EMS, M, EMISSION SYSTEM, CALIFORNIA, ULEV2 this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| NU3 | P, EMS, M, EMISSION SYSTEM, CALIFORNIA, SULEV this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| NU4 | P, EMS, M, EMISSION SYSTEM, CALIFORNIA LEV2 PLUS, 20212 | — | GM sourced |
| NU5 | Emission System California, Bin 4 | — | Reference |
| NU6 | Emission System California, Pzev | — | Reference |
| NU7 | Emission System Euro 5+ | — | Reference |
| NUA | Emission System California, 150k Lev 2 | — | Reference |
| NV1 | P, SHIELD, IMPACT, FRT SUSPENSION, OIL PAN | 1994 | Provisional |
| NV2 | P, WHL, M, WHEEL, 16 X 6, ALUMINUM, SPECIAL | 1998 | GM sourced |
| NV3 | P, WHL, M, WHEEL, 16 X 6, ALUMINUM, CUSTOM | 1998 | GM sourced |
| NV4 | P, SRS, R, STEERING, POWER, NON-VARIABLE RATIO, ELECTRIC HYDRAULIC | 1998 | Provisional |
| NV5 | P, SHIELD, DIFFERENTIAL CARRIER this code has more than one documented meaning — filter by year | 1983 | GM sourced |
| NV6 | P, SRS, R, STEERING, POWER, REDUCED EFFORT this code has more than one documented meaning — filter by year | 1983 | GM sourced |
| NV7 | P, SRS, R, STEERING, POWER, VARIABLE EFFORT this code has more than one documented meaning — filter by year | 1983 | GM sourced |
| NV8 | Steering, Digital Variable Steering Assist | 2026 | GM sourced |
| NV9 | P, SRS, R, STEERING, POWER, ELECTRIC | 1999 | GM sourced |
| NVH | Steering Power, Non-variable Effort, Hydraulic | — | Reference |
| NVM | P, PROVISIONS, 45 GAL LP GAS (PROPANE) TANK MOUNTING | 1998 | GM sourced |
| NVN | P, PROVISIONS, 75 GAL LP GAS (PROPANE) TANK MOUNTING | 1998 | GM sourced |
| NW0 | P, WHL, M, WHEEL, 16 X 6.5, ALUMINUM CAST | 1996 | GM sourced |
| NW1 | Wheel 18 X 7, Aluminum, Polished | — | Reference |
| NW2 | P, WHL, M, WHEEL, 18 X 7, ALUMINUM, SPORT, 10118 E, 0 | — | GM sourced |
| NW3 | P, WHL, M, WHEEL, 16 X 6, ALUMINUM, 6 SPOKES | 1998 | Provisional |
| NW4 | P, WHL, M, WHEEL, 13 X 5, STEEL, 12 TRAPEZOIDAL HOLES, HEAVY DUTY | 1998 | Provisional |
| NW5 | P, WHL, M, WHEEL, 18 X 7, ALUMINUM | 1999 | GM sourced |
| NW6 | P, WHL, M, WHEEL, 16 X 6, ALUMINUM, 10 SPOKES, 208 E, 0 | — | Provisional |
| NW7 | P, TCS, R, TRACTION CONTROL, POWERTRAIN MANAGEMENT ONLY | 1991 | GM sourced |
| NW8 | P, WHL, M, WHEEL, 13 X 5.5, 4 SPOKES | 1992 | GM sourced |
| NW9 | P, TCS, R, TRACTION CONTROL, ELECTRONIC this code has more than one documented meaning — filter by year | 1987 | GM sourced |
| NWA | C, FWS, R, SEPARATOR, FUEL/WATER, RACOR, MODEL 6401 | 1999 | GM sourced |
| NWB | P, FWS, R, SEPARATOR, FUEL/WATER - RACOR, SPIN ON this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| NWC | P, FWS, R, SEPARATOR, FUEL/WATER - HEATED, SECONDARY this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| NWD | C, EXHAUST, MODIFICATION, INCREASED GROUND CLEARANCE this code has more than one documented meaning — filter by year | 1989 | GM sourced |
| NWE | C, TNK, M, FUEL TANK, 132L, 35 GAL, RH, RECT, 25 X 15, INCLUDES STEP this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| NWF | P, FWS, R, SEPARATOR, FUEL/WATER-TOKYO ROKI, HEATED, 406 | — | Provisional |
| NWH | P, SHIELD, RR COMPARTMENT, FUSE BLOCK, THEFT DETERENT, 11128 E, 0 | — | Provisional |
| NWJ | P, EXHAUST, DUAL OUTLET EXHAUST | 1998 | Provisional |
| NWM | Advanced Security Package this code has more than one documented meaning — filter by year | 2026 | GM sourced |
| NWN | Tailpipe Single, Turned Down, Hidden | — | Reference |
| NWO | Tailpipe Dual Exposed, W/bright Tips | — | Reference |
| NWR | P, CAB, REINFORCEMENTS-DUAL VERT EXHAUST this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| NWS | C, TNK, M, FUEL TANK, COMBINATION, 60 GAL RH, 35 GAL LH, INT STEP | 1998 | GM sourced |
| NWT | Tailpipe Dual, Turned Down. Hidden | — | Reference |
| NWU | Tailpipe Downward Deflecting | — | Reference |
| NWY | Steering Power, Non-variable Ratio, Light Variable Effort Hydraulic, Reduced Rack Travel | — | 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.