← 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 201–300 of 633 codes beginning with M. One meaning shown per code — the best-sourced one we hold. Search above for the rest.
| Code | Meaning | Years | Sourcing |
|---|---|---|---|
| MB4 | P, TRN, M TRANSMISSION, MAN 5 SPD, TOYOTA, 3.166 1ST, 0.815 5TH | 1995 | GM sourced |
| MB5 | Transmission Man 5 Spd, Toyota, 3.545 1st, 0.815 5th this code has more than one documented meaning — filter by year | — | Reference |
| MB6 | Transmission,auto 6 Spd,allison,3500 Evs. | — | Reference |
| MB7 | Transmission Auto 5 Spd, Allison, Lct 1000 Pts. | — | Reference |
| MB8 | Transmission Auto 5 Spd, Allison, Lct 2200 Pts. | — | Reference |
| MB9 | P, CLU, R CLUTCH, 14 IN, GREASEABLE BEARING, CERAMETALIX | 1998 | GM sourced |
| MBA | Marketing Area Mercosul (south America 1) | — | Reference |
| MBB | Marketing Area Australia/nz | — | Reference |
| MBC | Marketing Area Canada | — | Reference |
| MBD | Marketing Area Central America/caribbean | — | Reference |
| MBF | Marketing Area India | — | Reference |
| MBH | Marketing Area Other SE Asia | — | Reference |
| MBI | Marketing Area Israel | — | Reference |
| MBJ | Marketing Area Asean (excluding Vietnam) | — | Reference |
| MBK | Marketing Area Thailand | — | Reference |
| MBL | Marketing Area Vietnam | — | Reference |
| MBM | Marketing Area Europe Group | — | Reference |
| MBN | Marketing Area Uzbekistan | — | Reference |
| MBP | Marketing Area Egypt | — | Reference |
| MBR | Marketing Area Russia Group | — | Reference |
| MBS | Marketing Area South Africa | — | Reference |
| MBT | P, LUBRICANT, FLUID-A/TRNS (TRANSYND), 20419 | — | GM sourced |
| MBV | Transmission Auto 6 Spd, Allison, 1000, Conv Clutch, With Park Pawl | — | Reference |
| MBW | Transmission Auto 6 Spd, Allison, 1000evs, Conv Clutch With Park Pawl | — | Reference |
| MBX | Transmission Auto 6 Spd, Allison, 1000pts, Conv Clutch With Park Pawl & Ptx | — | Reference |
| MBY | Transmission Auto 6 Spd, Allison, 2200pts, Conv Clutch With Park Pawl | — | Reference |
| MBZ | Transmission Auto 6 Spd, Allison, 2200, Conv Clutch With Park Pawl | — | Reference |
| MC0 | Transmission,manual 4-speed(getrag) | — | Reference |
| MC1 | P, TRN, M TRANSMISSION, AUTO 4 SPD, AISIN-WARNER, A4-F30, ELECTRONIC CONTROLS | 1997 | GM sourced |
| MC2 | P, TRN, M TRANSMISSION, MAN 5 SPD, SAAB, 76.5 MM, 3.38 1ST, 0.66 5TH | 1998 | GM sourced |
| MC4 | P, TRN, M TRANSMISSION, MAN 5 SPD, SAAB, 76.5 MM, 3.67 1ST, 0.70 5TH | 1998 | GM sourced |
| MC5 | Transmission,manual 5-speed | — | Reference |
| MC6 | P, TRN, M TRANSMISSION, MAN 5 SPD, SAAB, 76.5 MM, F35-5, 3.67 1ST, 0.66 5TH | 1998 | Provisional |
| MC7 | P, TRN, M TRANSMISSION, AUTO 4 SPD, AISIN-WARNER, A4-AF13, CONV CLUTCH | 1997 | Provisional |
| MC8 | P, TRN, M TRANSMISSION, AUTO/MAN 5 SPEED, OPEL, F13, 0.89 5TH, ELECTRONIC,(CR), (TIPTRONIC), 10508 E, 0 | — | Provisional |
| MC9 | Transmission,manual 4-speed(borg-warner) | — | Reference |
| MCA | Marketing Area Africa Group | — | Reference |
| MCB | Marketing Area Colombia | — | Reference |
| MCD | Marketing Area Ecuador | — | Reference |
| MCF | Marketing Area Venezuela | — | Reference |
| MCG | Marketing Area North Andean | — | Reference |
| MCH | Marketing Area South Andean | — | Reference |
| MCI | Family Code, Molding Color | 1988 | GM dated |
| MCJ | Marketing Area Northwest Andean | — | Reference |
| MCK | Marketing Area Southeast Andean | — | Reference |
| MCL | Marketing Area Argentina And Others | — | Reference |
| MCM | Marketing Area Brasil | — | Reference |
| MCN | Marketing Area South America 1, Other | — | Reference |
| MCO | Marketing Area Argentina/uruguay | — | Reference |
| MCR | USB Ports | 2022 | Provisional |
| MCV | Marketing Area Non-europe Group | — | Reference |
| MCX | Marketing Area Mexico | — | Reference |
| MCY | Port, Elek Device USB Only | — | Reference |
| MCZ | USB ports | 2022 | Provisional |
| MD0 | P, TRN, M TRANSMISSION, AUTO/MAN 5 SPEED, OPEL, F17, 0.76 5TH, ELECTRONIC,(WR), (TIPTRONIC), 10507 E, 0 | — | GM sourced |
| MD1 | P, TRN, M TRANSMISSION, AUTO ALLISON AT540 this code has more than one documented meaning — filter by year | 1983 | GM sourced |
| MD2 | P, TRN, M TRANSMISSION, AUTO 3 SPD, HMD, 3L30, STRASBOURG, CONV CLUTCH this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| MD3 | P, TRN, M TRANSMISSION, MAN 5 SPD, SAAB, 76.5 MM, 3.67 1ST, 0.77 5TH this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| MD4 | P, TRN, M TRANSMISSION, MAN 5 SPD, SAAB, 76.5MM, F25-5, 3.38 1ST, 0.77 5TH | 1998 | GM sourced |
| MD5 | P, TRN, M TRANSMISSION, MAN 5 SPD, BRAZIL, 65 MM, 4.18 1ST, 2.14 2ND, 0.895TH | 1998 | GM sourced |
| MD6 | P, TRN, M TRANSMISSION, AUTO 4 SPD, HMD, 4L65-E, ELECTRONIC, PTU, 11017 | — | GM sourced |
| MD7 | P, TRN, M TRANSMISSION, AUTO 4 SPD, HMD, 4T65-E, SHANGHAI, O/D this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| MD8 | Transmission Auto 4 Spd,hmd,4l70-e,super Duty(diesel Engine Usage) this code has more than one documented meaning — filter by year | — | Reference |
| MD9 | P, TRN, M TRANSMISSION, AUTO 3 SPD, HMD, 3T40, CLUTCH this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| MDB | Molding B/s Upper Black | — | Reference |
| MDC | Molding B/s Upper Bright | — | Reference |
| MDD | FAMILY CODE, MOLDING DOOR, 10830 | — | Provisional |
| MDE | Molding B/s Upper Bright, Window All Around | — | Reference |
| MDF | FAMILY CODE, MUD FLAPS, 11113 | — | Provisional |
| MDG | Transmission Man 5 Spd, 180mm, 3.909 1st, 0.892 5th, F17 | — | Reference |
| MDI | FAMILY CODE, MOLDING I/P, 10830 | — | Provisional |
| MDJ | Molding B/s Upper Satin Chrome, Window All Around | — | Reference |
| MDK | Transmission Auto 6 Spd, Aisin-warner, A6-af40, Electronic, Gen 2 | — | Reference |
| MDN | Molding B/s Upper Black Bright, Window All Around | — | Reference |
| MDP | Molding B/s Anthracite | — | Reference |
| MDR | FAMILY CODE, MOLDING ROOF, 10508 | — | Provisional |
| MDS | Molding B/s Upper Side Window, Bright Mat Chrome, Roof Line Black Belt | — | Reference |
| MDV | Marketing Area Brasil/paraguay | — | Reference |
| ME2 | C, TRN, M TRANSMISSION, AUTO 4 SPD, ALLISON, MD3060P this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| ME3 | P, TRN, M TRANSMISSION, AUTO, ALLISON, MT643D this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| ME4 | P, TRN, M TRANSMISSION, AUTO, ALLISON, MT643G this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| ME5 | P, TRN, M TRANSMISSION, AUTO, ALLISON, MT653DRD this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| ME6 | P, TRN, M TRANSMISSION, AUTO, ALLISON, MT653DRG this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| ME7 | Transmission Auto 4 Spd, Hmd, Gm, Bas/4t45 Mild Hybrid, Fwd | — | Reference |
| ME8 | P, TRN, M TRANSMISSION, MAN 5 SPD, EATON, FSO-2305A, 4.08 1ST, 0.725 5TH, O/D | 1997 | Provisional |
| ME9 | Transmission,automatic 4-speed(thm440-t4/4t60) | — | Reference |
| MEK | Transmission Man 7 Spd, Tremec (tr6070), 2.289 1st, 0.454 7th | — | Reference |
| MEL | Transmission Man 7 Spd, Tremec (tr6070), 2.966 1st, 0.478 7th | — | Reference |
| MEP | Transmission Man 7 Spd, Tremec (tr6070), 2.664 1st, 0.424 7th | — | Reference |
| MER | Transmission Man 6 Spd, Tremec (tr6060), 85mm, 3.01 1st, 0.71 5 Th, 0.57 6th, O/d | — | Reference |
| MET | FAMILY CODE, METER, 20523 | — | Provisional |
| MEX | P, PLT, R PLANT CODE, TOLUCA, MEXICO this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| MF1 | P, TRN, M TRANSMISSION, AUTO, ALLISON, AT545 this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| MF2 | P, TRN, M TRANSMISSION, MAN 5 SPD, EATON, FSO-4405A, 110 MM, 5.76 1ST, .775TH, O/D, 10216 E, 5 | — | GM sourced |
| MF3 | Transmission Man 6 Spd,opel, 76.5 Mm, 4.273 1st, 2.158 2nd, 1. 302 3rd | — | Reference |
| MF4 | TRANSFER CASE, NP205, 1.96 LO RANGE | — | Provisional |
| MF5 | P, TRN, M TRANSMISSION, MAN 9 SPD, EATON, FS8209, O/D | 1999 | Provisional |
| MF6 | Transmission, 10-speed automatic | 2019 | Reference |
| MF7 | P, TRN, M TRANSMISSION, MAN 5 SPD, ISUZU, 300MM, 4.99 1ST, .728 5TH, O/D | 1997 | Provisional |
| MF8 | Transmission Auto 5 Spd, Allison, 3000 Evs. | — | 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.