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| 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 101–200 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 |
|---|---|---|---|
| M70 | 4L70-E heavy-duty four-speed automatic transmission | 2007 | GM sourced |
| M72 | P, TRN, M, TRANSMISSION, MAN 6 SPD, TBD, M72 | 1996 | GM sourced |
| M73 | P, TRN, M, TRANSMISSION, MAN 6 SPD, RENAULT, O/DRIVE this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| M74 | P, TRN, M, TRANSMISSION, AUTO 5 SPD, ALLISON, LCT 1000, 3.10 1ST, 1.00 4TH,.71 5TH, O/D, CONV CLUTCH this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| M75 | P, TRN, M, TRANSMISSION, CONTINUOUSLY VARIABLE RATIO, GM, VT25-E,, ELECTRONIC, 413 | — | GM sourced |
| M76 | P, TRN, M, TRANSMISSION, AUTO 4 SPD, HMD, 4T65-E PTU, O/D this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| M77 | P, TRN, M, TRANSMISSION, MAN 5 SPD, RENAULT, O/D this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| M78 | P, TRN, M, TRANSMISSION, MAN 5 SPD this code has more than one documented meaning — filter by year | 1984 | GM sourced |
| M79 | P, TRN, M, TRANSMISSION, MAN 5 SPD, ISUZU, 72MM, 3.41 1ST, 1.95 2ND, .70 5TH this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| M7A | P, IDENTIFICATION, BODY SHOP PROCESS #1, 623 | — | Provisional |
| M7B | P, IDENTIFICATION, BODY SHOP PROCESS #2, 623 | — | Provisional |
| M7C | P, IDENTIFICATION, BODY SHOP PROCESS #3, 623 | — | Provisional |
| M7D | P, IDENTIFICATION, BODY SHOP PROCESS #4, 623 | — | Provisional |
| M7E | P, IDENTIFICATION, BODY SHOP PROCESS #5, 623 | — | Provisional |
| M7F | P, IDENTIFICATION, BODY SHOP PROCESS #6, 623 | — | Provisional |
| M7G | P, IDENTIFICATION, BODY SHOP PROCESS #7, 623 | — | Provisional |
| M7H | P, IDENTIFICATION, BODY SHOP PROCESS #8, 623 | — | Provisional |
| M7J | P, IDENTIFICATION, BODY SHOP PROCESS #9, 623 | — | Provisional |
| M7K | P, IDENTIFICATION, SERVICE BODY SHELL, 20130 | — | Provisional |
| M7Q | Transmission Man 5 Spd, 65 Mm, 3.727 1st, 2.136 2nd, 1.323 3rd 0, 892 4th , 0.674 5th, (f17 Er) | — | Reference |
| M7U | Transmission Auto 6 Spd, 6t70, Awd, Gen 2 | — | Reference |
| M7V | Transmission Auto 6 Spd, 6t75, Fwd, Gen 2 | — | Reference |
| M7W | Transmission Auto 6 Spd, 6t70, Fwd, Gen 2 | — | Reference |
| M7X | Transmission Auto 6 Spd, 6t75, Awd, Gen 2 | — | Reference |
| M7Y | Transmission Man 6 Spd, Opel, 76.5 Mm, 3.81 1st, 2.35 2nd, 1.47 3rd, 1.06 4th, 0.87 5th, 0.74 6th, M32- | — | Reference |
| M7Z | Transmission Man 5 Spd, 72mm, Fwd | — | Reference |
| M80 | P, TRN, M, TRANSMISSION, AUTO/MAN 6 SPEED, OPEL, M20, 0.74 6TH, ELECTRONIC,(WR), (TIPTRONIC), 20416 E, 0 | — | Provisional |
| M81 | Transmission,5-spd Manual | — | Reference |
| M82 | P, TRN, M, TRANSMISSION, AUTO 5 SPD, HMD, 5L40-E, ELECTRONIC this code has more than one documented meaning — filter by year | 1995 | GM sourced |
| M83 | P, TRN, M, TRANSMISSION, CONTINUOUSLY VARIABLE RATIO, GM, VT20-E,, ELECTRONIC this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| M84 | P, TRN, M, TRANSMISSION, AUTO/MAN 6 SPEED, GETRAG, 3.42 1ST, 0.634 6TH, HYBRID, 21022 | — | Provisional |
| M85 | P, TRN, M, TRANSMISSION, MAN 5 SPD, SAAB, 76.5 MM, F26, 5T45MS | 1998 | GM sourced |
| M86 | P, TRN, M, TRANSMISSION, MAN 5 SPD, GETRAG, 5T45E, M, F23, 75MM, 3.58 1ST 2.02 2ND, 1.35 3RD, 0.98 4TH, 0.69 5TH, 10912 | — | GM sourced |
| M87 | P, TRN, M, TRANSMISSION, MAN 5 SPD, TREMEC, 77MM, 4.03 1ST, .72 5TH, O/D, 10823 | — | Provisional |
| M88 | P, TRN, M, TRANSMISSION, MAN 5 SPD, TREMEC, 77MM, 4.03 1ST, .86 5TH, O/D, 10823 | — | GM sourced |
| M89 | P, TRN, M, TRANSMISSION, AUTO 5 SPD, HMD, 5L90-E, ELECTRONIC | 1995 | GM sourced |
| M8A | P, OWM, R, OWNERS MANUAL, FRENCH - RENAULT, 524 | — | Provisional |
| M8B | P, OWM, R, OWNERS MANUAL, ENGLISH- RENAULT, 524 | — | Provisional |
| M8C | P, OWM, R, OWNERS MANUAL, GERMAN- RENAULT, 524 | — | Provisional |
| M8D | P, OWM, R, OWNERS MANUAL, BELGIAN - RENAULT, 524 | — | Provisional |
| M8E | P, OWM, R, OWNERS MANUAL, SWISS - RENAULT, 524 | — | Provisional |
| M8F | P, OWM, R, OWNERS MANUAL, SPANISH - RENAULT, 524 | — | Provisional |
| M8G | P, OWM, R, OWNERS MANUAL, ITALIAN - RENAULT, 524 | — | Provisional |
| M8H | P, OWM, R, OWNERS MANUAL, DUTCH - RENAULT, 524 | — | Provisional |
| M8J | P, OWM, R, OWNERS MANUAL, PORTUGESE - RENAULT, 524 | — | Provisional |
| M8K | P, OWM, R, OWNERS MANUAL, POLISH - RENAULT, 524 | — | Provisional |
| M8L | P, OWM, R, OWNERS MANUAL, CZECH - RENAULT, 524 | — | Provisional |
| M8M | P, OWM, R, OWNERS MANUAL, TURKISH - RENAULT, 524 | — | Provisional |
| M90 | P, TRN, M, TRANSMISSION, AUTO 4 SPD, HMD, 4L40-E, ELECTRONIC this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| M91 | P, TRN, M, TRANSMISSION, AUTO 4 SPD, AISIN-WARNER, A4-AF13, ELECTRONIC | 1995 | GM sourced |
| M92 | P, TRN, M, TRANSMISSION, AUTO 4 SPD, AISIN-WARNER, A4-AF20, ELECTRONIC this code has more than one documented meaning — filter by year | 1995 | GM sourced |
| M93 | P, TRN, M, TRANSMISSION, AUTO 4 SPD, AISIN-WARNER, A4-AF22, ELECTRONIC this code has more than one documented meaning — filter by year | 1995 | GM sourced |
| M94 | P, TRN, M, TRANSMISSION, MAN 5 SPD, OPEL, F23, M HD 5T45MI, 0.98 4TH,, 0.68 5TH, 10912 | — | GM sourced |
| M95 | P, TRN, M, TRANSMISSION, AUTO 5 SPD, HMD, 5T70-E, ELECTRONIC | 1996 | GM sourced |
| M96 | P, TRN, M, TRANSMISSION, MAN 5 SPD, TREMEC, 109MM, 5.81 1ST, 0.77 5TH this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| M97 | P, SHIFTER INTERLOCK, BRAKE, TRANS | 1994 | GM sourced |
| M98 | P, TRN, M, TRANSMISSION, AUTO 5 SPD, AISIN-WARNER, A5-F33, ELECTRONIC CONTROLS this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| M99 | 2ML70 transmission used with the two-mode hybrid system | 2008–2013 | GM sourced |
| M9A | P, OWM, R, OWNERS MANUAL, NOT REQUIRED | 1999 | GM sourced |
| M9J | P, OWM, R, OWNERS MANUAL, MULTI LANGUAGE | 1999 | GM sourced |
| M9L | P, OWM, R, OWNERS MANUAL, ENGLISH - OPEL | 1999 | GM sourced |
| M9M | P, OWM, R, OWNERS MANUAL, ENGLISH - VAUXHALL | 1999 | GM sourced |
| M9N | P, OWM, R, OWNERS MANUAL, RUSSIAN | 1999 | GM sourced |
| M9P | P, LOCAL, IBC/VEC, 21014 | — | Provisional |
| M9V | P, MANUAL, MAINTENANCE - W/O WARRANTY MANUAL, 524 | — | Provisional |
| M9W | P, MANUAL, MAINTENANCE - WITH WARRANTY MANUAL, 524 | — | Provisional |
| M9X | Owners Manual Spanish Language (mexican) | — | Reference |
| MA1 | C, TRN, M, TRANSMISSION, AUTO 5 SPD, AISIN, AW-FA57, 10427 E, 3 | — | GM sourced |
| MA2 | P, CLU, R, CLUTCH, 14-1 ORGANIC, LUK, PULL TYPE | 1999 | Provisional |
| MA3 | P, CLU, R, CLUTCH, 14, 5-1 ORGANIC, LUK, PULL TYPE | 1999 | Provisional |
| MA4 | P, CLU, R, CLUTCH, 8.5 IN | 1998 | Provisional |
| MA5 | P, TRN, M TRANSMISSION, MAN 5 SPD, AISIN, 82 MM, 3.753 1ST, 0.729 5TH, 10827 | — | GM sourced |
| MA6 | P, TRN, M TRANSMISSION, MAN 5 SPD, CLARK CL1905, O/D | 1995 | Provisional |
| MA7 | P, TRN, M TRANSMISSION, MAN 6 SPD, OPEL, 76.5 MM, 3.82 1ST, 0.615 6TH, (M28 WR), HEAVY DUTY, 20124 E, 0 | — | Provisional |
| MA8 | C, LEVER, TRANS CONT, SPORT | 1998 | Provisional |
| MA9 | P, CLU, R CLUTCH, 12 IN, SINGLE PLATE, CERAMETALIX | 1998 | Provisional |
| MAA | Marketing Area Africa | — | Reference |
| MAB | Marketing Area Other China Group | — | Reference |
| MAC | Marketing Area Central & South America | — | Reference |
| MAD | Marketing Area-chile | — | Reference |
| MAE | P, MAX, R MARKETING AREA, EUROPE this code has more than one documented meaning — filter by year | 1993 | GM sourced |
| MAF | P, MAX, R MARKETING AREA, APO | 1998 | GM sourced |
| MAG | P, MAX, R MARKETING AREA, LAAMO | 1998 | GM sourced |
| MAH | Marketing Area North America | — | Reference |
| MAI | Marketing Area(export) | — | Reference |
| MAJ | Marketing Area Central America this code has more than one documented meaning — filter by year | — | Reference |
| MAK | Marketing Area - England(united Kingdom)(export) this code has more than one documented meaning — filter by year | — | Reference |
| MAM | Marketing Area Middle East | — | Reference |
| MAO | Marketing Area China Group | — | Reference |
| MAP | Marketing Area Other Asia Pacific | — | Reference |
| MAQ | Marketing Area-iraq | — | Reference |
| MAR | FAMILY CODE, MARKET BRAND, 10507 | — | Provisional |
| MAS | Marketing Area Japan this code has more than one documented meaning — filter by year | — | Reference |
| MAU | P, MAX, R MARKETING AREA, UNREGULATED this code has more than one documented meaning — filter by year | 1986 | GM sourced |
| MAW | Marketing Area Korea | — | Reference |
| MAX | Family Code, Marketing Area | 1988 | GM dated |
| MAY | Marketing Area Andean (south America 2) | — | Reference |
| MB1 | Transmission,manual 5-speed(borg-warner) | — | Reference |
| MB2 | P, PLUG, TRANSMISSION, MAGNETIC FILLER this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| MB3 | P, TRN, M TRANSMISSION, AUTO 3 SPD, TOYOTA, 2,810 1ST, 1.000 3RD | 1995 | 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.