← 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 501–600 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 |
|---|---|---|---|
| MT7 | P, TRN, M, TRANSMISSION, MAN 13 SPD, RTLO 16913, O/DRIVE, 202 E, 8 | — | Provisional |
| MT8 | P, TRN, M, TRANSMISSION, MAN 18 SPD, RTLO 16918, O/DRIVE, 202 E, 8 | — | GM sourced |
| MT9 | P, TRN, M, TRANSMISSION, AUTO, ALLISON, AT542 this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| MTA | P, PROVISIONS, BASIC TRUCK W/O SPLIT SHF&EXH BRK FEATURES, 20104 | — | GM sourced |
| MTC | Family Code, Merchandised Trans | 1988 | GM dated |
| MTD | P, CLU, R, CLUTCH, 14-1 CERAMETALIX, EATON-VALEO, PULL TYPE this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| MTE | Provisions Fire Extinguisher/safety Reflector Kit Mounting | — | Reference |
| MTF | P, PROVISIONS, FIRE EXTINGUISHER MOUNTING, 20408 E, 3 | — | GM sourced |
| MTG | P, PROVISIONS, EMERGENCY VEH W/SPLIT SHAFT PTO FEATURES, 20104 | — | GM sourced |
| MTH | P, TRN, M, TRANSMISSION, MAN 10 SPD, FULLER, RT7608LL, DIRECT DRIVE this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| MTI | C, PROVISIONS, BASIC TRUCK EMERGENCY VEHICLE APPLICATION | 1999 | GM sourced |
| MTJ | P, PROVISIONS, EMERGENCY VEH W/O SPLIT SHAFT PTO FEATURES, 20104 | — | GM sourced |
| MTK | P, PROVISIONS, REFUSE TRK, AUTO NEUTRAL this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| MTL | P, TRN, M, TRANSMISSION, MAN, 6 SPD, ZF S6-820, 135 MM, 9.06 1ST, 1.36 5TH,1.00 6TH, 8.27 RR | 1999 | Provisional |
| MTM | Provisions Windshield, Rearview Mirror this code has more than one documented meaning — filter by year | — | Reference |
| MTN | P, TRN, M, TRANSMISSION, MAN 6 SPD, AICHI-TOYOTA, 75MM, 3.17 1ST, 0.72 6TH, 10104 | — | GM sourced |
| MTO | C, CABLE, CLUTCH-FELSTED this code has more than one documented meaning — filter by year | 1993 | GM sourced |
| MTP | P, TRN, M, TRANSMISSION, AUTO 6 SPD, ALLISON, MD3560P, W/PTO DRIVE GEAR this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| MTQ | P, TRN, M, TRANSMISSION, MAN 5 SPD, ISUZU, 69.5 MM, 4.12 1ST, .855 5TH, O/D, 10807 | — | Provisional |
| MTR | Transmission Auto 6 Spd, Allison, 1000mh, Conv Clutch, With Park Pawl | — | Reference |
| MTS | Transmission Auto 6 Spd, Allison, 2200 Mh, Conv Clutch, With Park Pawl | — | Reference |
| MTU | P, TRN, M, TRANSMISSION, AUTO 6 SPD, ALLISON, MD3066, W/PTO DRIVE GEAR, 20408 | — | GM sourced |
| MTW | P, TRN, M, TRANSMISSION, AUTO 5 SPD, ALLISON, 2400 SERIES, CONV CLUTCH, W/PARK PAWL, O/D, 608 | — | GM sourced |
| MTX | P, TRN, M, TRANSMISSION, AUTO 5 SPD, ALLISON, 2200 SERIES, CONV CLUTCH, W/PARK PAWL, O/D, CLOSE RATIO, 10821 | — | GM sourced |
| MTY | Transmission Auto 5 Spd, Allison, 2300 Series, Conv Clutch W/o Park Pawl, OD | — | Reference |
| MU0 | P, TRN, M, TRANSMISSION, AUTO 4 SPD, JATCO RG | 1987 | Provisional |
| MU1 | P, TRN, M, TRANSMISSION, MAN 5 SPD, NVG, 76MM, 3.77 1ST, 1.03 4TH, .81 5TH this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| MU2 | P, TRN, M, TRANSMISSION, CONTINUOUSLY VARIABLE RATIO, GM, CVT3, ELECTRONIC | 1999 | GM sourced |
| MU3 | P, TRN, M, TRANSMISSION, MAN 5 SPD, SAAB, 76.5 MM, 3.38 1ST, 0.70 5TH this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| MU4 | P, TRN, M, TRANSMISSION, AUTO 4 SPD, AISIN-TOYOTA, 10104 | — | GM sourced |
| MU5 | P, TRN, M, TRANSMISSION, AUTO 4 SPD, AISIN-TOYOTA, PTU, 10104 | — | GM sourced |
| MU6 | P, TRN, M, TRANSMISSION, AUTO 4 SPD, HOKKAIDO-TOYOTA, 10104 | — | GM sourced |
| MU7 | P, TRN, M, TRANSMISSION, MAN 5 SPD, BRAZIL, 65MM, 4.273 1ST, 1.483 3RD, 0.804 5TH (F15/F17M HR), 106 E, 5 | — | Provisional |
| MU8 | P, TRN, M, TRANSMISSION, MAN 5 SPD, BRAZIL, 65MM, 4.273 1ST, 0.804 5TH AUTOMATIC CLUTCH SYSTEM (F15/F17M HR), 106 E, 5 | — | Provisional |
| MU9 | P, TRN, M, TRANSMISSION, MAN 6 SPD, OPEL, 83MM, 3.77 1ST, 0.70 6TH (F40 CR), 10131 E, 0 | — | GM sourced |
| MUK | P, SSS, M, SENSOR, PROVISIONS, ELECTRONIC, TRANS MOUNTED this code has more than one documented meaning — filter by year | 1994 | GM sourced |
| MUQ | P, CONTROL, SHIFT, AUTO TRANS, STRG COL MTD this code has more than one documented meaning — filter by year | 1991 | GM sourced |
| MUR | P, CONTROL, SHIFT, AUTO TRANS, DASH MTD this code has more than one documented meaning — filter by year | 1992 | GM sourced |
| MUS | P, CLU, R CLUTCH, 13-2 CERAMETALIX, PULL TYPE, LIPE this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| MUT | P, TRN, M TRANSMISSION, MAN 9 SPD, FULLER, RT6609, DIRECT DRIVE this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| MUU | P, TRN, M TRANSMISSION, MAN 7 SPD, FULLER, T14607B, DIRECT DRIVE, 10131 | — | GM sourced |
| MUV | Transmission,manual 10 Speed,fuller Rto6610,o/drive this code has more than one documented meaning — filter by year | — | Reference |
| MUW | P, CONTROL, SHIFT, FELSTED, W/PARK POSITION this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| MUX | C, MODIFICATION, TRANS LOCKUP this code has more than one documented meaning — filter by year | 1991 | GM sourced |
| MUY | P, PROVISIONS, SEWER CLEANING VEH W/SPLIT PTO FEATURES, 20104 | — | GM sourced |
| MUZ | C, FILTER TRANSMISSION, OIL this code has more than one documented meaning — filter by year | 1991 | GM sourced |
| MV1 | P, TRN, M TRANSMISSION, MAN 6 SPD, AISIN, 85MM, 4.17 1ST, 0.79 6TH, O/D, 20809 | — | GM sourced |
| MV2 | P, TRN, M TRANSMISSION, MAN 6 SPD, F19, 3.91 1ST, 1113 E, 0 | — | GM sourced |
| MV3 | P, TRN, M TRANSMISSION, AUTO 5 SPD, HMD, 5L50-E PTU , ELECTRONIC, O/D this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| MV4 | P, TRN, M TRANSMISSION, AUTO/MAN 5 SPEED, OPEL, F13, 0.76 5TH, ELECTRONIC,(WR), (TIPTRONIC), 10629 E, 0 | — | GM sourced |
| MV5 | P, TRN, M TRANSMISSION, MAN 6 SPD, AISIN, 85MM, 4.42 1ST, 0.75 6TH, O/D, 20603 E, 8 this code has more than one documented meaning — filter by year | — | GM sourced |
| MV6 | P, TRN, M TRANSMISSION, AUTO 4 SPD, AISHIN-AW, SS, 11205 E, 8 | — | Provisional |
| MV7 | P, TRN, M TRANSMISSION, MAN 5 SPD, ISUZU, 77.5 MM, 3.767 1ST, 0.809 5TH this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| MV8 | P, TRN, M TRANSMISSION, MAN 6 SPD, (F28), SAAB, 20307 | — | GM sourced |
| MV9 | Transmission,automatic 3-speed(thm200c) | — | Reference |
| MVA | Transmission Auto 4 Spd, Toyota, Ptu, 1st 3.938, 4th 1.019 | — | Reference |
| MVB | Transmission Auto 4 Spd, Toyota, 1st 2.847, 4th 0.700 | — | Reference |
| MVC | Transmission Man 5 Spd, Toyota, 3.538 1st, 0.731 5th | — | Reference |
| MVD | Transmission Auto 5 Spd, Toyota, 3.943 1st, 0.703 5th. | — | Reference |
| MVE | Transmission Man 5 Spd, Toyota, 3.166 1st, 0.725 5th. | — | Reference |
| MVO | P, PROCESSING, MILITARY VEHICLE ORDERS this code has more than one documented meaning — filter by year | 1996 | GM sourced |
| MW0 | P, TRN, M TRANSMISSION, MAN 6 SPD, EATON, 9.01 1ST, 605 LBS. CAP., DIRECT DRIVE this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| MW1 | P, TRN, M TRANSMISSION, MAN 5 SPD, BORG WARNER, 77MM, 4.03 1ST, .86 5TH, O/D this code has more than one documented meaning — filter by year | 1988 | GM sourced |
| MW2 | P, TRN, M TRANSMISSION, MAN 5 SPD, NVG, 76MM, 3.96 1ST, .83 5TH, O/D this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| MW3 | P, TRN, M TRANSMISSION, MAN 5 SPD, NVG, 109MM, 5.61 1ST, O/D this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| MW4 | P, TRN, M TRANSMISSION, AUTO 5 SPD, HMD, X20, PTU this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| MW5 | Transmission,man 6 Spd,fuller,fs7206,d/drive | — | Reference |
| MW6 | P, TRN, M TRANSMISSION, AUTO 5 SPD, HMD, X20F | 1999 | GM sourced |
| MW7 | Allison 1000 six-speed automatic transmission | 2007 | GM sourced |
| MW8 | P, TRN, M TRANSMISSION, MAN 5 SPD, ISUZU, 77.5MM, 4.01 1ST, 0.83 5TH, O/D this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| MW9 | P, TRN, M TRANSMISSION, MAN 5 SPD, ISUZU, 77.5MM, 4.357 1ST, 0.809 5TH, O/D | 1998 | GM sourced |
| MWE | P, CLP, R PILOT SHAFT, AUTO TRANS, NO SPLINE this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| MWF | P, CLP, R PILOT SHAFT, AUTO ELECT TRANS, NO SPLINE this code has more than one documented meaning — filter by year | 1989 | GM sourced |
| MWJ | Transmission Man 6 Spd, (f40, Awd), 1st 4.167, 6th 0.740 Shaft 197mm | — | Reference |
| MWK | P, TRN, M TRANSMISSION, MAN 9 SPD, FULLER, RT8609, DIRECT DRIVE this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| MWL | Transmission Man 6 Spd, (f40) 1st 3.5, Sixth 0.707, Shaft 197mm | — | Reference |
| MWM | P, CLU, R CLUTCH, 14-1 CERAMETALIX, PULL TYPE, SPICER GREASABLE BEARING this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| MWN | Tailpipe Dual, Integrated IN Fascia | — | Reference |
| MWP | Transmission Auto 5 Spd, Allison, Lct 2500, 3.51 1st, 1.00 4th .74 5th, O/d, Conv Clutch | — | Reference |
| MWT | Transmission Auto 5 Spd, Allison 3000rds, W/pto Drive Gear | — | Reference |
| MWU | Transmission Auto 6 Spd, Allison 3000rds, W/pto Drive Gear | — | Reference |
| MWV | P, CLP, R PILOT SHAFT, TRANS 1.125 IN SPLINE this code has more than one documented meaning — filter by year | 1995 | GM sourced |
| MWW | P, CLP, R PILOT SHAFT, TRANS 1.75 IN SPLINE this code has more than one documented meaning — filter by year | 1996 | GM sourced |
| MWX | P, CLP, R PILOT SHAFT, TRANS 1.5 IN SPLINE this code has more than one documented meaning — filter by year | 1996 | GM sourced |
| MWY | Transmission Auto 5 Spd,allison 3500rds,w/pto Drive Gear | — | Reference |
| MWZ | Transmission Auto 6 Spd, Allison 3500rds, W/pto Drive Gear | — | Reference |
| MX0 | P, MTC, M MERCHANDISED TRANS, AUTO PROVISIONS, O/D | 1991 | GM sourced |
| MX1 | three-speed automatic transmission | 1990 | GM sourced |
| MX2 | P, TRN, M TRANSMISSION, AUTO 4 SPD, ALLISON, LCT 1000, 3.10 1ST, 1.00 4TH,CONV CLUTCH this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| MX3 | P, TRN, M TRANSMISSION, AUTO 4 SPD, ALLISON, LCT 2000, 3.51 1ST, 1.00 4TH,CONV CLUTCH this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| MX4 | P, TRN, M TRANSMISSION, AUTO 5 SPD, ALLISON, 2000 SERIES, CONV CLUTCH, O/D, 608 | — | GM sourced |
| MX5 | P, TRN, M TRANSMISSION, AUTO 5 SPD, HMD, 5L40-E PTU, O/D this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| MX6 | P, MTC, M MERCHANDISED TRANS, AUTO PROVISIONS,, CONTINUOUSLY VARIABLE RATIO | 1999 | GM sourced |
| MX7 | P, MTC, M MERCHANDISED TRANS, AUTO PROVISIONS, O/D, AWD (ALL WHEEL DRIVE), 10131 E, 4 | — | GM sourced |
| MX8 | P, TRN, M TRANSMISSION, AUTO 6 SPD, HMD, X8R (400 LB. FT), 208 E, 8 | — | Provisional |
| MX9 | P, TRN, M TRANSMISSION, AUTO 6 SPD, HMD, X9R (500 LB. FT), 210 | — | Provisional |
| MXD | P, PROVISIONS, LUBRICATION, CLUTCH this code has more than one documented meaning — filter by year | 1991 | GM sourced |
| MXE | Transmission Auto 6 Spd, Aisin, Af-40-6 Awd | — | Reference |
| MXF | Transmission Man 5 Spd, Gmdat, D16, C/r, 72mm, 3.545 1st | — | Reference |
| MXG | Transmission Man 5 Spd, Y4a, Gmdat, 60mm, 3.818 1st, 0.837 | — | 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.