← 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 901–959 of 959 codes beginning with A. One meaning shown per code — the best-sourced one we hold. Search above for the rest.
| Code | Meaning | Years | Sourcing |
|---|---|---|---|
| AXX | Vehicle Type Vehicle Type - Not Required | — | Reference |
| AY0 | Airbags, Dual-stage frontal airbags for driver and front outboard passenger; Seat-mounted side | 2026 | GM sourced |
| AY1 | P, RES, M, RESTRAINT SYSTEM, SEAT, INFLATABLE, DRIVER & PASS, ROOF SIDE | 1998 | GM sourced |
| AY2 | P, RES, M, RESTRAINT SYSTEM, SEAT, INFLATABLE, DRIVER & PASS, FRT, FRT SIDE & ROOF & RR ROOF SIDE this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| AY3 | P, RSO, M, RESTRAINT (OPEL), HEAD, FRT SEAT, CLOTH COVERED | 1997 | Provisional |
| AY4 | P, RSO, M, RESTRAINT (OPEL), HEAD, FRT SEAT, LEATHER COVERED | 1997 | GM sourced |
| AY5 | P, RESTRAINT, HEAD, RR SEAT, CLOTH COVERED, CENTER | 1997 | GM sourced |
| AY6 | P, RESTRAINT, HEAD, RR SEAT, LEATHER COVERED, CENTER | 1997 | GM sourced |
| AY7 | P, RESTRAINT, HEAD, RR SEAT, VINYL COVERED, OPEN SECTION | 1997 | GM sourced |
| AY8 | P, RSO, M, RESTRAINT (OPEL), HEAD, RR SEAT, VINYL COVERED | 1998 | Provisional |
| AY9 | P, RESTRAINT, HEAD, RR SEAT, VINYL COVERED, CENTER | 1997 | GM sourced |
| AYC | Restraint System Seat, Inflatable, Driver & Pass Frt, Seat Side Roof Side, Single Stage | — | Reference |
| AYE | Restraint Head, RR Seat, Aniline Leather (with Dvd) | — | Reference |
| AYF | Restraint System Seat, Inflatable, Driver & Pass Frt, FRT Seat Side & RR Seat Side, Roof Side, Knee | — | Reference |
| AYG | Restraint System Seat, Inflatable, Driver & Pass FRT | — | Reference |
| AYH | Airbags | 2026 | GM sourced |
| AYK | Restraint Head RR ST L-shaped, 2 Way Adjust | — | Reference |
| AYN | Restraint Head, RR Seat, Nappa Leather Covered, Center | — | Reference |
| AYP | Window Power Operated, Rear Express Up/down | — | Reference |
| AYQ | Airbags, Frontal airbags for driver and front outboard passenger | 2020 | GM sourced |
| AYR | Restraint Head RR ST Folding, Adjustable | — | Reference |
| AYS | 2010 Oem Engine Physical ID Ays & Production Number 98051455 | — | Reference |
| AYZ | Seat FRT Bkt, Sport, Var 3 | — | Reference |
| AZ0 | Seat FRT Bucket, Low Back, Pass & Driver Recl, Swivel, 4 Way Adj, Lumbar | — | Reference |
| AZ1 | P, RESTRAINT, HEAD, FRT SEAT, CLOTH COVERED, CLOSED SECTION, 224 E, 8 this code has more than one documented meaning — filter by year | — | GM sourced |
| AZ2 | Seat FRT Bucket, Low Back, Pass & Driver Recl, 4 Way Adj | — | Reference |
| AZ3 | Seats, front 40/20/40 split-bench this code has more than one documented meaning — filter by year | 2026 | GM sourced |
| AZ4 | Lock Control Window And Sun Roof, Electric, Remote Closing this code has more than one documented meaning — filter by year | — | Reference |
| AZ5 | Covering Headliner Convertible Top Trim this code has more than one documented meaning — filter by year | — | Reference |
| AZ6 | P, PAS, R, SEAT PASSENGER, FRT BKT, LOW BACK, RECL, 2 WAY ADJUSTER, LUMBAR | 1998 | GM sourced |
| AZ7 | Seat FRT Bucket, High Back, Pass & Driver Recl, 4 Way Adj, Lumbar | — | Reference |
| AZ8 | Seat FRT Bucket, High Back, Pass & Driver Recl, 6 Way Adj, Lumbar | — | Reference |
| AZ9 | Seat FRT Bucket, High Back, Pass & Driver Recl, 2 Way Adj | — | Reference |
| AZA | P, LOCAL, GM OF CANADA (A), CKD OPTION CHINA, 1121 P, 7 7 A | — | Provisional |
| AZB | P, LOCAL, GM OF CANADA (B), CKD OPTION CHINA, 1121 P, 7 7 A | — | Provisional |
| AZC | P, LOCAL, GM OF CANADA (C), CKD OPTION CHINA, 1121 P, 7 7 A | — | Provisional |
| AZD | P, LOCAL, GM OF CANADA (D), CKD OPTION CHINA, 1121 P, 7 7 A | — | Provisional |
| AZE | P, LOCAL, GM OF CANADA (E), CKD OPTION CHINA, 1121 P, 7 7 A | — | Provisional |
| AZF | P, LOCAL, GM OF CANADA (F), CKD OPTION CHINA, 1121 P, 7 7 A | — | Provisional |
| AZG | P, LOCAL, GM OF CANADA (G), CKD OPTION CHINA, 1121 P, 7 7 A | — | Provisional |
| AZH | P, LOCAL, GM OF CANADA (H), CKD OPTION CHINA, 1121 P, 7 7 A | — | Provisional |
| AZI | P, LOCAL, GM OF CANADA (I), 1121 P, 7 7 A | — | Provisional |
| AZJ | P, LOCAL, GM OF CANADA (J), CKD OPTION NIGERIA, 10611 P, 7 7 A | — | Provisional |
| AZK | P, LOCAL, GM OF CANADA (K), CKD OPTION NIGERIA, 10611 P, 7 7 A | — | Provisional |
| AZL | 2012 Oem Engine Physical ID Azl & Production Number 12634327 | — | Reference |
| AZM | 2012 Oem Engine Physical ID Azm & Production Number 12634328 | — | Reference |
| AZN | 2012 Oem Engine Physical ID Azn & Production Number 12634329 | — | Reference |
| AZO | P, LOCAL, GM OF CANADA (O), CKD OPTION VENEZUELA, 10921 P, 7 7 A | — | Provisional |
| AZP | 2012 Oem Engine Physical ID Azp & Production Number 12634330 | — | Reference |
| AZQ | P, LOCAL, GM OF CANADA (Q) VENEZUELA, 11212 P, 7 7 A | — | Provisional |
| AZR | 2012 Oem Engine Physical ID Azr & Production Number 12634331 | — | Reference |
| AZS | 2012 Oem Engine Physical ID Azs & Production Number 12634332 | — | Reference |
| AZT | 2012 Oem Engine Physical ID Azt & Production Number 12634333 | — | Reference |
| AZU | P, LOCAL, GM OF CANADA (U), 1121 P 7, 7, A | — | Provisional |
| AZV | P, LOCAL, GM OF CANADA (V), 1121 P 7, 7, A | — | Provisional |
| AZW | P, LOCAL, GM OF CANADA (W), 1121 P 7, 7, A | — | Provisional |
| AZX | P, LOCAL, GM OF CANADA (X), 1121 P 7, 7, A | — | Provisional |
| AZY | P, LOCAL, GM OF CANADA (Y), 1121 P 7, 7, A | — | Provisional |
| AZZ | P, LOCAL, GM OF CANADA (Z), 1121 P 7, 7, A | — | Provisional |
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.