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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 301–353 of 353 codes beginning with J. One meaning shown per code — the best-sourced one we hold. Search above for the rest.
| Code | Meaning | Years | Sourcing |
|---|---|---|---|
| JRO | P, BRU, R, BRAKE RATING RR, AIR ABEX 197, NON-ASBESTOS LINING, 5.5 IN SLACK, 16.5 X 7, FAB SHOE, 16 HOLE MTG this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JRQ | P, BRU, R, BRAKE RATING RR, AIR CARLISLE, NAB9ML, NON-ASBESTOS LINING, 5.5 IN SLACK, 16.5 X 7, FAB SHOE & 9-HOLE MTG | 1998 | GM sourced |
| JRR | P, FBR, R, BRAKE RATING FRT, AIR ARVIN MERITOR MA212, NON-ASBESTOS LINING, 5.5 IN SLACK 15 X 4, FAB.SHOE & 4 OR 8 HOLE MTG, 929 | — | GM sourced |
| JRS | P, BRU, R, BRAKE RATING RR, AIR ARVIN MERITOR MA212, NON-ASBESTOS LINING, 5.5 IN SLACK 16.5 X 7, FAB. SHOE, 10 HOLE MTG, 929 | — | GM sourced |
| JRT | P, BRU, R, BRAKE RATING RR, AIR ARVIN MERITOR MA212, NON-ASBESTOS LINING, 5.5 IN SLACK 16.5 X 7, FAB. SHOE, 16 HOLE MTG, 929 | — | GM sourced |
| JRU | Expello Moisture Ejector Valve For Air Brks | — | Reference |
| JRV | P, FBR, R, BRAKE RATING FRT, AIR ARVIN MERITOR MA212, NON-ASBESTOS LINING, 5.5 IN SLACK 16.5 X 5, FAB. SHOE, 8 HOLE MTG, 10118 | — | GM sourced |
| JRW | P, GUARDS, PROPSHAFT this code has more than one documented meaning — filter by year | 1991 | GM sourced |
| JS6 | P, GVW, M, GVW RATING, 5,666 LBS/2,570 KG, 20206 E, 1 | — | Provisional |
| JT1 | P, GVW, M, GVW RATING, 6,125 LBS, 10524 | — | Provisional |
| JT2 | P, GVW, M, GVW RATING, 6,275 LBS, 20805 | — | Provisional |
| JT3 | P, GVW, M, GVW RATING, 6,375 LBS, 10524 | — | Provisional |
| JTC | P, BAR, R, BRAKE ADJUSTER RR, SLACK, EATON MANUAL | 1992 | GM sourced |
| JTE | P, BAF, R, BRAKE ADJUSTER FRT, SLACK, EATON MANUAL | 1992 | GM sourced |
| JTF | P, BAF, R, BRAKE ADJUSTER FRT, SLACK, ROCKWELL MANUAL this code has more than one documented meaning — filter by year | 1992 | GM sourced |
| JTG | P, BAR, R, BRAKE ADJUSTER RR, SLACK, ROCKWELL MANUAL this code has more than one documented meaning — filter by year | 1992 | GM sourced |
| JTI | Family Code, Joint Inter Axle | 1991 | GM dated |
| JTJ | P, BAR, R, BRAKE ADJUSTER RR, SLACK, EATON AUTOMATIC this code has more than one documented meaning — filter by year | 1992 | GM sourced |
| JTK | P, BAF, R, BRAKE ADJUSTER FRT, SLACK, EATON AUTOMATIC this code has more than one documented meaning — filter by year | 1992 | GM sourced |
| JTL | P, PROVISIONS, AIR DRYER RELOCATE | 1994 | GM sourced |
| JTM | C, TANK, AIR, RELOCATE, UNDER CAB this code has more than one documented meaning — filter by year | 1989 | GM sourced |
| JTN | Brake,rear,air Eaton,esb541 Lining,6.0 Inch Slack,16.5x7 | — | Reference |
| JTO | P, PROVISIONS, COMPUTER SCREEN BLANKING this code has more than one documented meaning — filter by year | 1995 | GM sourced |
| JTP | Brake Lining,rear,air Eaton,ext Serv Non-asbestos,brand Preference this code has more than one documented meaning — filter by year | — | Reference |
| JTQ | Slack Adjusters,5 1/2 Inch,rear | — | Reference |
| JTS | Brake Rating,rr 21,000 TO 21,999 Lbs Air Eaton Es-600 Non-asbestos Lin | — | Reference |
| JTT | P, BAC, R, AIR DRYER, HEATED, BRAKE AIR TANK this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JTU | P, BAC, R, AIR DRYER, HEATED, BRAKE AIR TANK, PREMIUM this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| JTW | C, BAC, R, AIR DRYER, B/W MODEL, AD-SP, HEATED, BRAKE AIR TANK | 1998 | GM sourced |
| JUE | P, BAF, R, BRAKE ADJUSTER FRT, SLACK, ROCKWELL AUTOMATIC this code has more than one documented meaning — filter by year | 1996 | GM sourced |
| JUP | Brake,rear Air Carlisle,nab9ml Non-asbestos Lining,6.0 Inch Slack | — | Reference |
| JUW | Brake Chambers,rear,anchorlok | — | Reference |
| JUZ | P, EQUIPMENT, RR BRAKE CHAMBER BRAND, MGM (MODEL TR-T) this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| JVA | P, BKS, M, BRAKE SYSTEM, ANTILOCK BRAKE - DELETE this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JVQ | P, FBR, R, BRAKE RATING FRT, AIR CARLISLE, E145A, NON-ASBESTOS LINING, 5.5 IN SLACK, 16.5 X 5, FAB SHOE & 8 HOLE MTG this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JVR | Brake,front Air Carlisle,nab9ml Non-asbestos Lining,5.5 Inch Slack | — | Reference |
| JWB | P, BRU, R, BRAKE RATING RR, AIR CARLISLE, E145A, NON-ASBESTOS LINING, 5.5 IN SLACK, 16.5 X 7, FAB SHOE, 16 HOLE MTG this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JWE | Air Tanks,relocate Under Battery Box | — | Reference |
| JWF | P, BRU, R, BRAKE RATING RR, AIR CARLISLE, E145A, NON-ASBESTOS LINING, 6.0 IN SLACK, 16.5 X 7, FAB SHOE, 16 HOLE MTG this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JXD | P, UJT, R, JOINT MAIN, UNIVERSAL, 1760/176N SERIES, H.D. TUBE this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JXG | P, BME, R, VALVE AIR BRAKE, MOISTURE EJECTOR, HEATED FRT this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JXN | U-joint,main 1410 Series,heavy Duty Tube | — | Reference |
| JXS | U-joint,main 1810/18n Series | — | Reference |
| JXU | U-joint,main Rockwell 148n Series | — | Reference |
| JXW | Air Dryer,b/w Model Ad4 Heated Brake Air Tank | — | Reference |
| JYV | P, BRT, R, BRAKE PROVISIONS, FULL TRAILER this code has more than one documented meaning — filter by year | 1994 | GM sourced |
| JZB | P, BCF, R, CHAMBER FRT, BRAKE (TYPE 12) this code has more than one documented meaning — filter by year | 1989 | GM sourced |
| JZC | P, BCF, R, CHAMBER FRT, BRAKE (TYPE 16) this code has more than one documented meaning — filter by year | 1996 | GM sourced |
| JZD | P, BCF, R, CHAMBER FRT, BRAKE (TYPE 20) this code has more than one documented meaning — filter by year | 1996 | GM sourced |
| JZE | P, BCF, R, CHAMBER FRT, BRAKE (TYPE 24) this code has more than one documented meaning — filter by year | 1996 | GM sourced |
| JZF | P, BCR, R, CHAMBER RR, BRAKE (TYPE 30) this code has more than one documented meaning — filter by year | 1996 | GM sourced |
| JZG | P, BCR, R, CHAMBER RR, BRAKE (TYPE 24) this code has more than one documented meaning — filter by year | 1996 | GM sourced |
| JZP | Air Brake, 16.5 X 7,abb551c Lng, 6' Slack Adj,9 Hole MT | — | 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.