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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 1–100 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 |
|---|---|---|---|
| J0U | Primary Color Exterior, Red | — | Reference |
| J12 | P, MSM, R MODEL CONVERSION, EXCLUSIVE, 119 E 0 | — | Provisional |
| J13 | P, MSM, R MODEL CONVERSION, BASIC, 119 E 0 | — | Provisional |
| J14 | P, MSM, R MODEL CONVERSION, CONTEMPORARY, 119 E 0 | — | Provisional |
| J15 | P, MSM, R MODEL CONVERSION, SCANDINAVIAN, 119 E 0 | — | Provisional |
| J16 | P, MSM, R MODEL CONVERSION, SELECTION, 119 E 0 | — | Provisional |
| J17 | Brake System Power, FRT Disc 17' & RR Disc 16', Abs | — | Reference |
| J1A | P, MSM, R MODEL CONVERSION, SWISS POLICE | 1999 | GM sourced |
| J1B | P, PAINT SPECIAL, EXTERIOR - SOLID COLOR -LEVEL 1 - SEO, 105 | — | Provisional |
| J1C | P, MSM, R MODEL CONVERSION, UK POLICE, 10530 | — | Provisional |
| J1D | C, PAINT SPECIAL, EXTERIOR, MAGMA RED, 4 DOOR VEHICLE - SEO, 105 | — | Provisional |
| J1E | C, DRS, R DOOR RR, RH, LH, NOT DESIRED - (SEO), 10904 | — | Provisional |
| J1F | P, BRT, R BRAKE PROVISIONS, SPECIAL, TO SUIT FOREIGN REGULATIONS this code has more than one documented meaning — filter by year | 1990 | GM sourced |
| J1G | P, MSM, R MODEL CONVERSION, .COM, 107 | — | Provisional |
| J1H | P, SALES PACKAGE, OLYMPUS CAMPAIGN, 10221 | — | Provisional |
| J1J | P, SALES PACKAGE, BARBOUR CAMPAIGN, 1113 | — | Provisional |
| J1K | P, SALES PACKAGE, STEEL WHEELS IN LIEU OF ALLOY WHEELS (SEO), 10425 | — | Provisional |
| J1L | P, RESTRAINT SYSTEM RR, SEAT #2, SHLDR, RETR, 3 POINT (SEO), 20805 | — | Provisional |
| J41 | P, BKS, M BRAKE SYSTEM, PWR, FRT DISC, RR DRUM, CAST IRON this code has more than one documented meaning — filter by year | 1988 | GM sourced |
| J42 | P, BKS, M BRAKE SYSTEM, PWR, FRT DISC, RR DRUM, ALUMINUM this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| J49 | Brakes, heavy-duty front Brembo | 2026 | GM sourced |
| J50 | P, BKS, M BRAKE SYSTEM, PWR this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| J52 | FRONT DISC BRAKES | — | Provisional |
| J55 | heavy-duty brake package with Brembo front brakes | 2026 | GM sourced |
| J56 | P, BKS, M BRAKE SYSTEM, PWR, FRT & RR DISC, ANTILOCK, FRT & RR WHL, HEAVY DUTY, 20228 E 1 | — | GM sourced |
| J57 | Brake System Pwr, FRT & RR Disc, Antilock, FRT & RR Whl, Heavy Duty, Ceramic Rotors | — | Reference |
| J5N | P, SALES PACKAGE, OFF-ROAD, BASE, 119 | — | Provisional |
| J5P | P, SALES PACKAGE, OFF-ROAD, UPGRADE, 119 | — | Provisional |
| J5Q | P, SALES PACKAGE, WINTER PACK, 119 | — | Provisional |
| J60 | Brake System Power, FRT & RR Disc, Abs, 16' | — | Reference |
| J61 | Brakes, 4-wheel antilock, 4-wheel disc | 2026 | GM sourced |
| J62 | Brake System Power, FRT & RR Disc, Abs, 17+' | — | Reference |
| J63 | Brake System Pwr, FRT & RR Disc, Antilock, FRT & RR Whl, Hvy Duty | — | Reference |
| J64 | Brake System Power, FRT & RR Disc, Abs, 18+ | — | Reference |
| J65 | P, BKS, M BRAKE SYSTEM, PWR, FRT & RR DISC this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| J66 | Brake System Power, FRT & RR Disc, 15' | — | Reference |
| J67 | Brake System Power, FRT & RR Disc, Abs, 15' | — | Reference |
| J69 | P, BRAKE PARKING, MECHANICALLY OPERATED this code has more than one documented meaning — filter by year | 1990 | GM sourced |
| J6A | Caliper Color Black | — | Reference |
| J6B | Caliper Color Zr1 Blue | — | Reference |
| J6C | Caliper Color Silver | — | Reference |
| J6D | Caliper Color DK Gray Met | — | Reference |
| J6E | Caliper Color Yellow | — | Reference |
| J6F | Calipers, Torch Red front and rear | 2026 | GM sourced |
| J71 | P, BRAKE PARKING, POWER OPERATED this code has more than one documented meaning — filter by year | 1990 | GM sourced |
| J77 | Brake Parking Electronically Operated | — | Reference |
| J78 | P, BME, R VALVE AIR BRAKE, MOISTURE EJECTOR this code has more than one documented meaning — filter by year | 1989 | GM sourced |
| J81 | P, INDICATOR, SWITCH, EXPORT this code has more than one documented meaning — filter by year | 1995 | GM sourced |
| J82 | P, VALVE, FRT AIR BRAKE LIMITING this code has more than one documented meaning — filter by year | 1983 | GM sourced |
| J85 | P, INDICATOR, TRANS OIL TEMP this code has more than one documented meaning — filter by year | 1988 | GM sourced |
| J87 | Indicator Manual Trans Shift | — | Reference |
| J90 | Brake Hyd Power, Dual Rear Wheel, 4 Whl Disc, W/o Abs | — | Reference |
| J91 | P, BRT, R BRAKE PROVISIONS, SEMI TRAILER this code has more than one documented meaning — filter by year | 1994 | GM sourced |
| J92 | Brake Active Apply, Disc/disc, W/vses, W/regen, 7700 Lbs | — | Reference |
| J93 | Brake System Power, FRT Disc, RR Drum, Abs, 15' | — | Reference |
| J94 | Brake System Power, FRT Disc, RR Drum, 15' | — | Reference |
| J95 | Brake Hyd Power, Single Rear Wheel, 4 Whl Disc | — | Reference |
| J96 | Brake Hyd Power, Dual Rear Wheel, 4 Whl Disc | — | Reference |
| J97 | Brake System Power, FRT Disc, RR Drum, Abs, 14' | — | Reference |
| JA1 | P, BRK, M BRAKE, LIGHT WEIGHT, DISC/DRUM | 1997 | GM sourced |
| JA2 | P, BRK, M BRAKE, HEAVY WEIGHT, DISC/DRUM | 1997 | GM sourced |
| JA3 | P, HANDLE, PARK BRK RELEASE, CHROME, 1122 E 0 | — | GM sourced |
| JA4 | P, BKS, M BRAKE SYSTEM, PWR, FRT DISC, RR DRUM, CAST IRON, ANTILOCK, RR WHL this code has more than one documented meaning — filter by year | 1987 | GM sourced |
| JA5 | Brake System,power Heavy Duty | — | Reference |
| JA6 | Brake System,manual,extra Light Weight | — | Reference |
| JA7 | P, HANDLE, PARK BRK RELEASE, LEATHER | 1998 | GM sourced |
| JA8 | P, BRK, M BRAKE, MEDIUM WEIGHT, DISC/DRUM | 1998 | GM sourced |
| JA9 | P, BRK, M BRAKE, HEAVY WEIGHT, DISC/DISC | 1992 | GM sourced |
| JAA | Display Hvac, European Regulations | — | Reference |
| JAF | P, BRT, R BRAKE PROVISIONS, EUROPE | 1991 | GM sourced |
| JAG | P, BRT, R, BRAKE PROVISIONS, ABS LOCATION this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| JAH | Brake Provisions Hyd, H-pattern | — | Reference |
| JAI | Brake Provisions Hyd, X-pattern | — | Reference |
| JAN | P, PLT, R, PLANT CODE, JANESVILLE, WI, USA this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| JAU | P, SALES PACKAGE, ULTRA EDITION, 20417 E, 1 | — | GM sourced |
| JB1 | Brake System,manual Disc,drum this code has more than one documented meaning — filter by year | — | Reference |
| JB2 | Brake System,disc,drum | — | Reference |
| JB3 | P, BRK, M, BRAKE, POWER, DISC/DRUM, 4,600 LBS this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JB4 | P, BRT, R, BRAKE PROVISIONS, MASTER CYLINDER, 4 WAY, 10214 E, 5 | — | Provisional |
| JB5 | P, BRK, M, BRAKE, POWER, DISC/DRUM, 6,400 LBS this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JB6 | P, BRK, M, BRAKE, POWER, DISC/DRUM, 7,200 LBS this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JB7 | P, BRK, M, BRAKE, POWER, DISC/DRUM, 8,400 LBS this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JB8 | P, BRK, M, BRAKE, POWER, DISC/DRUM, 10,000 LBS this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JB9 | P, BRK, M, BRAKE, LIGHT WEIGHT, DISC/DISC | 1992 | GM sourced |
| JBC | P, PLT, R, PLANT CODE, JIN BEI, CHINA this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| JBD | Booster Brake, Single Rate | — | Reference |
| JBE | Booster Brake, Dual Rate | — | Reference |
| JBF | P, HANDLE, PARK BRK RELEASE, MATT CHROME KNOB, 11109 E, 0 | — | Provisional |
| JBG | P, HANDLE, PARK BRK RELEASE, HIGH GLOSS CHROME KNOB, 11109 E, 0 | — | Provisional |
| JBH | P, HANDLE, PARK BRK RELEASE, HIGH GLOSS KNOB, 20813 E, 0 | — | Provisional |
| JBK | Brake lining wear indicator | 2026 | GM sourced |
| JBN | P, FIN, R, FLEET INCENTIVE, DOLLAR RENT-A-CAR (C/H/N/U-TRK CK), 20429 | — | Provisional |
| JBP | Brake lining wear indicator | 2026 | GM sourced |
| JC1 | P, BRK, M, BRAKE, VAC POWER, 4 WHL DISC, 5,500 LBS this code has more than one documented meaning — filter by year | 1994 | GM sourced |
| JC2 | P, BRK, M, BRAKE, VAC POWER, 17" DISC/DISC, W/RWAL, 6,800 LBS, 20205 | — | Provisional |
| JC3 | P, BRK, M, BRAKE, VAC POWER, DISC/DISC, 6,400 LBS, 10420 | — | GM sourced |
| JC4 | vacuum-assisted four-wheel disc brakes for 7,200-lb class | 2007 | GM sourced |
| JC5 | P, BRK, M, BRAKE, VAC POWER, 4 WHL DISC, 7,200 LBS this code has more than one documented meaning — filter by year | 1994 | GM sourced |
| JC6 | P, BRK, M, BRAKE, ELECTRO HYDRAULIC APPLY, 17" DISC/DISC, W/VSES, 7700 LBS, 20205 | — | Provisional |
| JC7 | P, BRK, M, BRAKE, POWER, DISC/DRUM, 12,000 LBS this code has more than one documented meaning — filter by year | 1998 | 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.