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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 201–300 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 |
|---|---|---|---|
| JJU | Headliner Subassembly Not Installed (modular Optimization Method Only) | — | Reference |
| JK1 | P, INDICATOR, LOW TIRE PRESSURE --- DELETE, 10312 E, 1 | — | GM sourced |
| JK4 | Brake Hyd Power, 4 Whl Disc, 12, 300 Lbs-w/o Abs | — | Reference |
| JL0 | Control Active Brake Not Desired | — | Reference |
| JL1 | Trailer brake controller, integrated | 2026 | GM sourced |
| JL2 | P, BRK, M, BRAKE, FRT DISC, SINGLE PISTON | 1983 | GM sourced |
| JL3 | P, CONTROL, MANUAL TRANS, ACTIVE BRAKE | 1997 | Provisional |
| JL4 | P, CONTROL, ACTIVE BRAKE | 1994 | GM sourced |
| JL5 | P, CONTROL, MANUAL TRANS, FIRST TO FOURTH GEAR SKIP SHIFT, 10912 E, 1 | — | GM sourced |
| JL6 | P, BKS, M, BRAKE SYSTEM, MAN, FRT DISC, RR DRUM, CAST IRON this code has more than one documented meaning — filter by year | 1985 | GM sourced |
| JL7 | Control Active Steering | — | Reference |
| JL8 | P, BKS, M, BRAKE SYSTEM, PWR, FRT & RR DISC, ANTILOCK, RR WHEEL | 1993 | Provisional |
| JL9 | P, BKS, M, BRAKE SYSTEM, PWR, FRT & RR DISC, ANTILOCK, FRT & RR WHL this code has more than one documented meaning — filter by year | 1987 | GM sourced |
| JM0 | Booster Brake, Single | — | Reference |
| JM2 | Booster Brake, Tandem | — | Reference |
| JM3 | P, BRB, M, BOOSTER, BRAKE, 240MM TANDEM, HIGH FLOW this code has more than one documented meaning — filter by year | 1989 | GM sourced |
| JM4 | P, BKS, M, BRAKE SYSTEM, PWR, FRT DISC, RR DRUM, CAST IRON, ANTILOCK, FRT &RR WHL this code has more than one documented meaning — filter by year | 1987 | GM sourced |
| JM5 | P, BRB, M, BOOSTER, BRAKE, 200MM TANDEM, HIGH FLOW this code has more than one documented meaning — filter by year | 1989 | GM sourced |
| JM7 | P, BRB, M, BOOSTER, BRAKE, HYD, HI PERFORMANCE this code has more than one documented meaning — filter by year | 1993 | GM sourced |
| JM8 | Brake, automatic vehicle hold this code has more than one documented meaning — filter by year | 2026 | GM sourced |
| JM9 | Brake Hyd Power, 4 Whl Disc, 7, 700 Lbs | — | Reference |
| JN1 | P, VALVE, FUEL ADDITIVE PROPORTIONING CONTROL | 1999 | Provisional |
| JN2 | P, EQUIPMENT, REGION SPECIFIC, 411 E, 8 | — | Provisional |
| JNA | Brake System Pwr, FRT Disc, RR Drum, Antilock, FRT & RR Whl | — | Reference |
| JNB | Booster Brake, Single, 254 MM | — | Reference |
| JNC | P, EQUIPMENT, FOUR PISTON RR DISC BRAKE this code has more than one documented meaning — filter by year | 1993 | GM sourced |
| JNF | Sales Package Korea, LT (1) | — | Reference |
| JNG | P, SHAFT, PROP, PAINTED this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JNH | C, PROVISIONS, BRAKE PADS, SPECIAL THICKNESS this code has more than one documented meaning — filter by year | 1993 | GM sourced |
| JNI | Latch Lock, Side Door, Overide | — | Reference |
| JNJ | Sales Package Korea, LT (2) | — | Reference |
| JNK | C, EQUIPMENT, AIR BRAKE MOISTURE EJECTOR, TWO ADDITIONAL this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JNL | C, TANK, AIR, RR, RELOCATE FROM RR CROSSMEMBER this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JNM | P, CORD, DRAIN VALVE this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| JNN | Valve Exhaust Gas Recirculation | — | Reference |
| JNO | Sales Package Korea, LS | — | Reference |
| JNP | C, PROVISIONS, UJOINT UPGRADE, 10130 | — | Provisional |
| JNQ | Equipment,equalizer,cassette | — | Reference |
| JNS | C, EQUIPMENT, PROP SHAFT CENTER BEARING HANGER | 1999 | GM sourced |
| JNW | C, EQUIPMENT, RR BRAKE CHAMBER BRAND ANCHORLOC LIFE SEAL this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JNX | P, VALVE, TRACTOR PARKING BRK CONTROL this code has more than one documented meaning — filter by year | 1986 | GM sourced |
| JNY | C, VALVE, - DELETE this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JOA | Package Gmdat 'a' | — | Reference |
| JOB | Package Gmdat 'b' | — | Reference |
| JOC | Package Gmdat 'c' | — | Reference |
| JOD | Package Gmdat 'best' | — | Reference |
| JOE | Package Gmdat 'e' | — | Reference |
| JOF | Package Gmdat 'f' | — | Reference |
| JOG | Package Gmdat 'g' | — | Reference |
| JP2 | P, PEDALS, DOUBLE, DRIVING SCHOOL, 20806 E, 0 | — | GM sourced |
| JPB | P, UJT, R, JOINT MAIN, SPICER 1480 SERIES this code has more than one documented meaning — filter by year | 1991 | GM sourced |
| JPC | P, UJT, R, JOINT MAIN, UNIVERSAL, SPL55 SERIES this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JPD | P, UJT, R, JOINT MAIN, UNIVERSAL, SPL70 SERIES this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JPE | P, UJT, R, JOINT MAIN, UNIVERSAL, SPL100 SERIES this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JPF | P, UJT, R, JOINT MAIN, UNIVERSAL, SPL140 SERIES this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JPG | P, UJT, R, JOINT MAIN, UNIVERSAL, SPL170 SERIES this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JPH | P, JTI, R, JOINT INTER AXLE, UNIVERSAL, SPL100 SERIES this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JPJ | P, JTI, R, JOINT INTER AXLE, UNIVERSAL, SPL140 SERIES this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JPK | P, BRU, R, BRAKE RATING RR, AIR CARLISLE, MB23, NON ASBESTOS LINING, 5.5IN SLACK, 16.5X7 FAB SHOE, 16 HOLE MTG, 15 BOLT this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| JPL | Brake Rating RR Air, Ma312, Non Asbestos Lining 6.0in Slack, 16.5x7 Fab Shoe, 16 Hole Mtg, 15 Bolt | — | Reference |
| JPR | Tank Fuel, Relocate Forward | — | Reference |
| JPS | C, PROVISIONS, BRAKE RATING RR, 20,000# | 1991 | GM sourced |
| JPT | C, TANK, AIR, RELOCATE, RH SIDE, 418 | — | Provisional |
| JPU | C, HANDLE, PARK BRK RELEASE, NON-ADJUSTABLE this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| JPV | P, BRU, R, BRAKE RATING RR, AIR CARLISLE, NAB9ML, NON-ASBESTOS LINING, 5.5 IN SLACK, 16.5X7 FAB SHOE, 16 HOLE MTG- 15 BOLT this code has more than one documented meaning — filter by year | 1996 | GM sourced |
| JPW | Brake System Power, FRT Disc, RR Drum, 14' | — | Reference |
| JPX | P, TANK, AIR, RELOCATE, BEVERAGE SPECIAL this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| JPY | C, BAC, R, AIR DRYER, HEATED this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JPZ | P, VALVE, AIR SUSPENSION AIR RELEASE this code has more than one documented meaning — filter by year | 1992 | GM sourced |
| JQ5 | Brake System Power, FRT Disc 18+' & RR Disc 17', Abs | — | Reference |
| JQB | P, UJT, R, JOINT MAIN, UNIVERSAL, 1480/148N SERIES this code has more than one documented meaning — filter by year | 1988 | GM sourced |
| JQE | P, JTI, R, JOINT INTER AXLE, UNIVERSAL, 1480/148N SERIES this code has more than one documented meaning — filter by year | 1988 | GM sourced |
| JQF | P, BAR, R, BRAKE ADJUSTER RR, SLACK, ROCKWELL AUTOMATIC this code has more than one documented meaning — filter by year | 1996 | GM sourced |
| JQJ | P, JOINT, CUSTOMER PREFERANCE, UNIVERSAL this code has more than one documented meaning — filter by year | 1991 | GM sourced |
| JQM | P, UJT, R, JOINT MAIN, UNIVERSAL, 1710/17N SERIES this code has more than one documented meaning — filter by year | 1988 | GM sourced |
| JQN | P, JTI, R, JOINT INTER AXLE, UNIVERSAL, 1710/17N SERIES this code has more than one documented meaning — filter by year | 1988 | GM sourced |
| JQP | P, UJT, R, JOINT MAIN, UNIVERSAL, 1550/155N SERIES this code has more than one documented meaning — filter by year | 1988 | GM sourced |
| JQQ | P, UJT, R, JOINT MAIN, UNIVERSAL, 1710/17N SERIES, H.D. TUBE this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JQR | P, UJT, R, JOINT MAIN, UNIVERSAL, 1610/161N SERIES this code has more than one documented meaning — filter by year | 1996 | GM sourced |
| JQS | U-joint,main,1550 Series | — | Reference |
| JQT | C, EQUIPMENT, RR BRAKE CHAMBER BRAND, MGM (MODEL TR-TS) this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| JQU | U-joint,main,1610 Series | — | Reference |
| JQV | U-joint,inter Axle,spicer 1610 Series | — | Reference |
| JQX | P, BRT, R, BRAKE PROVISIONS, CYLINDER REAR WHEEL (INCREASED SIZE-FOR CKD ONLY) | 1993 | GM sourced |
| JQY | P, FBR, R, BRAKE RATING FRT, AIR ABEX, 3030-197 NON-ASBESTOS LINING, 5.5 INCH SLACK, 15 X 4, FABE SHOE, 8 HOLE MTG this code has more than one documented meaning — filter by year | 1995 | GM sourced |
| JQZ | P, FBR, R, BRAKE RATING FRT, AIR ABEX, 931-162 NON-ASBESTOS LINING, 5.5 INCH SLACK, 16.5 X 6, FABE SHOE, 8 HOLE MTG this code has more than one documented meaning — filter by year | 1991 | GM sourced |
| JR9 | P, VALVE, BRAKE PROPORTIONING CONTROL | 1984 | Provisional |
| JRA | P, JTI, R, JOINT INTER AXLE, UNIVERSAL, 1610/161N SERIES this code has more than one documented meaning — filter by year | 1988 | GM sourced |
| JRB | P, UJT, R, JOINT MAIN, UNIVERSAL, 1410/141N SERIES, H.D. TUBE this code has more than one documented meaning — filter by year | 1988 | GM sourced |
| JRC | P, PROVISIONS, BRAKE ADJUSTERS-LUBE FOR LIFE this code has more than one documented meaning — filter by year | 1996 | GM sourced |
| JRD | P, FBR, R, BRAKE RATING FRT, AIR CARLISLE, E145A, NON-ABESTOS LINING, 5.5 INCH SLACK, 15 X 4, FAB SHOE & 4- OR 8-HOLE MTG this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JRE | P, FBR, R, BRAKE RATING FRT, AIR ROCKWELL, ABX 197, NON-ASBESTOS LINING, 5.5 INSLACK, 15 X 5, FAB SHOE, 8 HOLE MTG | 1998 | GM sourced |
| JRF | P, SHIELD, RR BRAKES, DUST this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JRG | P, FBR, R, BRAKE RATING FRT, AIR ABEX 197, NON-ASBESTOS LINING, 5.5 IN SLACK, 15 X 4, FAB SHOE & 4 OR 8 HOLE MTG this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JRH | P, FBR, R, BRAKE RATING FRT, AIR ABEX 197, 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 |
| JRI | P, BRU, R, BRAKE RATING RR, AIR ABEX 197, NON-ASBESTOS LINING, 5.5 IN SLACK, 16.5 X 7, FAB SHOE, 10 HOLE MTG this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JRJ | P, BRU, R, BRAKE RATING RR, AIR CARLISLE, NAB 456, NON-ASBESTOS LINING, 6.0 IN SLACK, 16.5 X 7 CAST SHOE, 16 HOLE MTG this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JRL | P, BRU, R, BRAKE RATING RR, AIR CARLISLE, E145A, NON-ASBESTOS LINING, 5.5 IN SLACK, 16.5 X 7, FAB SHOE, 10 HOLE MTG this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JRM | P, BRU, R, BRAKE RATING RR, AIR ROCKWELL, ABX 197, NON-ASBESTOS LINING, 5.5 INSLACK, 15 X 8.625 FAB SHOE, 12 HOLE MTG, 7.125 B.C this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| JRN | P, BRU, R, BRAKE RATING RR, AIR CARLISLE, E145A, NON-ASBESTOS LINING, 6.0 IN SLACK, 16.5 X 7, FAB SHOE & 9-HOLE MTG 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.