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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 301–400 of 640 codes beginning with Z. One meaning shown per code — the best-sourced one we hold. Search above for the rest.
| Code | Meaning | Years | Sourcing |
|---|---|---|---|
| ZF4 | Acadian Option(canadian) | — | Reference |
| ZF5 | Acadian Option(canadian) | — | Reference |
| ZF8 | Sales Processing Opt #49 | — | Reference |
| ZFA | Tire Spare P235/75r15 Wol R/pe ST TL Als 105s | — | Reference |
| ZFD | Tire Spare P225/75r15 Wol R/pe ST TL Oor 102s | — | Reference |
| ZFH | Tire Spare Compact, T125/70d16 | — | Reference |
| ZFJ | P, SPT, R, TIRE SPARE, P325/30ZR19-94Y BW TL HW4 EMT, 1204 | — | Provisional |
| ZFK | Tire Spare T135/70r18 96m | — | Reference |
| ZFL | P, SPT, R, TIRE SPARE, P235/75R15-105S BW R/PE ST TL ALS this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| ZFM | Tire Spare | — | Reference |
| ZFN | P, SPT, R, TIRE SPARE, P235/75R15-105S RWL R/PE ST TL ALS this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| ZFO | P, SPT, R, TIRE SPARE, 185/60R14-82H BW R/ST TL, 20509 E 5 | — | Provisional |
| ZFT | Tire Spare P205/75r14/n BL R/pe ST TL Als (9590957) | — | Reference |
| ZFZ | P, SPT, R, TIRE SPARE, 175/65R14-82T BW R/ST TL HWY, 20509 E 5 | — | Provisional |
| ZG1 | P, SALES PROCESSING OPT, #50 | 1998 | Provisional |
| ZG2 | P, SALES PROCESSING OPT, #51 | 1987 | Provisional |
| ZG3 | P, SALES PROCESSING OPT, #52 | 1987 | Provisional |
| ZG4 | P, SALES PROCESSING OPT, #53 | 1987 | Provisional |
| ZG5 | P, SALES PROCESSING OPT, #54 | 1987 | Provisional |
| ZG6 | P, SALES PROCESSING OPT, #55 | 1987 | Provisional |
| ZG7 | P, SALES PROCESSING OPT, #56 | 1987 | Provisional |
| ZG8 | P, SALES PROCESSING OPT, #57 | 1987 | Provisional |
| ZG9 | P, SALES PROCESSING OPT, #58 | 1987 | Provisional |
| ZGA | P, SPT, R, TIRE SPARE, P245/75R16-109S BW R/PE ST TL AT this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| ZGB | P, SPT, R, TIRE SPARE, P245/75R16-109S WOL R/PE ST TL AT this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| ZGC | P, SPT, R, TIRE SPARE, P265/75R16-114S BW R/PE ST TL AT this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| ZGD | P, SPT, R, TIRE SPARE, P265/75R16-114S WOL R/PE ST TL AT this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| ZGI | Tire Spare 8.75r16.5/e BL R/pe ST NY TL Hwy this code has more than one documented meaning — filter by year | — | Reference |
| ZGK | P, SPT, R, TIRE SPARE, LT245/75R16/E BW R/PE ST TL OOR 120Q this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| ZGL | P, SPT, R, TIRE SPARE, LT265/75R16/C BL R/PE ST OOR this code has more than one documented meaning — filter by year | 1988 | GM sourced |
| ZGM | Tire Spare Lt265/70r18/e 124r BW AT this code has more than one documented meaning — filter by year | — | Reference |
| ZGY | Tire Spare P205/70r15 BL R/pe ST TL Als 95s | — | Reference |
| ZH0 | Trim,level 0 | — | Reference |
| ZH1 | Trim,level 1 | — | Reference |
| ZH2 | Trim,level 2 | — | Reference |
| ZH3 | Trim,level 3 | — | Reference |
| ZH4 | Acdelco H4 Engines | — | Reference |
| ZHA | P, SPT, R, TIRE SPARE, P235/75R15/X BW R/PE ST TL ALS this code has more than one documented meaning — filter by year | 1988 | GM sourced |
| ZHB | P, SPT, R, TIRE SPARE, P235/75R15/X WS2 R/PE ST TL ALS this code has more than one documented meaning — filter by year | 1988 | GM sourced |
| ZHC | P, SPT, R, TIRE SPARE, P235/65R17-103H BW TL AL3, 11120 | — | Provisional |
| ZHD | P, SPT, R, TIRE SPARE, P255/60R17-105H BW TL AL3, 11120 | — | Provisional |
| ZHE | Tire Spare Lt225/75r16/c BL R/pe ST Als(9591202) | — | Reference |
| ZHF | P, SPT, R, TIRE SPARE, LT225/75R16/E BL R/PE ST ALS this code has more than one documented meaning — filter by year | 1988 | GM sourced |
| ZHH | P, SPT, R, TIRE SPARE, LT245/75R16/E BW R/PE ST TL ALS 120Q this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| ZHJ | Tire Spare Lt225/75r16/c BL R/pe ST Oor this code has more than one documented meaning — filter by year | — | Reference |
| ZHM | P, SPT, R, TIRE SPARE, P235/75R15-108S WOL R/PE ST TL ALS (X/LOAD) this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| ZHN | P, SPT, R, TIRE SPARE, LT225/75R16/C WOL R/PE ST OOR this code has more than one documented meaning — filter by year | 1988 | GM sourced |
| ZHP | P, SPT, R, TIRE SPARE, LT225/75R16/D BL R/PE ST TL ALS this code has more than one documented meaning — filter by year | 1988 | GM sourced |
| ZHQ | Tire, spare LT245/75R17E all-season, blackwall this code has more than one documented meaning — filter by year | 2026 | GM sourced |
| ZHR | P, SPT, R, TIRE SPARE, LT225/75R16/D BL R/PE ST TL OOR this code has more than one documented meaning — filter by year | 1988 | GM sourced |
| ZHS | P, SPT, R, TIRE SPARE, P265/75R16-114H BW R/PE ST TL AT "A" TEMP RATING this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| ZHT | Tire Spare 265/75r16-116h BW TL AT | — | Reference |
| ZHV | Tire Spare Lt225/75r16/c WS R/ PE ST Als (9591301) | — | Reference |
| ZHW | P, SPT, R, TIRE SPARE, LT315/70R17 BW TL OOR, 522 | — | GM sourced |
| ZHY | Tire Spare Lt315/70r17/d BW TL All Terrain | — | Reference |
| ZHZ | Sales Package Hertz | — | Reference |
| ZIK | P, SPT, R, TIRE SPARE, P245/70R16-106S BW PE/ST TL OOR this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| ZIN | Tire Spare P205/70r15/n BL R/pe ST TL Al2 95s | — | Reference |
| ZIT | Tire Spare Lt265/75r16/e BW R/pe ST TL Oor (123/120r) | — | Reference |
| ZIZ | Tire Spare Lt245/75r16/e BW TL Als 120q | — | Reference |
| ZJ1 | Fleet Incentive Phillips Electronics North America | — | Reference |
| ZJ2 | P, FIN, R, FLEET INCENTIVE, PHILLIPS PETROLEUM (B/C/H/N/U/W-TRK CKGMLST), 829 | — | GM sourced |
| ZJ3 | INTERIOR CONVENIENCE PACKAGE | — | Provisional |
| ZJ4 | Fleet Incentive Becks Superior Hybrid (7l/w-trk Ckmlrv) this code has more than one documented meaning — filter by year | — | Reference |
| ZJ5 | Molding,exterior,lower | — | Reference |
| ZJ6 | Fuel Economy Package | — | Reference |
| ZJ7 | Wheel,hub Cap And Trim Ring(special) | — | Reference |
| ZJ9 | Lighting Group,auxiliary | — | Reference |
| ZJB | C, SPT, R, TIRE SPARE, 225/70R17.5 BW R/ST TL OOR | 1995 | Provisional |
| ZJC | P, SPT, R, TIRE SPARE, 275/70R22.5 BW R/ST TL OOR | 1995 | Provisional |
| ZJD | P, SPT, R, TIRE SPARE, 275/70R22.5 R TL LOW PROFILE, 101 E 8 | — | Provisional |
| ZJE | Tire Spare 245/70r16 SL 111 S BW Hwy | — | Reference |
| ZJG | P, SPT, R, TIRE SPARE, 165R14/D 8PR BL R/ST TT HWY (GVM 4200) | 1997 | Provisional |
| ZJJ | P, SPT, R, TIRE SPARE, 31X10.50R15LT/C BW R/PE ST TL OOR this code has more than one documented meaning — filter by year | 1990 | GM sourced |
| ZJK | Tire Spare 215/70r16 108/106s BW 6pr Hwy | — | Reference |
| ZJL | Tire P205/75 R15 Sbr (tbls Oor WL | — | Reference |
| ZJM | P, SPT, R, TIRE SPARE, P265/70R17-113S WOL R/PE ST TL OOR | 1999 | GM sourced |
| ZJP | P, SPT, R, TIRE SPARE, P265/70R17-113S BW R/PE ST TL OOR, 21022 | — | GM sourced |
| ZJT | Tire,spare | — | Reference |
| ZK1 | P, IDENTIFICATION, PSIR NEW DESIGN | 1994 | GM sourced |
| ZK2 | P, VEHICLE, LABEL, EXPORT FUEL ECONOMY | 1989 | GM sourced |
| ZK3 | P, IDENTIFICATION, PULL-A-HEAD DESIGN this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| ZK5 | CONCOURS SEDAN | — | Provisional |
| ZK6 | CONCOURS SPORT COUPE | — | Provisional |
| ZK7 | CONCOURS SPORT COUPE | — | Provisional |
| ZK8 | TIRE PRESSURE LABEL | — | Provisional |
| ZK9 | P, FIN, R, FLEET INCENTIVE, PHILLIP MORRIS (C/D/G/H/K/L/N/U/V/W-TRK CKGMPST), 20612 | — | Provisional |
| ZKK | P, SPT, R, TIRE SPARE, 7.00RX16 8PR BW TT RADIAL HWY, 209 E 8 | — | Provisional |
| ZKL | P, SPT, R, TIRE SPARE, 7.50RX16 8PR BW TT RADIAL HWY, 209 E 8 | — | Provisional |
| ZKM | P, SPT, R, TIRE SPARE, 7.50RX16 12PR BW LT TT RADIAL HWY, 209 E 8 | — | Provisional |
| ZKQ | P, SPT, R, TIRE SPARE, 175RX14 8PR BW TT LT RADIAL HWY, 210 E 8 | — | Provisional |
| ZKR | P, SPT, R, TIRE SPARE, P245/45R18-96W BW R/PE ST TL AL3, 20510 | — | Provisional |
| ZKS | P, SPT, R, TIRE SPARE, P235/50R17-95V BW R/PE ST TL AL3, 20305 | — | Provisional |
| ZKU | Tire Spare P235/50r18-97h BW R/pe ST Al3 | — | Reference |
| ZKZ | P, SPT, R, TIRE SPARE, 195/60R15-87V TL R/ST, 10201 E 5 | — | Provisional |
| ZL1 | P, NOISE CONTROL, WITH LESS THAN 8,000 LB GVW this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| ZL2 | SPECIAL HOOD, COWL INDUCTION | — | Provisional |
| ZL3 | P, SALES PACKAGE, CONVENIENCE | 1998 | GM sourced |
| ZL4 | P, SALES PACKAGE, CONVENIENCE III this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| ZL6 | ProGrade Trailering System | 2026 | 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.