GM RPO Code Database

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By FullSizeChevy.com Updated

Search the code list

24,366
codes on file
51,776
documented meanings
1973–2026
model years

Type a code, or describe the option in words. Every entry says where the meaning came from and which years we hold it for, because an RPO code can mean different things in different eras and a list that hides that is worse than no list.

CodeMeaningYearsSourcing
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 601–700 of 922 codes beginning with U. One meaning shown per code — the best-sourced one we hold. Search above for the rest.

CodeMeaningYearsSourcing
UKV Trailer Side Blind Zone Alert 2026 GM sourced
UKW Blind Zone Steering Assist with Trailering 2026 GM sourced
UKZ Enhanced Automatic Parking Assist 2026 GM sourced
UL0 P, RDO, M, RADIO, AM/FM STEREO, SEEK/SCAN, AUTO REV MUSIC SEARCH CASS, AUTO TONE, CLOCK, ETR 1998 GM sourced
UL1 P, RDO, M, RADIO, AM/FM STEREO, CLOCK, ETR this code has more than one documented meaning — filter by year 1984 GM sourced
UL2 P, FRE, R, FREQUENCIES, EUROPEAN 1997 GM sourced
UL3 P, RDO, M, RADIO, AM/FM STEREO, SEEK/SCAN, AUTO REV CASS, LED, SECURITY, CODED DETACHABLE PANEL, LOW PERF. SOUND 1999 GM sourced
UL4 P, FRE, R, FREQUENCIES, SOUTH AMERICA 1997 GM sourced
UL5 P, RDO, M, RADIO, - DELETE this code has more than one documented meaning — filter by year 1998 GM sourced
UL6 P, RDO, M, RADIO, AM STEREO/FM STEREO, WX, SEEK/SCAN, AUTO REV MUSICSEARCH CASS, RDS, CD, CLOCK, ETR 1996 GM sourced
UL7 P, RDO, M, RADIO, AM STEREO/FM STEREO, DSP, CLOCK, ETR 1996 GM sourced
UL8 P, FRE, R, FREQUENCIES, SAUDI ARABIAN 1997 GM sourced
UL9 P, RDO, M, RADIO, AM/FM STEREO, SEEK/SCAN, AUTO REV MUSIC SEARCH CASS, CD, AUTO TONE, CLOCK, ETR, BOSE this code has more than one documented meaning — filter by year 1997 GM sourced
ULA Radio Am/fm Stereo, Seek/scan, Cd, Auto Tone, Etr, MP3 — Reference
ULD Audio Control RR Seat & Earphone Jacks, Display — Reference
ULG Audio Control RR Seat, Display, Chauffeur Mode — Reference
ULM Driver Attention Assist 2026 GM sourced
ULS Lock Control Steering Column — Reference
ULT P, APP, R, APPEARANCE PACKAGE, CADILLAC ESCALADE ESV, ULTIMATE, 20604 — GM sourced
ULV AT4X AEV Edition this code has more than one documented meaning — filter by year 2026 GM sourced
ULZ Performance Package Z06 Carbon Limited Edition — Reference
UM1 P, RDO, M, RADIO, AM/FM STEREO, AUTO REVERSE CASS, EQUALIZER, CLOCK,ETR, WITH COMPACT DISC 1993 GM sourced
UM2 P, RDO, M, RADIO, AM/FM STEREO, SEEK/SCAN, AUTO REV CASS, COMPACT DISC PROVISIONS, ETR 1994 GM sourced
UM3 P, RDO, M, RADIO, AM STEREO-FM STEREO, SEEK/SCAN, COMPACT DISC, CLOCK, ETR this code has more than one documented meaning — filter by year 1998 GM sourced
UM4 P, RDO, M, RADIO, AM STEREO/FM STEREO, DSP, ETR this code has more than one documented meaning — filter by year 1999 GM sourced
UM5 P, RDO, M, RADIO, AM STEREO/FM STEREO, DSP, WX, RDS, SEEK/SCAN, AUTO REV MUSIC SEARCH CASS, CD, CLOCK, ETR 1995 GM sourced
UM6 P, RDO, M, RADIO, AM/FM STEREO, SEEK/SCAN, AUTO REV CASS, CLOCK, ETR this code has more than one documented meaning — filter by year 1985 GM sourced
UM7 P, RDO, M, RADIO, AM/FM STEREO, SEEK/SCAN, CLOCK, ETR this code has more than one documented meaning — filter by year 1985 GM sourced
UM8 P, RDO, M, RADIO, AM/FM STEREO, SEEK/SCAN, CD, ETR, NAVIGATION, CLOCK 1999 GM sourced
UM9 P, RDO, M, RADIO, AM STEREO/FM STEREO, DSP, WX, HPS, RDS, SEEK/SCAN,AUTO REV MUSIC SEARCH CASS, MCD, CLOCK, ETR 1995 GM sourced
UMB Radio Am/fm Stereo, Seek Scan, Multi Cd, Auto Tone Clock, Etr, Mp3, Rds, XM — Reference
UMI Radio Am/fm Stereo, Cd, Caf Provisions, USB — Reference
UMN Speedometer Inst, Miles & Kilo, Miles Odometer — Reference
UMQ Gage Auxilary, Multifunction — Reference
UMR Radio Am/fm Stereo, Seek/scan, Clock, Etr, Aux Mono Input — Reference
UMS Multimedia System Removable Hard Disk Drive Storage Cartridge And A Fixed Player — Reference
UMT Radio Am/fm Stereo, Seek/scan, Clock, Etr, USB — Reference
UMU Radio Am/fm Stereo, Seek/scan, Mcd, Etr, MP3 — Reference
UMZ Gage Auxiliary Multifunction W/boost (english Only) — Reference
UN0 P, RDO, M, RADIO, AM/FM STEREO, SEEK/SCAN, CD, AUTO TONE, CLOCK, ETR 1998 GM sourced
UN1 P, RDO, M, RADIO, AM/FM STEREO, SEEK/SCAN, CD, CLOCK, EQLZR, AUTO REVERSE CASS, ETR this code has more than one documented meaning — filter by year 1998 GM sourced
UN2 P, RDO, M, RADIO, AM/FM STEREO, SEEK/SCAN, CD, BASS/TREBLE, CLOCK, ETR, AUTO REVERSE CASS 1998 GM sourced
UN3 P, RDO, M, RADIO, AM/FM STEREO, CASSETTE, MTR this code has more than one documented meaning — filter by year 1997 GM sourced
UN4 P, TAPE, CARTRIDGE - DELETE this code has more than one documented meaning — filter by year 1998 GM sourced
UN5 P, RDO, M, RADIO, AM/FM STEREO, SEEK, AUTO REV CASS, ETR, FADER 1997 GM sourced
UN6 P, RDO, M, RADIO, AM/FM STEREO, SEEK/SCAN, AUTO REV MUSIC SEARCH CASS, CLOCK, ETR this code has more than one documented meaning — filter by year 1998 GM sourced
UN7 P, RDO, M, RADIO, AM/FM STEREO, AUTO REVERSE CASS, AUTO TONE CONTROLCLOCK, ETR, COMPACT DISC this code has more than one documented meaning — filter by year 1993 Provisional
UN8 P, RDO, M, RADIO, AM/FM STEREO, COMPACT DISC, AUTO TONE CONTROL, CLOCK, ETR, AUTO REVERSE CASS this code has more than one documented meaning — filter by year 1993 Provisional
UN9 Radio Suppression - Additional ground straps to be installed by the customer or upfitter this code has more than one documented meaning — filter by year 2026 GM sourced
UNA C, TLR, R, WIRING HARNESS, 8 WIRE TRAILER this code has more than one documented meaning — filter by year 1997 GM sourced
UNB C, TLR, R, WIRING HARNESS, 8 WIRE TRAILER W/O BODY DOME LIGHT 1998 GM sourced
UNC Plant Code, Union City,in,usa — Reference
UNE C, SWITCH, TRANSMISSION INTERLOCK this code has more than one documented meaning — filter by year 1999 GM sourced
UNG P, LAMP, ABS TRAILER WARNING 1999 GM sourced
UNH Lamp Marker (roof Mounted) — Reference
UNJ Lamp Marker And Off Road (roof Mounted) — Reference
UNK C, PROVISIONS, ANTI-LOCK BRAKE WIRING HARNESS (ADDITIONAL 6 FT LENGTH) this code has more than one documented meaning — filter by year 1998 GM sourced
UNM Radio Am/fm Stereo, Seek/scan, Cd, Etr, Mp3/wma, Usb, Aux/in, Wireless — Reference
UNP P, LAMP, ROOF, OFF-ROAD, 10614 — Provisional
UNR P, LAMP, RADIATOR GRILLE GUARD, OFF-ROAD, 10614 — GM sourced
UNZ C, INDICATOR, TRANS OIL LEVEL LOCKING, 727 — GM sourced
UO9 HORN, FOUR NOTE — Provisional
UOW Side Bicyclist Alert 2026 GM sourced
UP0 P, RDO, M, RADIO, AM/FM STEREO, SEEK/SCAN, AUTO REV MUSIC SEARCH CASS, CD, AUTO TONE, CLOCK, ETR 1998 GM sourced
UP1 P, RDO, M, RADIO, AM/FM STEREO, AUTO SCAN CASS, CLOCK & CD, PROVISIONS, ETR 1998 GM sourced
UP2 P, RDO, M, RADIO, AM STEREO/FM STEREO, SEEK/SCAN, AUTO REV MUSIC SEARCH CASS, HPS, CLOCK, ETR, DSP 1994 GM sourced
UP3 P, RDO, M, RADIO, AM/FM STEREO, SEEK/SCAN, CD, CLOCK, EQLZR, ETR 1997 GM sourced
UP4 P, RDO, M, RADIO, AM, ETR this code has more than one documented meaning — filter by year 1984 GM sourced
UP5 P, RDO, M, RADIO, AM/FM STEREO, MCD, 928 E, 0 — GM sourced
UP6 P, RDO, M, RADIO, AM/FM STEREO, SEEK/SCAN, CASSETTE, EQUALIZER, CLOCK, COMPACT DISC PROVISIONS, ETR this code has more than one documented meaning — filter by year 1994 GM sourced
UP7 P, RDO, M, RADIO, PROVISIONS, MONO INSTRUMENTATION this code has more than one documented meaning — filter by year 1997 GM sourced
UP8 P, RDO, M, RADIO, PROVISIONS, AM/FM STEREO, INSTRUMENTATION this code has more than one documented meaning — filter by year 1997 GM sourced
UP9 P, RDO, M, RADIO, AM/FM STEREO, SEEK/SCAN, CD, CLOCK, EQLZR,, COMPACT DISC PROVISIONS, ETR this code has more than one documented meaning — filter by year 1997 GM sourced
UPC P, RECORDER, CONVENIENCE, RECALL this code has more than one documented meaning — filter by year 1999 GM sourced
UPE Wireless Interface Short Range, Sms — Reference
UPF Wireless Interface Short Range, Voice Rec — Reference
UPG Wireless Interface Short Range — Reference
UPH Wireless Interface Short Range, Voice Rec, Sms — Reference
UPI Wireless Interface Short Range, Voice Rec, Low Speed, Gmlan — Reference
UPJ Wireless Interface Short Range, Voice Rec, Sms, Embedded Phone — Reference
UPK Radio Am/fm Stereo, Seek/scan, Auto Rev Music Search Compact Disc, Mp3, Equalizer, Etr, S/din — Reference
UPL Gauge,filterminder Air Cleaner Restriction,direct Mounted — Reference
UPM P, GAGE, FILTERMINDER AIR CLNR RESTRICTION DASH MTD this code has more than one documented meaning — filter by year 1991 GM sourced
UPN C, PROVISIONS, GAGE FILTERMINDER AIR CLNR RESTRICTION DASH MTD 1996 GM sourced
UPP Radio Am/fm Stereo, Seek/scan, Auto Rev Music Search Cass, Cdc, Etr — Reference
UPQ Radio Am/fm Stereo, Seek/scan, Auto Rev Music Search Cass, Compact Disc, Cdc, Equalizer, Etr — Reference
UPR Radio Am/fm Stereo, Seek/scan, Auto Rev Music Search Cass, Compact Disc, Cdc, Mp3, Equalizer — Reference
UPS C, FLP, R, FLEET SALES, UNITED PARCEL this code has more than one documented meaning — filter by year 1992 GM sourced
UPT Radio Am/fm Stereo, Seek/scan, Auto Rev Music Search Cass, Cdc, Data System, Etr — Reference
UPU Radio Am/fm Stereo, Seek/scan, Auto Rev Music Search Cass, Cdc, Equalizer, Dsp, Etr — Reference
UPV Radio,am/fm Stereo,seek/scan,auto Rev Music Search Sass,compact Disc,cdc Equalizer,dsp,etr — Reference
UPW Radio,am/fm Stereo,seek/scan,auto Rev Music Search Cass,rds,etr — Reference
UPX Radio Am/fm Stereo, Seek/scan, Compact Disc, MP3 — Reference
UPY Radio Am/fm Stereo, Seek/scan, Auto Rev Music Search Cass, Multi Cd, Rds, Etr — Reference
UPZ Radio AM Stereo/fm Stereo, Seek/scan, Auto Rev Music Search Cass, Cdc, Equalizer, Etr — Reference
UQ0 P, SPR, M, SPEAKER SYSTEM, 4, DUAL FRT DR MTD, DUAL STD RGE QTR/SHELF this code has more than one documented meaning — filter by year 1987 GM sourced
UQ1 P, RDO, M, RADIO, PROVISIONS, AM/FM STEREO this code has more than one documented meaning — filter by year 1997 GM sourced
UQ2 P, SPR, M, SPEAKER SYSTEM, 6, DUAL F/D MIR PATCH TWT, DUAL F/D HSS, DUAL EXT RGE RR QUARTER this code has more than one documented meaning — filter by year 1991 GM sourced
UQ3 Audio system feature, 6-speaker system 2019 Reference
UQ4 P, SPR, M, SPEAKER SYSTEM, 4, BASE this code has more than one documented meaning — filter by year 1997 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.

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