← All owner tools · Decode your own SPID label with the GM RPO decoder
| 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 751 codes beginning with K. One meaning shown per code — the best-sourced one we hold. Search above for the rest.
| Code | Meaning | Years | Sourcing |
|---|---|---|---|
| K01 | P, FAN, CLUTCH DRIVE, ON/OFF this code has more than one documented meaning — filter by year | 1985 | GM sourced |
| K02 | P, FAN, RADIATOR BOOSTER this code has more than one documented meaning — filter by year | 1994 | GM sourced |
| K03 | P, EBH, R, HEATER ENG, BLOCK, 110V, 111 E, 0 | — | GM sourced |
| K05 | Engine block heater | 2026 | GM sourced |
| K06 | 2012-2013 Oem Engine Physical ID K06 & Production Number 12638502 this code has more than one documented meaning — filter by year | — | Reference |
| K07 | P, HEATER, RADIATOR, COOLANT, FUEL FIRED, TIMER, 530 E, 0 this code has more than one documented meaning — filter by year | — | GM sourced |
| K08 | Heater Auxiliary, Fuel Fired | — | Reference |
| K09 | P, GEN, M, GENERATOR, 120 AMP | 1984 | GM sourced |
| K0U | Primary Color Exterior, Silver | — | Reference |
| K10 | P, NPC, M, CONVERSION NAME PLT, "PRESTIGE", 1220 E, 5 | — | GM sourced |
| K11 | P, FLO, R, FILTER, AIR, COWL MOUNTED | 1993 | GM sourced |
| K12 | P, FLO, R, FILTER, AIR, POLLUTANT | 1996 | GM sourced |
| K13 | P, FLO, R, FILTER, EXHAUST SYSTEM, PARTICLE, 20802 E, 0 | — | GM sourced |
| K14 | P, FLO, R, FILTER, AIR, AUTO RECIRCULATING, 922 E, 4 | — | GM sourced |
| K15 | Filter,air,pollutant,dust,hvac Module | — | Reference |
| K16 | P, ACP, R, AIR COMPRESSOR, ELECTRIC, ACCESSORIES this code has more than one documented meaning — filter by year | 1999 | GM sourced |
| K17 | P, RAS, R, REACTOR SYSTEM, AIR INJECTION, ELECTRIC, 8 POINT | 1997 | GM sourced |
| K18 | P, RAS, R, REACTOR SYSTEM, AIR INJECTION, ELECTRIC this code has more than one documented meaning — filter by year | 1994 | GM sourced |
| K19 | P, RAS, R, REACTOR SYSTEM, AIR INJECTION this code has more than one documented meaning — filter by year | 1983 | GM sourced |
| K1A | P, COVERING, FLOOR MAT SET - OLYMPUS, 1030 | — | Provisional |
| K1B | P, ORNAMENTATION, EMBLEM, TRIM LEVEL - DELETE | 1998 | GM sourced |
| K1C | P, BDS, M BODY EQUIPMENT, 'AA' CREW CAB/REAR BODY | 1999 | GM sourced |
| K1D | P, BDS, M BODY EQUIPMENT, PICK-UP BOX - DELETE | 1999 | GM sourced |
| K1E | P, LACE, DOOR, ANTI-NOISE, W/SEAL | 1999 | GM sourced |
| K1F | P, NPC, M CONVERSION NAME PLT, - DELETE, 808 | — | Provisional |
| K1G | P, PROTECTOR, WHEEL ARCH LOWER - COLOR, 1030 | — | Provisional |
| K1H | P, PROTECTOR, RR DR LOWER - COLOR, 1030 | — | Provisional |
| K1J | P, ORNAMENTATION, NAMEPLATE 'BARBOUR', 10509 | — | Provisional |
| K1K | P, COVERING, FLOOR MAT SET - BARBOUR, 10503 | — | Provisional |
| K1L | P, CONVERSION, VIVARO DOUBLE CAB, 10807 | — | Provisional |
| K1M | P, GPK, R WINDOW PKG, COMPLETE BODY, WITH LH & RH SIDE RR DR, 11005 | — | Provisional |
| K1N | P, SGS, R SEO VEHICLE, HOBBY VEHICLE CONVERSION, 20522 | — | Provisional |
| K1O | Engine air filtration monitor | 2026 | GM sourced |
| K1P | P, ORNAMENTATION, EMBLEM - OPEL - REAR, 20918 | — | Provisional |
| K1X | P, ORNAMENTATION, BADGE - GVW - DELETE, 20918 | — | Provisional |
| K20 | P, MODULE, ELECTRONIC CONTROL this code has more than one documented meaning — filter by year | 1986 | GM sourced |
| K21 | P, MODULE, ELECTRONIC CONTROL VAR 1 | 1998 | GM sourced |
| K22 | P, GEN, M GENERATOR, 94 AMP | 1984 | GM sourced |
| K23 | P, CHARGER, FLOOR, OFFBOARD this code has more than one documented meaning — filter by year | 1992 | GM sourced |
| K24 | P, CHARGER, WALL, OFFBOARD this code has more than one documented meaning — filter by year | 1992 | GM sourced |
| K25 | P, CHARGER, CONVENIENCE this code has more than one documented meaning — filter by year | 1995 | GM sourced |
| K26 | Generator 40 Amp | — | Reference |
| K28 | P, FILTER FUEL | 1991 | GM sourced |
| K29 | P, MODULE, POWERTRAIN CONTROL this code has more than one documented meaning — filter by year | 1992 | GM sourced |
| K2A | P, SPP, R PACKAGE, FRONTERA 'LEVEL 0' | 1999 | GM sourced |
| K2B | P, SPP, R PACKAGE, FRONTERA 'LEVEL 1' | 1999 | GM sourced |
| K2C | P, SPP, R PACKAGE, FRONTERA 'OFF ROAD', 10202 | — | Provisional |
| K2D | P, SPP, R PACKAGE, FRONTERA 'CITY', 10202 | — | Provisional |
| K2Y | Conversion Name Plt 'sri V' | — | Reference |
| K30 | P, CRUISE CONTROL, AUTOMATIC this code has more than one documented meaning — filter by year | 1983 | GM sourced |
| K31 | P, HAT, R THROTTLE CONTROL, MANUAL this code has more than one documented meaning — filter by year | 1991 | GM sourced |
| K32 | Generator, 95 Ampere | — | Reference |
| K34 | Cruise control | 2026 | GM sourced |
| K35 | Module Electronic Control, High Alt | — | Reference |
| K36 | Module Electronic Control, Low Volatility Fuel | — | Reference |
| K39 | P, CRUISE CONTROL, AUTOMATIC - DELETE | 1999 | GM sourced |
| K3K | Battery Lbn1, Flooded Lead Acid, 12v, 50ah, 375 Cca | — | Reference |
| K3L | Battery Lbn2, Flooded Lead Acid, 12v, 60ah, 438 Cca | — | Reference |
| K3N | Battery Lbn3, Flooded Lead Acid, 12v, 70ah, 512 Cca | — | Reference |
| K3S | Battery Lbn4, Flooded Lead Acid, 12v, 75ah, 720 Cca | — | Reference |
| K3U | Battery Lbn5, Flooded Lead Acid, 12v, 85ah, 800 Cca | — | Reference |
| K3W | Battery | 2026 | GM sourced |
| K40 | Exhaust brake this code has more than one documented meaning — filter by year | 2026 | GM sourced |
| K41 | P, PROVISIONS, ENGINE BRAKE, EXHAUST | 1992 | GM sourced |
| K42 | P, ACL, M AIR CLEANER, "OFF ROAD" PACKAGE this code has more than one documented meaning — filter by year | 1998 | GM sourced |
| K43 | P, GEN, M GENERATOR, 102 AMP | 1997 | GM sourced |
| K44 | P, GEN, M GENERATOR, 90 AMP | 1984 | Provisional |
| K45 | P, ACL, M AIR CLEANER, HEAVY DUTY this code has more than one documented meaning — filter by year | 1983 | GM sourced |
| K46 | P, ACL, M AIR CLEANER, HEAVY DUTY, PRE-CLEANER this code has more than one documented meaning — filter by year | 1983 | GM sourced |
| K47 | Air filter, heavy-duty | 2026 | GM sourced |
| K48 | P, EQUIPMENT, PACKAGE, EXTREME DUST | 1997 | GM sourced |
| K49 | P, EQUIPMENT, PACKAGE, WATER | 1999 | Provisional |
| K4B | Battery, auxiliary, isolated, 730 CCA | 2019 | Reference |
| K4C | Wireless Charging | 2026 | GM sourced |
| K4E | Battery Ln3, Agm, 12v, 70ah, 760 Encca | — | Reference |
| K4F | Battery, 730 cold-cranking amps | 2026 | GM sourced |
| K4L | Battery Lbn3, Fla, 12v, 60ah, 550 Encca | — | Reference |
| K4M | Battery Lbn3, Fla, 12v, 80ah, 670 Encca | — | Reference |
| K4Q | Battery Ln3, Agm, 12v, 70ah, 761 Encca | — | Reference |
| K4R | Battery Ln4, Agm, 12v, 80ah, 801 Encca | — | Reference |
| K4S | Battery Ln3, Fla, 12v, 70ah, 450 Encca, Aux | — | Reference |
| K4T | Battery Ln3, Fla, 12v, 80ah, 660 Sae Cca | — | Reference |
| K4V | Battery Ln2, Fla, 12v, 55ah, 460 Cca | — | Reference |
| K4W | Battery Ln4, Fla, 12v, 80ah, 700 Cca | — | Reference |
| K4Z | Battery, auxiliary, 700 cold-cranking amps/70 Amp-hr | 2026 | GM sourced |
| K50 | P, FUEL, FITTING, LINE TAKE-OFF this code has more than one documented meaning — filter by year | 1995 | GM sourced |
| K51 | P, SPK, M KEY, IGNITION, W/O EMBLEM, 20703 E 0 | — | Provisional |
| K52 | P, FLD, R FUEL SENDER, HIGH TEMP | 1997 | GM sourced |
| K53 | Performance Air Intake System this code has more than one documented meaning — filter by year | 2026 | GM sourced |
| K54 | P, SPP, R PACKAGE, FUEL ECONOMY | 1994 | Provisional |
| K55 | P, FLD, R FUEL SENDER, LOW LUBRICITY this code has more than one documented meaning — filter by year | 1997 | GM sourced |
| K56 | P, EQUIPMENT, PACKAGE, SAND | 1999 | Provisional |
| K59 | P, CRUISE CONTROL, AUTOMATIC, ADAPTIVE | 1995 | GM sourced |
| K5K | Battery Ln4, Fla, 12v, 85 Ah, 750 Encca | — | Reference |
| K5L | Equipment Enhanced Cooling Package | — | Reference |
| K5M | Battery 90 12v 60ah 550 Sae Cca | — | Reference |
| K5N | Battery, Fla, 12v, 80ah, 750 Sae Cca | — | Reference |
| K5S | Battery, Agm, 12v, 70ah, 760 Encca, Aux | — | Reference |
| K5T | Battery Ln3, Fla, 12v, 80ah, 660 Sae, Dual | — | Reference |
| K5W | Battery, Agm, 12v, 50ah, 520encca | — | 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.