Published October 31, 2026
Regular Production Option (RPO) codes for the C6 Chevrolet Corvette, 2005 to 2013. An RPO is General Motors’ three-character code for a factory option. This page keeps the codes people look up most often: engines, transmissions, axles, brakes, and the Z51, Z06, Grand Sport, and ZR1 packages. Year-by-year lists are linked below. Earlier generations are on the C4 RPO codes and C5 RPO codes pages. Later cars are on the C7 and C8 pages.
Codes below are taken from GM RPO lists and Heritage order-guide copies for 2005 to 2009, compiled at RPO Archive, and from the 2010 to 2013 service-parts lists on the year pages of this site. A code is listed for the years those sources actually show.
Engines
LS2 – Engine, gas, 8 cylinder, 6.0L, sequential fuel injection, aluminum. Base engine, 2005 to 2007.
LS3 – Engine, gas, 8 cylinder, 6.2L, sequential fuel injection, aluminum, high output. Base engine, 2008 to 2013.
LS7 – Engine, gas, 8 cylinder, 7.0L, sequential fuel injection, aluminum. Z06 engine, 2006 to 2013.
LS9 – Engine, gas, 8 cylinder, 6.2L, sequential fuel injection, aluminum, high output, intercooler, supercharged. ZR1 engine, 2009 to 2013.
Transmissions
M32 – Transmission, automatic 4-speed, 4L60-E, electronic, heavy duty. 2005.
MYC – Transmission, automatic 6-speed, 6L80. 2006 to 2013.
MM6 – Transmission, manual 6-speed, Tremec, 85 mm, 2.66 first, 0.50 sixth overdrive. 2005 to 2013.
MZ6 – Transmission, manual 6-speed, Tremec, 85 mm, 2.97 first, 0.57 sixth overdrive. The closer-ratio manual used with Z51. 2005 to 2013.
MN6 – Merchandised transmission, manual 6-speed provisions.
MX0 – Merchandised transmission, automatic overdrive provisions.
Related parts: automatic transmissions and manual transmissions.
Axles
GU2 – Axle, rear, 2.73 ratio. Included with the automatic in the 2005 order guide.
GU6 – Axle, rear, 3.42 ratio. Included with the manual, and standard on the 2006 Z06.
G90 – Axle, rear, 3.15 ratio. 2005 performance ratio, included with Z51 when the automatic was ordered.
GM8 – Axle, rear, 2.56 ratio. 2006 to 2009 GM lists.
See differentials.
Packages
Z51 – Performance package, handling. Not available with F55 on the 2005 order guide.
FE4 – Suspension system, special ride and handling. The Z06 suspension on the 2006 order guide. The Z06 itself is a model (LS7 and FE4), not a separate RPO on these lists.
F55 – Chassis, continuously variable real-time damping, magnetorheological. Magnetic Selective Ride Control. Not available with Z51 in 2005.
Z16 – Performance package, Grand Sport. 2010 to 2013 service-parts lists.
ZR1 – Performance package, special coupe. Printed on the 2012 service-parts list. The 2009 GM RPO list prints ZRI (letter I) rather than ZR1; the car is still the LS9 coupe.
Z07 – Z06 ultimate performance package. 2011 to 2013 service-parts lists.
CFZ – Carbon fiber package, Z06. 2011 to 2013 service-parts lists.
NPP – Exhaust system, performance. 2008 to 2013.
See also Corvette ZR1 packages.
Brakes
J55 – Brake system, heavy duty.
J56 – Brake system, power, front and rear disc, antilock, heavy duty. 2006 to 2013.
J57 – Brake system, power, front and rear disc, antilock, heavy duty, ceramic rotors. 2009 to 2013.
See disc brakes.
Seats
AQ9 – Seat, front bucket, luxury.
AR9 – Seat, front bucket, deluxe. Base bucket seat in the 2005 order guide.
Paint
10U – Primary color, exterior, Arctic White. 2005 order-guide color page.
41U – Primary color, exterior, Black. 2005 order-guide color page.
Later paint and interior codes change by year. Use the year list instead of guessing a code forward.
Year-by-year lists
2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013.
Sources
GM Chevrolet Corvette RPO code lists and GM Heritage order-guide copies for 2005 to 2009, as compiled by RPO Archive. Grand Sport (Z16), Z07, CFZ, and 2010 to 2013 continuation of LS3, LS7, LS9, MYC, and ZR1 are from the service-parts identification lists published on this site’s year pages, which match those GM descriptions.