Cylinder unit, single key system, coded NU97

Years 2001–09, 2014, 2016, 2025–27 Models 16 Factory citations 53

Also described as Fleet calibration (SEO)Key, common, all keys coded alikeSingle-key lock cylinders, coded NU97 (SEO)Key, common, complete vehicle fleetCylinder unit, single key system, coded NU97 (SEO)Key, common fleet key code for door locks and ignition (SEO)Fleet calibration, single key code common to the door locks of all vehicles in the fleet (SEO)

Also documented for Cadillac GMC

Documented applications

Avalanche — GMT900 (2007–2013)

2007–2009 Factory-verified

GM factory document — 2007 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2008 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2009 chevrolet avalanche 2wd rpo code list, p.1.

Blazer EV (2024–2027)

2025–2027 Factory-verified internal

; only in: Police Package

GM factory document — 2025 chevrolet blazer ev police package fleet order guide rpo codes, p.1.
GM factory document — 2026 chevrolet blazer ev police package fleet order guide rpo codes, p.1.
GM factory document — 2027 chevrolet blazer ev police package fleet order guide rpo codes, p.1.

Impala — eighth generation (2000–2005)

2001–2005 Factory-verified

GM factory document — 2001 chevrolet impala rpo code list, p.1.
GM factory document — 2002 chevrolet impala rpo code list, p.1.
GM factory document — 2003 chevrolet impala rpo code list, p.1.
GM factory document — 2004 chevrolet impala rpo code list, p.1.
GM factory document — 2005 chevrolet impala rpo code list, p.1.
GM Heritage factory kit — 2001 Chevrolet Impala, p.35.
GM Heritage factory kit — 2005 Chevrolet Impala, p.26.

Impala — ninth generation (2006–2016)

2006–2009 Factory-verified

GM factory document — 2006 chevrolet impala rpo code list, p.1.
GM factory document — 2007 chevrolet impala rpo code list, p.1.
GM factory document — 2008 chevrolet impala rpo code list, p.1.
GM factory document — 2009 chevrolet impala rpo code list, p.1.

Monte Carlo — sixth generation (2000–2007)

2001–2007 Factory-verified

GM factory document — 2001 chevrolet monte carlo rpo code list, p.1.
GM factory document — 2002 chevrolet monte carlo rpo code list, p.1.
GM factory document — 2003 chevrolet monte carlo rpo code list, p.1.
GM factory document — 2004 chevrolet monte carlo rpo code list, p.1.
GM factory document — 2005 chevrolet monte carlo rpo code list, p.1.
GM factory document — 2006 chevrolet monte carlo rpo code list, p.1.
GM factory document — 2007 chevrolet monte carlo rpo code list, p.1.

Silverado 1500 — Fifth generation (2027)

2027 Factory-verified

fleet key code; all keys on the vehicle are coded to one key, as with AU7

GM factory document — 2027 chevrolet next generation silverado 1500 retail and fleet fleet order guide rpo codes, p.1.

Silverado — GMT800 (1999–2007)

2001 Factory-verified

GM factory document — 2001 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM Heritage factory kit — 2001 Chevrolet Silverado, p.60.

Silverado HD — GMT800 (2001–2007)

2001, 2002 Factory-verified

years from Heritage kit pages, not in GM’s service list of that year: 2002 (kit list)

GM factory document — 2001 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM Heritage factory kit — 2002 Chevrolet Silverado HD, p.45.

Silverado Medium Duty (GM515, 2019–2026)

2025–2026 Factory-verified

orderable; requires a Fleet or Government order; alternate to 6E2; not compatible with previous model years; the Silverado 1500 doc reads it "Key, common, all keys coded alike"

GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1.
GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1.
GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.123.
GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.120.

Silverado — T1XX (2019–2026)

2025–2026 Factory-verified

GM's list says not compatible with Tahoe or with prior-year Silverados equipped with SEO 6E8;

GM factory document — 2025 chevrolet silverado 1500 retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 chevrolet silverado 1500 retail and fleet fleet order guide rpo codes, p.1.

Suburban — GMT800 (2000–2006)

2001 Factory-verified

GM factory document — 2001 chevrolet chevy suburban 2wd rpo code list, p.1.

Suburban — GMT900 (2007–2014)

2007–2009 Factory-verified

GM factory document — 2007 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2008 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2009 chevrolet chevy suburban 2wd rpo code list, p.1.

Tahoe — GMT800 (2000–2006)

2001, 2003, 2006 Factory-verified

GM factory document — 2001 chevrolet tahoe 2wd rpo code list, p.1.
GM Heritage factory kit — 2003 Chevrolet Tahoe, p.153.
GM Heritage factory kit — 2006 Chevrolet Tahoe, p.154.

Tahoe — GMT900 (2007–2014)

2007–2009, 2014 Factory-verified

Trim marks in the 2014 guides: Police: O; Special Service: O.

GM factory document — 2007 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2008 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2009 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2014 chevrolet tahoe police vehicle fleet order guide wayback, p.2.
GM factory document — 2014 chevrolet tahoe special service vehicle fleet order guide wayback, p.2.
GM Heritage factory kit — 2007 Chevrolet Tahoe, p.181, p.184.

Tahoe — K2XX (2015–2020)

2016 Factory-verified

2016: Police Vehicle, Special Service: A; one key code for every vehicle of the fleet, the alternate to 6E2; not compatible with earlier model years

GM factory document — 2016 chevrolet tahoe police vehicle fleet order guide wayback, p.2.
GM factory document — 2016 chevrolet tahoe special service vehicle fleet order guide wayback, p.2.

Tahoe — T1XX (2021–2027)

2025–2027 Factory-verified internal

2027: police guides: O on both columns; alternate key code to 6E2; requires AMF and includes AU7; not compatible with previous model years

GM factory document — 2025 chevrolet new tahoe police package and special service fleet order guide, p.9.
GM factory document — 2026 chevrolet tahoe police package and special service fleet order guide, p.9.
GM factory document — 2027 chevrolet tahoe police package and special service fleet order guide, p.9.

This page aggregates every documented appearance of 6E8 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.