JL4 Factory-verified

Chevrolet · Regular Production Option

Control, active brake

Years 1967, 1998–10, 2014–19, 2022–27 Models 19 Factory citations 82

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Also described as Dual brake system (gas models)Active brake controlStabiliTrak, stability control system with traction control

Also documented for Buick Cadillac GMC Hummer Oldsmobile Pontiac Saturn

Documented applications

1967 Single-source

Dual master cylinder, std later

Avalanche — GMT800 (2002–2006)

2003–2006 Factory-verified

GM factory document — 2003 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet avalanche 2wd rpo code list, p.1.
GM Heritage factory kit — 2005 Chevrolet Avalanche, p.33.

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.
GM Heritage factory kit — 2007 Chevrolet Avalanche, p.30.

City Express (2015–2018)

2015–2018 Factory-verified

GM factory document — 2015 chevrolet city express electrical body builders manual service manual 2015 en us, p.8.
GM factory document — 2017 chevrolet city express electrical body builders manual service manual 2017 en us, p.8.
GM factory document — 2018 chevrolet 18 city express bodybuilders sm 2 w cvr pg, p.10.

Cobalt — Delta (2005–2010)

2009 Factory-verified

GM factory document — 2009 chevrolet cobalt rpo code list, p.1.

Corvette — C5 (1997–2004)

1998–2002 Factory-verified

order guide name: active handling system (1999)

GM factory document — 1998 chevrolet corvette rpo code list, p.1.
GM factory document — 1999 chevrolet corvette rpo code list, p.1.
GM factory document — 2000 chevrolet corvette rpo code list, p.1.
GM factory document — 2001 chevrolet corvette rpo code list, p.1.
GM factory document — 2002 chevrolet corvette rpo code list, p.1.
GM Heritage factory kit — 1999 Chevrolet Corvette, p.18.

Express — GMT610 (2003–2027)

2006–2010, 2014–2018, 2022–2027 Factory-verified

the 2025–2027 guides read StabiliTrak, traction assistance and vehicle stability enhancement system; S: Cargo 1WT, Cutaway 1WT, Cutaway 2WT (2025–2026), Passenger 1LS, Passenger 1LT

GM factory document — 2006 chevrolet express rpo code list, p.1.
GM factory document — 2007 chevrolet express awd rpo code list, p.1.
GM factory document — 2008 chevrolet express rpo code list, p.1.
GM factory document — 2009 chevrolet express rpo code list, p.1.
GM factory document — 2010 chevrolet gh van elec 1 7 d1 100813, p.15.
GM factory document — 2014 chevrolet gh van elec bbm si brief, p.6.
GM factory document — 2015 chevrolet express savana electrical body builders manual service manual 2015 en us, p.13.
GM factory document — 2016 chevrolet express savana electrical body builders manual service manual 2016 en us, p.8.
GM factory document — 2017 chevrolet express savana electrical body builders manual service manual 2017 en us, p.8.
GM factory document — 2018 chevrolet 18 express savana bodybuilders sm 2017nov06, p.15.
GM factory document — 2022 chevrolet 22 express savana electrical body builder sm en us 2021oct12, p.13.
GM factory document — 2023 chevrolet 23 express savana body builder sm en us 2022sep13, p.14.
GM factory document — 2024 chevrolet 24 express savana body builder manual 18553161 2023oct26, p.14.
GM factory document — 2025 chevrolet my25 express savana electrical bbm, p.11.
GM factory document — 2025 chevrolet express cargo fleet order guide, p.4.
GM factory document — 2025 chevrolet express cutaway fleet order guide, p.6.
GM factory document — 2025 chevrolet express passenger fleet order guide, p.5.
GM factory document — 2026 chevrolet my26 express savana electrical bbm, p.11.
GM factory document — 2026 chevrolet express cargo fleet order guide, p.4.
GM factory document — 2026 chevrolet express cutaway fleet order guide, p.7.
GM factory document — 2026 chevrolet express passenger fleet order guide, p.5.
GM factory document — 2027 chevrolet express cargo fleet order guide, p.4.
GM factory document — 2027 chevrolet express cutaway fleet order guide, p.4.
GM factory document — 2027 chevrolet express passenger fleet order guide, p.5.

HHR (2006–2011)

2008–2009 Factory-verified

GM factory document — 2008 chevrolet hhr rpo code list, p.1.
GM factory document — 2009 chevrolet hhr rpo code list, p.1.

Impala — ninth generation (2006–2016)

2008–2009 Factory-verified

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

Silverado — GMT800 (1999–2007)

2004 Factory-verified

GM factory document — 2004 chevrolet chevy c silverado 2wd rpo code list, p.1.

Silverado — GMT900 (2007–2013)

2009 Factory-verified

GM factory document — 2009 chevrolet silverado 2wd rpo code list, p.1.

Silverado HD — GMT800 (2001–2007)

2004 Factory-verified

GM factory document — 2004 chevrolet chevy c silverado 2wd rpo code list, p.1.

Silverado HD — GMT900 (2007–2014)

2009 Factory-verified

GM factory document — 2009 chevrolet silverado 2wd rpo code list, p.1.

Suburban — GMT800 (2000–2006)

2003–2006 Factory-verified

GM factory document — 2003 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet chevy suburban 2wd rpo code list, p.1.
GM Heritage factory kit — 2003 Chevrolet Suburban, p.38.
GM Heritage factory kit — 2004 Chevrolet Suburban, p.41.

Suburban — GMT900 (2007–2014)

2007–2009, 2014 Factory-verified

The 2014 guide words it as StabiliTrak, stability control system with traction control. Trim marks in the 2014 guide: LS, LT, LTZ: S.

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.
GM factory document — 2014 chevrolet suburban fleet order guide wayback, p.4.
GM Heritage factory kit — 2007 Chevrolet Suburban, p.150, p.175.

Tahoe — GMT800 (2000–2006)

2003–2006 Factory-verified

GM factory document — 2003 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet tahoe 2wd rpo code list, p.1.
GM Heritage factory kit — 2003 Chevrolet Tahoe, p.31.
GM Heritage factory kit — 2005 Chevrolet Tahoe, p.136.
GM Heritage factory kit — 2006 Chevrolet Tahoe, p.27.

Tahoe — GMT900 (2007–2014)

2007–2009, 2014 Factory-verified

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

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.4.
GM factory document — 2014 chevrolet tahoe special service vehicle fleet order guide wayback, p.4.
GM Heritage factory kit — 2007 Chevrolet Tahoe, p.132, p.142.

Trax — first US generation (2015–2022)

2016, 2018–2019 Factory-verified

all trims: S

GM factory document — 2016 chevrolet trax fleet order guide wayback, p.4.
GM factory document — 2018 chevrolet trax order guide copy gm authority, p.23.
GM factory document — 2019 chevrolet trax order guide copy gm authority, p.23.

Uplander (2005–2008)

2005–2008 Factory-verified

GM factory document — 2005 chevrolet uplander rpo code list, p.1.
GM factory document — 2006 chevrolet uplander rpo code list, p.1.
GM factory document — 2007 chevrolet uplander rpo code list, p.1.
GM factory document — 2008 chevrolet uplander rpo code list, p.1.

This page aggregates every documented appearance of JL4 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.