8S3 ✓ Factory-verified

GMC · Regular Production Option

Back-up alarm, 97 decibels

Years 2001–02, 2020, 2023, 2025–27 Models 8 Factory citations 26

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Also described as Alarm, backup, electrical, 97 decibels (SEO)Back-up alarm, electrical, 97 decibelsBack-up alarm, 97 dB (SEO)Alarm, back-up, electrical, 97 decibels (SEO)

Also documented for Chevrolet

Documented applications

Savana — GMT600 (1996–2002) →

• 2001–2002 ✓ Factory-verified
  ⛭ GM factory document — 2001 gmc savana rpo code list, p.1.

  ⛭ GM factory document — 2002 gmc savana rpo code list, p.1.

Savana — GMT610 (2003–2027) →

• 2023, 2025–2027 ✓ Factory-verified

  O: Cargo 1WT, Cutaway 1WT, Cutaway 2WT (2025–2026), Passenger 1LS, Passenger 1LT

  ⛭ GM factory document — 2023 chevrolet 23 express savana body builder sm en us 2022sep13, p.12.

  ⛭ GM factory document — 2025 gmc savana cargo fleet order guide, p.38.

  ⛭ GM factory document — 2025 gmc savana cutaway fleet order guide, p.45.

  ⛭ GM factory document — 2025 gmc savana passenger fleet order guide, p.29.

  ⛭ GM factory document — 2026 gmc savana cargo fleet order guide, p.40.

  ⛭ GM factory document — 2026 gmc savana cutaway fleet order guide, p.49.

  ⛭ GM factory document — 2026 gmc savana passenger fleet order guide, p.31.

  ⛭ GM factory document — 2027 gmc savana cargo fleet order guide, p.37.

  ⛭ GM factory document — 2027 gmc savana cutaway fleet order guide, p.26.

  ⛭ GM factory document — 2027 gmc savana passenger fleet order guide, p.29.

Sierra 1500 — Next-Generation (2027) →

• 2027 ✓ Factory-verified

  Pro, Elevation 3SB: O; Elevation 3VL, AT4, AT4X, Denali, Denali Ultimate: not offered

  ⛭ GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide, p.108.

  ⛭ GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

Sierra — GMT800 (1999–2007) →

• 2001 ✓ Factory-verified
  ⛭ GM factory document — 2001 gmc gmc c sierra 2wd rpo code list, p.1.

Sierra HD — GMT800 (2001–2007) →

• 2001 ✓ Factory-verified
  ⛭ GM factory document — 2001 gmc gmc c sierra 2wd rpo code list, p.1.

Sierra HD — T1XX (2020–2027) →

• 2025–2027 ✓ Factory-verified

  Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered

  ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.110.

  ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.105.

  ⛭ GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.99.

Sierra — T1XX (2019–2026) →

• 2020, 2025–2026 ✓ Factory-verified

  SEO

  ⛭ GM factory document — 2020 gmc 20 sierra 1500 electrical body buil 1, p.10.

  ⛭ GM factory document — 2025 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2026 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

Yukon — GMT800 (2000–2006) →

• 2001 ✓ Factory-verified
  ⛭ GM factory document — 2001 gmc yukon 2wd rpo code list, p.1.

Related codes · mentioned in these notes

1LS1LT1WT2WT3SB3VL

This page aggregates every documented appearance of 8S3 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.