KNR ✓ Factory-verified

Cadillac · Regular Production Option

Cooler, rear differential

Years 2007–09, 2025–26 Models 3 Factory citations 8

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Also described as Cooling system, axle

Also documented for Chevrolet

Documented applications

CT4 — Alpha 2 (2020–2026) →

• 2025–2026 ✓ Factory-verified

  only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: S

  ⛭ GM factory document — 2025 cadillac ct4 v ct4 v blackwing fleet order guide, p.7.

  ⛭ GM factory document — 2026 cadillac ct4 v ct4 v blackwing fleet order guide, p.8.

CT5 — Alpha 2 (2020–2026) →

• 2025–2026 ✓ Factory-verified

  only in: CT5-V, CT5-V Blackwing; V-Series: not available; V-Series Blackwing: S

  ⛭ GM factory document — 2025 cadillac ct5 v ct5 v blackwing fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2026 cadillac ct5 v ct5 v blackwing fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2025 cadillac ct5 v ct5 v blackwing fleet order guide, p.8.

  ⛭ GM factory document — 2026 cadillac ct5 v ct5 v blackwing fleet order guide, p.9.

STS — Sigma (2005–2011) →

• 2007–2009 ✓ Factory-verified
  ⛭ GM factory document — 2007 cadillac sts rpo code list, p.1.

  ⛭ GM factory document — 2009 cadillac sts rpo code list, p.1.

Related codes · mentioned in these notes

CT5SV

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