Power Steering (variant/order-guide code)

Years 1972, 2025–26 Models 2 Factory citations 2

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Also described as Emissions, 50 state certification

Documented applications

Corvette (C3)

1972 Single-source

$0.00; count n/a (CAC only)

Silverado Medium Duty (GM515, 2019–2026)

2025–2026 Factory-verified internal

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.

This page aggregates every documented appearance of N4C in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.