FMVSS No. 126 Electronic Stability Control (49 CFR 571.126)

What FMVSS No. 126 Electronic Stability Control (49 CFR 571.126) requires

FMVSS No. 126 (Section 571.126) requires Electronic Stability Control (ESC) systems on passenger cars, multipurpose passenger vehicles, trucks, and buses with a GVWR of 4,536 kg (10,000 lb) or less. Per S5.1.1 the ESC must apply brake torques individually to all four wheels under a control algorithm, and per S5.1.2 must be operational across all driving phases except below 20 km/h, in reverse, or during initialization. Stability is demonstrated against the yaw-rate criteria of S5.2 using the Sine with Dwell test in S7.9.

Pillar: Automotive & Mobility · Authority: NHTSA / US Department of Transportation · Version: 1.0.0 · Last updated: 2026-06-26

Primary source: https://www.ecfr.gov/api/renderer/v1/content/enhanced/current/title-49?part=571&section=571.126

SHA-256 integrity: 2834820a06b3d5e608e2dcf3af49dd22dac82694f60c3b0d14e67fcf276482de

Primary Citations — 7 traced to source

• 49 CFR 571.126 - Standard No. 126; Electronic stability control systems, § 571.126 S3 - Application (GVWR 4,536 kg or less)
• 49 CFR 571.126 - Standard No. 126; Electronic stability control systems, § 571.126 S5.1.1 - individual four-wheel brake torque control

+ 5 more citations (full bibliography, deterministic workflow, actionable schema and crosswalks) included in the vault unlock — $0.01 via Skyfire / L402 / Direct Base USDC.

Access

• Discovery (free): /api/v1/nodes/us-fmvss-126-electronic-stability-control.json — 6-field metadata
• Vault (full node): /api/v1/vault/nodes/us-fmvss-126-electronic-stability-control.json — full 13-key payload, $0.01 USDC (L402/Skyfire/Direct Base)
• Canonical URL: https://bidda.com/intelligence/us-fmvss-126-electronic-stability-control
• Back to registry: Browse all 10,090 compliance nodes