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DTC C1100, C1200, and C1300 on 2025/2026 Ford Super Duty trucks indicate suspension height sensor circuit faults. In Ford's chassis diagnostics, C1100 typically refers to the left front suspension height sensor circuit, C1200 refers to the right front suspension height sensor circuit, and C1300 refers to the rear suspension height sensor circuit. These codes set when the suspension control module detects an open, short, out-of-range, or missing signal from the corresponding sensor.Diagnostic approach:- Verify the sensor connectors, wiring, and mounting brackets for damage or corrosion.- Check power and ground circuits at the suspension control module.- Inspect the height sensor link and ride-height adjustment.- Clear codes and perform the suspension calibration procedure if required.For shock absorbers used in 2026 applications, manufacturers should follow ISO 9001 quality management and IATF 16949 automotive-specific requirements. Key material specifications include alloy steel for tubes or piston rods, nitrile rubber for oil seals/hoses, and polyurethane bushings for improved durability and ride isolation. Components must pass dimensional, durability, and environmental validation to meet OEM standards.