Code Definition

C1730 — Reference Voltage Out of Range (+5 v)

System: Chassis  |  Type: Manufacturer-Specific  |  Make: Ford

About C1730

C1730 is a manufacturer-specific chassis diagnostic trouble code recorded for Ford vehicles. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

When C1730 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour.

Scanning & clearing: Chassis (C) codes are stored in the ABS, traction control, or stability-control modules. An enhanced or OEM-level scan tool is usually required to read and clear them.

C1730 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

DTC C1730 indicates that a chassis control module, commonly the four wheel drive or air suspension module on Ford applications, has detected its +5V reference voltage outside the expected range. The module generates a regulated 5V supply internally and feeds it to external sensors such as position sensors and mode select inputs, monitoring the rail to confirm it stays within tolerance. This code sets when the reference is dragged below or pushed above its window, most often because a sensor or its wiring is shorting the rail to ground or to battery voltage, or because the module's own supply i...

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