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C1730 Manufacturer-specific Basic entry

Reference Voltage Out of Range (+5 v)

Updated 2026-10-02 · Chassis (manufacturer-specific)

Severity
Medium
Typical repair cost
60 – 500 EUR
System
Chassis

This is a manufacturer-specific code. Its exact meaning can differ between makes; the definition below follows the most common usage.

What it means

C1730 is stored when the Reference Voltage Out of Range (+5 v) signal is electrically valid but does not make sense compared with other sensors or the expected operating range. The circuit is usually fine; the component or what it measures is out of specification.

This entry is compiled automatically from the standard definition and typical diagnostic practice for this type of fault. A detailed, reviewed article is in preparation.

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Symptoms

  • ABS, ESP or traction control warning light
  • Stability and traction systems disabled
  • Possible longer braking distance in emergency stops
  • Speedometer or cruise control affected in some vehicles

Common causes

  1. Reference Voltage Out of Range (+5 v) worn, contaminated or out of calibration
  2. Mechanical problem in the system the sensor measures
  3. Air, vacuum or exhaust leak influencing the reading
  4. Wrong or low-quality replacement part
  5. Wiring resistance causing a small voltage offset

How to diagnose

  1. Compare the live Reference Voltage Out of Range (+5 v) reading with a known-good value or a second sensor at idle and at 2500 rpm
  2. Check for air, vacuum or exhaust leaks that could skew the reading
  3. Inspect the component for contamination and clean it if the design allows
  4. Verify the part number is correct for the engine
  5. Replace the Reference Voltage Out of Range (+5 v) if the reading remains out of specification

Frequently asked questions

Can I keep driving with C1730?

Usually yes for a short time, but expect reduced performance or higher fuel use. Have it diagnosed within a few days.

Will clearing C1730 fix it?

No. Clearing only erases the stored code; it returns as soon as the monitor runs again unless the cause is repaired.

Related codes

C1728C1729C1731C1732

Nearby codes in this group