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Home / DTC / C1730 — Reference voltage out of range

C1730 — Reference voltage out of range

Detailed page for trouble code C1730.

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C1730

LAND ROVER C — Chassis

Reference voltage out of range

Brand: LAND ROVER
Type: C — Chassis
Views: UK: 8 EN: 6 RU: 8
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Page language: EN

Causes

  • Damaged or corroded sensor connector or wiring harness
  • Open circuit or short to power/ground on the reference supply circuit
  • Failed sensor drawing excessive current
  • Blown or faulty VREF/power fuse or fusible link
  • Poor battery voltage or weak charging system
  • Intermittent connection or water intrusion

Symptoms

  • ABS, Traction Control or Stability warning lamp illuminated
  • Loss or intermittent operation of ABS/traction/stability functions
  • Stored C1730 with possible additional related codes
  • Inconsistent or zero sensor readings for the affected sensor circuit
  • Vehicle may pass initial self-test then fail under driving conditions

What to check

  • Retrieve freeze-frame and full DTC list with a diagnostic scanner; note affected circuit or sensor index
  • Visually inspect sensor connector(s), wiring harness, and grounding points for corrosion, pin damage, or water ingress
  • Check battery voltage and charging system (should be ~12.4–14.6 V with engine running)
  • Check Vref fuse(s) and fusible links in power distribution
  • Back-probe the reference (Vref) terminal at the sensor connector with ignition ON (engine OFF) and measure voltage
  • Measure Vref at the control module connector to compare with sensor-end reading

Signal parameters

  • Typical reference voltage expected: approximately 5.0 V (acceptable range commonly ~4.5–5.5 V depending on manufacturer)
  • With ignition ON, engine OFF: Vref should be a steady DC voltage (no pulsing)
  • With sensor connected, sensor signal should be within specified amplitude and responsive to input (wheel speed, pressure, etc.)
  • Battery voltage: ~12.4–12.9 V (key on, engine off); charging ~13.5–14.6 V (engine running)

Diagnostic algorithm

  1. Step 1 — Confirm and document: Read DTCs and freeze-frame, note which sensor/circuit is referenced and whether multiple codes are present.
  2. Step 2 — Visual inspection: Inspect connectors, wiring, and grounds for corrosion, damage, or pin push-out. Repair any obvious defects.
  3. Step 3 — Power & ground checks: Verify battery and charging system. Check fuses and power feeds to the control module and replace any blown fuses.
  4. Step 4 — Measure Vref at sensor: Back-probe the reference pin at the sensor connector with ignition ON (engine OFF). Compare to expected ~5 V. If Vref is absent or low, trace back toward the module.
  5. Step 5 — Isolate sensor: Unplug the sensor and re-measure Vref. If Vref returns to normal when sensor is disconnected, the sensor is likely faulty or shorted.
  6. Step 6 — Wiring continuity: With power off, check continuity and resistance between sensor connector and module pin; check for shorts to ground or battery using an ohmmeter and powered voltage checks as appropriate.
  7. Step 7 — Replace or swap: If wiring is good and Vref still incorrect, replace suspect sensor. If problem persists, investigate or bench-test the control module Vref driver and repair or replace the module per manufacturer procedures.
  8. Step 8 — Verify: Clear codes, retest under driving conditions and re-scan to ensure C1730 does not return. Document repairs and retest for intermittent faults.

Likely causes

  • Loose/corroded Vref pin at sensor connector
  • Short to battery or ignition feed on the Vref wire
  • Open circuit between module and sensor
  • Failed wheel-speed/temperature/pressure sensor (depending on circuit)
  • Blown Vref fuse or faulty power distribution to the control module

Fault status

⚠️ Status
Reference voltage (Vref) to sensor circuit is outside the allowed range. Check sensor supply, wiring, fuses, grounds and control module for faults.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.0 hours

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C1731 C1735 C1110 C1140 U0100
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