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Home / DTC / C173300 — Undervoltage Detected

C173300 — Undervoltage Detected

Detailed page for trouble code C173300.

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C173300

HYUNDAI C — Chassis

Undervoltage Detected

Brand: HYUNDAI
Type: C — Chassis
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Page language: EN

Causes

  • Weak or discharged battery
  • Poor battery terminal connections or corrosion
  • Faulty or slipping alternator / poor charging output
  • Blown fuse or faulty fusible link for the affected module
  • Damaged wiring harness, open/short to ground on supply or ground circuit
  • High-resistance ground(s) at the control module

Symptoms

  • ABS/ESC/TCS warning lamp illuminated
  • Other dashboard lamps (battery/charging system, check engine) may be on
  • Intermittent or complete loss of ABS/traction control functionality
  • Dimming lights or electrical oddities at idle
  • Hard starting, stalling, or no-crank/no-start conditions in severe cases
  • Stored communication errors or related codes

What to check

  • Read and record all stored codes and freeze-frame data with a scan tool
  • Measure battery resting voltage (vehicle off) and voltage while cranking
  • Measure charging system voltage with engine running at ~2,000 rpm
  • Inspect battery terminals, cable ends, and main engine/chassis grounds for corrosion or looseness
  • Check relevant fuses and fusible links for the affected module
  • Perform a battery load test or capacity test if battery voltage is low

Signal parameters

  • Battery resting voltage: ~12.4–12.7 V (healthy),
  • Cranking voltage: ideally >9.6–10.0 V under load (varies by vehicle)
  • Charging voltage (engine running): ~13.5–14.8 V
  • Module supply pin voltage: should track battery/charging voltage within ~0.5 V
  • Module ground resistance: near 0 ohms to chassis (low milliohm range)
  • CAN bus idle voltages (if applicable): CAN_H ~2.5–3.5 V, CAN_L ~1.5–2.5 V

Diagnostic algorithm

  1. Confirm code and note conditions (engine off, cranking, running) from freeze-frame and live data.
  2. Visually inspect battery, terminals, and main grounds. Clean and tighten battery connections.
  3. Measure and record battery voltage: key off, during cranking, and with engine idling. Compare to expected values.
  4. Load-test the battery if resting voltage low or if cranking voltage dips excessively.
  5. With engine running, measure alternator output at battery positive: 13.5–14.8 V expected. If low, test/repair charging system.
  6. Check fuses/fusible links for the affected module supply and replace if blown. Inspect related relay(s).
  7. Inspect harness and connector at the affected control module for corrosion, bent pins, or water ingress. Repair or replace damaged wiring.
  8. Verify module supply pin voltage and ground integrity at the module connector while monitoring for voltage drops during accessory loads or cranking.
  9. Clear codes and reproduce driving/starting conditions that originally set the code. Use wiggle tests and monitor live voltages to catch intermittent faults.
  10. If supply and wiring check good but undervoltage persists only at module, consider module internal fault and consult manufacturer procedures before replacing.

Likely causes

  • Low battery state of charge or bad battery
  • Loose/corroded battery terminals or poor main ground
  • Weak/failed alternator or poor charge circuit
  • Faulty connector or wiring to the affected control module

Fault status

⚠️ Status
Undervoltage detected on the control module supply circuit. The module detected supply voltage below its operating threshold. Verify battery, charging system, supply wiring and grounds before replacing the module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

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