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Home / DTC / C173500 — Overtemperature Detected

C173500 — Overtemperature Detected

Detailed page for trouble code C173500.

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C173500

HYUNDAI C — Chassis

Overtemperature Detected

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

Causes

  • Actual overheating of a monitored component (ABS hydraulic unit, inverter, transmission, etc.)
  • Faulty or out-of-range temperature sensor (open, shorted, or drifted)
  • Damaged or corroded wiring or connector causing bad sensor readings
  • Blocked or failed cooling system (fan, cooler, fluid flow restriction)
  • Low or contaminated fluid causing poor heat dissipation
  • Internal control module overheating or internal sensor fault

Symptoms

  • Warning light or dash message indicating overtemperature or system fault
  • Reduced system functionality (ABS/ESC disabled, transmission derate, or inverter limp mode)
  • Unusual heat felt near affected component
  • Intermittent or permanent fault lamp illumination
  • Possible stored additional codes related to sensors, fans, or fluid level

What to check

  • Read all stored and pending codes and freeze frame data with a capable scan tool
  • Inspect the affected component area for heat damage, burnt insulation, or melted connectors
  • Check coolant/fluid level and condition for the system involved (brake fluid, transmission fluid, inverter coolant)
  • Verify operation of cooling fans and pumps related to the component
  • Visually inspect wiring harnesses and connectors for corrosion, loose pins, or chafing
  • Measure the temperature sensor circuit with a multimeter/scan tool (voltage, resistance) and compare to expected behavior

Signal parameters

  • Temperature sensor circuit type: typically thermistor (NTC/PTC) or semiconductor sensor; expect a voltage or resistance change as temperature changes
  • Common signal range: 0–5 V on sensor output circuits (varies by sensor type); verify with service manual
  • Resistance behavior: thermistor resistance changes with temperature (consult OEM chart for specific ohms/temp)
  • Module-reported temperature value available via CAN/live data — compare live reading to ambient and expected operating temp
  • Fault threshold: module flags overtemperature when measured value exceeds stored threshold (refer to factory spec for exact °C/F)

Diagnostic algorithm

  1. Use a diagnostic scanner to capture all DTCs, freeze frame, and live temperature data for the affected system.
  2. Note when the fault sets (idle, driving, after repeated braking, immediately on power-up) to help reproduce conditions.
  3. Visually inspect the affected component and surrounding area for signs of overheating, fluid leaks, or physical damage.
  4. Inspect and reseat connectors; check for corrosion or water intrusion at the sensor/module connector.
  5. Measure sensor circuit voltage and/or resistance at key temperatures (cold ambient and after brief operation) and compare to OEM specification.
  6. Verify operation of cooling devices (electric fans, pumps) and associated relays/fuses; test fan activation under conditions that should run it.
  7. Check fluid levels and condition; correct low or contaminated fluid and bleed system if required.
  8. If wiring and external components test good, compare module internal temperature reporting with an external infrared thermometer aimed at the component to confirm sensor accuracy.
  9. If sensor is out of spec or intermittent, replace sensor and retest. If sensor and wiring are good but module still reports high temp, consider control module internal fault and refer to manufacturer procedures for module replacement or repair.
  10. After repairs, clear codes and road-test under conditions that previously caused the fault to verify the repair; re-scan for new codes.

Likely causes

  • Temperature sensor failure or intermittent connection
  • Cooling fan or coolant/cooler failure for the affected component
  • Low fluid level or degraded fluid in the system being monitored
  • Wiring harness damage or poor ground near the sensor/module
  • Module internal fault causing false overtemperature reporting

Fault status

⚠️ Status
Overtemperature detected — system temperature exceeded allowed limit. Protective mode or reduced functionality may be active until temperature returns to safe range or fault is repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

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371

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