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Home / DTC / U3570 — Stack Inlet Coolant Temperature Sensor Circuit

U3570 — Stack Inlet Coolant Temperature Sensor Circuit

Detailed page for trouble code U3570.

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U3570

Generic U — Network/User

Stack Inlet Coolant Temperature Sensor Circuit

Brand: Generic
Type: U — Network/User
Views: UK: 21 EN: 29 RU: 13
AI status
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Page language: EN

Causes

  • Open, shorted or corroded wiring between sensor and controller
  • Faulty stack inlet coolant temperature sensor (NTC/thermistor or temperature sender)
  • Poor or intermittent connector pins, water intrusion, or damaged sensor harness
  • Failed or intermittent ground or reference voltage at sensor
  • ECU/controller input fault or internal module failure
  • CAN/LIN/vehicle network communication errors or module lost communication

Symptoms

  • Stored U3570 diagnostic trouble code and related network codes
  • Inaccurate or frozen coolant temperature display in live data
  • Cooling system control abnormalities (fan, pumps) or reduced performance mode
  • Instrument cluster warnings or Service/Check Engine light
  • Possible limp or reduced-power mode if temperature reading affects system protection

What to check

  • Read and record freeze frame and related DTCs with a capable scan tool
  • Visually inspect sensor, connector, and wiring for damage, corrosion, or loose pins
  • Check for signs of coolant contamination or sensor housing damage
  • Verify sensor connector has proper sealing and is fully engaged
  • Measure reference voltage and ground at sensor connector with ignition on
  • Measure sensor output voltage or resistance across temperature range

Signal parameters

  • Typical temperature sensor output: analog voltage or resistance (common ranges: 0.1–4.9 V or thermistor resistance depending on design)
  • Expected operating voltage reference: usually ignition-switched 5 V or pull-up to controller (verify vehicle-specific)
  • Resistance vs temperature: thermistor-based sensors decrease or increase resistance with temperature (consult vehicle spec)
  • CAN/LIN message interval: sensor or module broadcasts at defined rate (e.g., 10–100 Hz depending on system)
  • Valid temperature range: sensor should report within expected ambient/engine coolant range (e.g., -40 °C to 125 °C — verify manufacturer specs)

Diagnostic algorithm

  1. Use a factory-level or good aftermarket scan tool to read U3570 and any related codes; record freeze-frame data and live values for the stack inlet coolant temp.
  2. Inspect the sensor and harness visually for damage, corrosion, rodent chew, pin push-out or coolant leaks. Repair or replace damaged parts before further testing.
  3. With connector disconnected, check sensor wiring continuity to the control module pins. Verify no short to battery or ground.
  4. With ignition on (engine off) measure reference voltage and ground at the sensor connector. Compare to specification; note any missing reference or poor ground.
  5. Measure the sensor output: either resistance across sensor terminals (cold vs warmed by hand) or voltage with connector connected while monitoring live data. Compare readings to expected values or a known-good sensor.
  6. Perform a wiggle/stress test on harness and connectors while monitoring live data for intermittent faults.
  7. If sensor wiring and signals are good, check CAN/LIN network health: ensure proper bus voltages, termination, and that related modules are communicating. Scan for additional U-codes (lost communication, invalid data).
  8. If wiring and network are OK, swap in a known-good sensor (if available) or replace the sensor, then clear codes.
  9. After repair, perform road or functional test to confirm correct temperature reporting and that the code does not return. Re-scan for lingering network or module errors.
  10. If code returns and wiring/network are confirmed good, consider ECU/controller input circuit testing or module reprogramming/repair per manufacturer procedures.

Likely causes

  • Connector corrosion or broken wire at harness near sensor
  • Sensor element out of specification (open/shorted thermistor)
  • Damaged insulation or chafed wiring causing intermittent short to ground/power
  • Missing sensor reference voltage or ground at ECU
  • Module lost communication on vehicle network or invalid data message

Fault status

⚠️ Status
U3570 — Stack Inlet Coolant Temperature Sensor Circuit: sensor signal missing, out-of-range, or invalid; check sensor, wiring, and communication.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours
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