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Home / DTC / U3572 — Stack Outlet Coolant Temperature Sensor 2 Circuit

U3572 — Stack Outlet Coolant Temperature Sensor 2 Circuit

Detailed page for trouble code U3572.

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Code

U3572

Generic U — Network/User

Stack Outlet Coolant Temperature Sensor 2 Circuit

Brand: Generic
Type: U — Network/User
Views: UK: 8 EN: 14 RU: 7
AI status
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Page language: EN

Causes

  • Open circuit (broken wire or disconnected connector) to the sensor
  • Short to ground or short to battery (power) in the signal or reference wire
  • Corroded, bent, or pushed-back terminal in the sensor connector
  • Failed coolant temperature sensor
  • High-resistance connection or poor ground
  • Water/contamination intrusion into connector or harness

Symptoms

  • MIL (Malfunction Indicator Lamp) illumination
  • Incorrect coolant temperature gauge or display reading
  • Cooling fan or HVAC behavior not operating correctly
  • Reduced engine performance or altered cold/warm idle control
  • Possible hard starting or extended warm-up time
  • Stored freeze-frame data showing out-of-range temperature values

What to check

  • Retrieve freeze frame and live data with a scan tool; note reported sensor voltage/temperature and any related codes
  • Visually inspect sensor connector and wiring for corrosion, damage, signs of water ingress, or pushed-out pins
  • Backprobe sensor connector to measure reference voltage, signal voltage, and ground continuity
  • Measure sensor resistance (with sensor disconnected) and compare to specification or expected trend (resistance changes with temperature)
  • Perform wiggle test on harness and connector while monitoring live data to find intermittent faults
  • Check for short to battery or ground with an ohmmeter (battery disconnected) between signal and power/ground

Signal parameters

  • Typical reference supply to sensor: ~5 V (vehicle dependent).
  • Typical signal voltage range: ~0.1–4.9 V (sensor output varies with temperature and type).
  • Open-circuit symptom: signal floats to supply voltage or scanner reports implausible/high voltage.
  • Short-to-ground symptom: signal near 0 V.
  • NTC-type sensor behavior: resistance decreases as temperature increases (exact ohms vary by sensor and vehicle).
  • Expect stable, smooth temperature readings when sensor and wiring are healthy; rapid jumps indicate intermittent or electrical faults.

Diagnostic algorithm

  1. Read and record stored codes and freeze-frame data with a scan tool. Note any other related codes.
  2. Visually inspect the Stack Outlet Coolant Temperature Sensor 2 connector and wiring for corrosion, damage, or contamination.
  3. With ignition ON (engine off), backprobe the connector and verify reference voltage at the sensor (compare to vehicle spec).
  4. Measure signal voltage while warming/cooling the engine; confirm reading changes smoothly. If signal is fixed low or high, suspect open/short.
  5. With sensor removed, measure its resistance at known temperatures and compare to specifications or expected NTC trend. Replace if out of range.
  6. Check continuity between sensor signal pin and control module pin (with battery disconnected). Check for short to power/ground.
  7. Perform a wiggle/stress test of the harness while monitoring live data to catch intermittent faults. Repair any chafed/pinched wiring.
  8. Repair connector/wiring or replace sensor as indicated (crimp/splice to OEM standards, use dielectric grease if appropriate).
  9. After repairs, clear codes, perform functional test and road/operating cycle to verify the fault does not return.
  10. If wiring and sensor pass and fault persists, evaluate control module inputs, grounds, and module software/updates; consult manufacturer service info before replacing module.

Likely causes

  • Disconnected or corroded sensor connector
  • Broken/shorted wiring between sensor and control module
  • Failed coolant temperature sensor (internal short/open)
  • High resistance at ground or reference circuit
  • Intermittent harness damage (chafing near steering or engine mount)

Fault status

⚠️ Status
Stack Outlet Coolant Temperature Sensor 2 circuit fault detected (open/short/high resistance/intermittent). Sensor reading invalid or out-of-range; control module may use default value or disable related control strategies.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0115 P0116 P0117 P0118 P0128 U0100
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