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Home / DTC / P0941 — Hydraulic Oil Temperature Sensor Circuit Intermittent

P0941 — Hydraulic Oil Temperature Sensor Circuit Intermittent

Detailed page for trouble code P0941.

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P0941

Generic P — Powertrain

Hydraulic Oil Temperature Sensor Circuit Intermittent

Brand: Generic
Type: P — Powertrain
Views: UK: 19 EN: 15 RU: 16
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Page language: EN

Causes

  • Intermittent/open/shorted wiring or connector in the sensor circuit
  • Corroded or loose sensor connector or pins
  • Failing or intermittent hydraulic oil temperature sensor (thermistor)
  • Poor ground or power supply to the sensor circuit
  • Water intrusion or contamination at connector
  • Intermittent controller (ECM/TCM) input or internal fault

Symptoms

  • Malfunction Indicator Lamp (MIL) or transmission warning lamp illuminated intermittently
  • Erratic hydraulic oil temperature gauge or display readout fluctuating
  • Intermittent transmission shift quality issues or limp mode (if controller relies on temp input)
  • Stored intermittent DTC with occasional clear or non-reproducible occurrence
  • Possible hard or harsh shifts when the fault is present

What to check

  • Retrieve freeze frame and full DTC history with a scan tool; note operating conditions when code set
  • Visually inspect sensor, connector, and harness for damage, corrosion, contamination or water entry
  • Wiggle test harness and connector while monitoring live temperature sensor data for dropouts
  • Backprobe sensor connector and measure reference voltage, signal voltage, and ground continuity
  • Measure sensor resistance across terminals at known oil temperatures (cold and warm) and compare to expected behavior
  • Check for good ground at sensor and at the controller (voltage drop test)

Signal parameters

  • Typical signal type: thermistor (resistance varies with temperature) producing a variable voltage to controller
  • Approximate voltage range: ~0.5–4.5 V depending on oil temperature and sensor design (manufacturer-specific)
  • Typical resistance behavior: decreases as temperature increases (example: ~2–10 kΩ at ~20°C; ~200–1,000 Ω at operating temps ~80–100°C)—refer to vehicle spec
  • Open-circuit: signal voltage usually near reference supply (high) or out-of-range; short to ground: signal near 0–0.2 V
  • Intermittent faults often show signal jumping, spiking, or dropping out on live data

Diagnostic algorithm

  1. Read and record DTC(s), freeze frame, and live hydraulic oil temperature data with a scan tool. Note frequency and conditions of occurrence.
  2. Visually inspect the sensor, harness, and connector for damage, corrosion, water, or loose pins. Repair obvious damage.
  3. With ignition on (engine off, per service manual), backprobe sensor connector: verify reference voltage (if used), signal voltage behavior, and ground continuity to controller. Wiggle harness and watch for intermittent changes.
  4. Measure sensor resistance at known temperatures (cold start and after warming). Confirm resistance changes smoothly with temperature (no sudden jumps). Compare to manufacturer spec if available.
  5. Perform voltage drop tests on ground and power circuits to ensure good connections. Repair or clean grounds and power splices as needed.
  6. If wiring/connector repairs are made, clear codes and road test to verify the issue stays cleared. Monitor live data for stability.
  7. If wiring and connectors are good but intermittent continues, replace the hydraulic oil temperature sensor and retest.
  8. If problem persists after sensor replacement, suspect intermittent controller input. Verify with wiring continuity to the controller and consider controller diagnostics or replacement per manufacturer guidance.
  9. After repair, erase codes and confirm no return of P0941 and that system behavior is normal across operating conditions.

Likely causes

  • Damaged or chafed wiring where harness flexes (shorts to ground or intermittent open)
  • Corrosion or bent pins at the sensor connector allowing intermittent contact
  • Sensor element degraded and producing unstable resistance with temperature
  • Loose or intermittent ground or fused power feed to sensor
  • Poor repair or aftermarket connector previously installed
  • Intermittent controller input—less common but possible

Fault status

⚠️ Status
Hydraulic Oil Temperature Sensor Circuit Intermittent — intermittent or unstable signal detected from the hydraulic oil temperature sensor circuit.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

P0115 P0116 P0117 P0118 P0125 P0940
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