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Home / DTC / B1389 — Oil temperature sensor

B1389 — Oil temperature sensor

Detailed page for trouble code B1389.

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Code

B1389

ALFA ROMEO B — Body

Oil temperature sensor

Brand: ALFA ROMEO
Type: B — Body
Views: UK: 3 EN: 7 RU: 3
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or failed oil temperature sensor
  • Wiring open, short to ground or short to voltage in sensor circuit
  • Corroded, loose or contaminated connector
  • Poor ground or supply voltage to the sensor
  • Incorrect sensor installed or out-of-spec replacement
  • Intermittent fault caused by chafing or vibration

Symptoms

  • Check Engine light or instrument cluster warning active
  • Incorrect oil temperature reading on dash or no reading
  • Cold-start enrichment or fuel trim issues (if ECU uses oil temp)
  • Poor idle, rough running or unexpected engine behavior when oil temperature is used by control strategies
  • Intermittent faults or hard-to-reproduce warnings

What to check

  • Scan for stored freeze frame data and live oil temperature sensor readings with a diagnostic scan tool
  • Visually inspect sensor, connector and harness for damage, corrosion, oil contamination and secure fit
  • Back-probe sensor connector and check supply voltage and ground
  • Measure sensor resistance (with engine cold) and compare to expected resistance vs temperature curve
  • Wiggle harness and connector while monitoring live data to reproduce fault
  • Check for related codes (power/ground or communication faults)

Signal parameters

  • Typical oil temperature sensor type: NTC thermistor (resistance decreases as temperature increases)
  • Nominal resistance examples (typical ranges, manufacturer-specific values vary): ~20–40 kΩ at -40°C, ~8–12 kΩ at 25°C, ~1–3 kΩ at 100°C
  • Typical sensor signal voltage to ECU: approx. 0.2–4.8 V depending on temperature and circuit (varies by vehicle)
  • Supply/reference voltage to sensor circuit: commonly 5 V reference from ECU (verify with wiring diagram)

Diagnostic algorithm

  1. Retrieve and record freeze frame and live data for oil temperature. Note sensor behavior at ambient temperature and during warm-up.
  2. Visually inspect sensor, connector and harness for oil contamination, bent pins, corrosion, broken wires, chafing or heat damage.
  3. With ignition ON (engine off), check reference voltage at the sensor connector; verify proper ground. Record values.
  4. Measure sensor resistance at ambient temperature and compare to manufacturer specification or a typical NTC curve. If resistance is out of expected range, replace sensor.
  5. If resistance is correct, back-probe sensor signal while warming engine and observe voltage/resistance change. If signal does not change smoothly with temperature, suspect wiring, connector or ECU input.
  6. Perform continuity and insulation tests on harness between sensor and ECU. Repair any opens or shorts; repair corroded connectors or pins.
  7. After repairs or sensor replacement, clear codes and perform a road or warm-up test while monitoring live oil temperature to confirm correct operation and that code does not return.
  8. If wiring and sensor check good but fault persists, consult wiring diagrams and consider ECU input circuit testing or replacement by qualified technician.

Likely causes

  • Failed oil temperature sensor (NTC/thermistor)
  • Broken or shorted harness between sensor and ECU
  • Corroded connector pins at sensor or ECU
  • Oil contamination or physical damage to sensor
  • Aftermarket sensor with different resistance curve

Fault status

⚠️ Status
Control unit detected an implausible or out-of-range oil temperature sensor signal (open, short, or incorrect resistance/voltage).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

B1388 B1390 P0521 P0522 P0118
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Code

B1389

FIAT B — Body

Oil temperature sensor

Brand: FIAT
Type: B — Body
Views: UK: 2 EN: 6 RU: 3
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or failed oil temperature sensor
  • Wiring open, short to ground or short to voltage in sensor circuit
  • Corroded, loose or contaminated connector
  • Poor ground or supply voltage to the sensor
  • Incorrect sensor installed or out-of-spec replacement
  • Intermittent fault caused by chafing or vibration

Symptoms

  • Check Engine light or instrument cluster warning active
  • Incorrect oil temperature reading on dash or no reading
  • Cold-start enrichment or fuel trim issues (if ECU uses oil temp)
  • Poor idle, rough running or unexpected engine behavior when oil temperature is used by control strategies
  • Intermittent faults or hard-to-reproduce warnings

What to check

  • Scan for stored freeze frame data and live oil temperature sensor readings with a diagnostic scan tool
  • Visually inspect sensor, connector and harness for damage, corrosion, oil contamination and secure fit
  • Back-probe sensor connector and check supply voltage and ground
  • Measure sensor resistance (with engine cold) and compare to expected resistance vs temperature curve
  • Wiggle harness and connector while monitoring live data to reproduce fault
  • Check for related codes (power/ground or communication faults)

Signal parameters

  • Typical oil temperature sensor type: NTC thermistor (resistance decreases as temperature increases)
  • Nominal resistance examples (typical ranges, manufacturer-specific values vary): ~20–40 kΩ at -40°C, ~8–12 kΩ at 25°C, ~1–3 kΩ at 100°C
  • Typical sensor signal voltage to ECU: approx. 0.2–4.8 V depending on temperature and circuit (varies by vehicle)
  • Supply/reference voltage to sensor circuit: commonly 5 V reference from ECU (verify with wiring diagram)

Diagnostic algorithm

  1. Retrieve and record freeze frame and live data for oil temperature. Note sensor behavior at ambient temperature and during warm-up.
  2. Visually inspect sensor, connector and harness for oil contamination, bent pins, corrosion, broken wires, chafing or heat damage.
  3. With ignition ON (engine off), check reference voltage at the sensor connector; verify proper ground. Record values.
  4. Measure sensor resistance at ambient temperature and compare to manufacturer specification or a typical NTC curve. If resistance is out of expected range, replace sensor.
  5. If resistance is correct, back-probe sensor signal while warming engine and observe voltage/resistance change. If signal does not change smoothly with temperature, suspect wiring, connector or ECU input.
  6. Perform continuity and insulation tests on harness between sensor and ECU. Repair any opens or shorts; repair corroded connectors or pins.
  7. After repairs or sensor replacement, clear codes and perform a road or warm-up test while monitoring live oil temperature to confirm correct operation and that code does not return.
  8. If wiring and sensor check good but fault persists, consult wiring diagrams and consider ECU input circuit testing or replacement by qualified technician.

Likely causes

  • Failed oil temperature sensor (NTC/thermistor)
  • Broken or shorted harness between sensor and ECU
  • Corroded connector pins at sensor or ECU
  • Oil contamination or physical damage to sensor
  • Aftermarket sensor with different resistance curve

Fault status

⚠️ Status
Control unit detected an implausible or out-of-range oil temperature sensor signal (open, short, or incorrect resistance/voltage).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

B1388 B1390 P0521 P0522 P0118
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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

B1389

Other B — Body

Oil Temperature Sensor Circuit Failure

Brand: Other
Type: B — Body
Views: UK: 11 EN: 15 RU: 12
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or failed oil temperature sensor
  • Wiring open, short to ground or short to voltage in sensor circuit
  • Corroded, loose or contaminated connector
  • Poor ground or supply voltage to the sensor
  • Incorrect sensor installed or out-of-spec replacement
  • Intermittent fault caused by chafing or vibration

Symptoms

  • Check Engine light or instrument cluster warning active
  • Incorrect oil temperature reading on dash or no reading
  • Cold-start enrichment or fuel trim issues (if ECU uses oil temp)
  • Poor idle, rough running or unexpected engine behavior when oil temperature is used by control strategies
  • Intermittent faults or hard-to-reproduce warnings

What to check

  • Scan for stored freeze frame data and live oil temperature sensor readings with a diagnostic scan tool
  • Visually inspect sensor, connector and harness for damage, corrosion, oil contamination and secure fit
  • Back-probe sensor connector and check supply voltage and ground
  • Measure sensor resistance (with engine cold) and compare to expected resistance vs temperature curve
  • Wiggle harness and connector while monitoring live data to reproduce fault
  • Check for related codes (power/ground or communication faults)

Signal parameters

  • Typical oil temperature sensor type: NTC thermistor (resistance decreases as temperature increases)
  • Nominal resistance examples (typical ranges, manufacturer-specific values vary): ~20–40 kΩ at -40°C, ~8–12 kΩ at 25°C, ~1–3 kΩ at 100°C
  • Typical sensor signal voltage to ECU: approx. 0.2–4.8 V depending on temperature and circuit (varies by vehicle)
  • Supply/reference voltage to sensor circuit: commonly 5 V reference from ECU (verify with wiring diagram)

Diagnostic algorithm

  1. Retrieve and record freeze frame and live data for oil temperature. Note sensor behavior at ambient temperature and during warm-up.
  2. Visually inspect sensor, connector and harness for oil contamination, bent pins, corrosion, broken wires, chafing or heat damage.
  3. With ignition ON (engine off), check reference voltage at the sensor connector; verify proper ground. Record values.
  4. Measure sensor resistance at ambient temperature and compare to manufacturer specification or a typical NTC curve. If resistance is out of expected range, replace sensor.
  5. If resistance is correct, back-probe sensor signal while warming engine and observe voltage/resistance change. If signal does not change smoothly with temperature, suspect wiring, connector or ECU input.
  6. Perform continuity and insulation tests on harness between sensor and ECU. Repair any opens or shorts; repair corroded connectors or pins.
  7. After repairs or sensor replacement, clear codes and perform a road or warm-up test while monitoring live oil temperature to confirm correct operation and that code does not return.
  8. If wiring and sensor check good but fault persists, consult wiring diagrams and consider ECU input circuit testing or replacement by qualified technician.

Likely causes

  • Failed oil temperature sensor (NTC/thermistor)
  • Broken or shorted harness between sensor and ECU
  • Corroded connector pins at sensor or ECU
  • Oil contamination or physical damage to sensor
  • Aftermarket sensor with different resistance curve

Fault status

⚠️ Status
Control unit detected an implausible or out-of-range oil temperature sensor signal (open, short, or incorrect resistance/voltage).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

B1388 B1390 P0521 P0522 P0118
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