Code
P0117
Generic
P — Powertrain
Engine Coolant Temperature Sensor 1 Circuit Low
Views:
UK: 24
EN: 40
RU: 49
AI status
Completed
Completed
100%
Causes
- Short to ground in ECT sensor signal wire
- Faulty/shorted ECT sensor (thermistor)
- Corroded, loose, or damaged sensor connector or terminals
- Open or shorted wiring between sensor and ECU
- Missing or incorrect reference voltage from ECU
- Water intrusion or contamination in connector
Symptoms
- Engine may run rich or have poor cold‑start behavior
- Illuminated MIL / Check Engine Light
- Incorrect coolant temperature display on dash (may read very high or very low)
- Reduced engine performance or limp mode on some vehicles
- Abnormal idle or stalling during warmup
What to check
- Read freeze frame / live data for ECT voltage and temperature value
- Visually inspect sensor, connector, and wiring for damage, corrosion, or contamination
- Backprobe harness connector and measure sensor signal voltage with key ON (engine off)
- Measure reference voltage at the harness (typically ~5V — check vehicle spec)
- Measure sensor resistance at ambient temperature and compare to spec
- Check continuity and resistance of signal wire to ECU; check for short to ground
Signal parameters
- Typical sensor type: NTC thermistor to ground (ECU provides pull‑up/reference)
- Reference/pull‑up voltage: commonly ≈5.0 V (varies by vehicle) — consult service data
- Normal signal voltage range: ~0.1 V (hot) to ~4.5 V (cold) depending on circuit design; low‑circuit fault often
- Typical sensor resistance examples (varies by sensor): ~2–3 kΩ at ~20 °C, several hundred ohms at ~80 °C — verify exact spec
Diagnostic algorithm
- Retrieve freeze frame and live data: note ECT voltage and calculated temperature when the code set.
- Visually inspect sensor and connector for corrosion, bent pins, or contamination. Repair or clean as needed.
- With key ON (engine off), backprobe the signal wire at the harness. Verify reference/pull‑up voltage present at the connector and measure signal voltage. If signal is near 0 V while reference is present, suspect short to ground or sensor short.
- Unplug sensor and measure harness signal pin voltage again. If voltage remains low with sensor unplugged, suspect wiring short or ECU input fault. If voltage rises to reference, continue testing sensor.
- Measure sensor resistance at ambient temperature and compare to manufacturer spec. If resistance is abnormally low (near short) replace sensor.
- Check continuity from sensor connector to ECU pin and check for short to ground or to other circuits. Repair any damaged wiring.
- If wiring and sensor check good, verify ECU reference/pull‑up circuit operation. If ECU output is absent or shorted, suspect ECU fault and follow manufacturer procedures before replacement.
- After repairs, clear codes, perform functional test or test drive and confirm code does not return.
Likely causes
- Damaged or corroded connector at the ECT sensor
- Shorted sensor signal wire to chassis ground
- Failed ECT sensor (internal short or low resistance)
- Damaged wiring harness where it flexes or rubs
- Faulty ECU input or compromised reference pull‑up circuit
Fault status
Status
P0117 — Engine Coolant Temperature Sensor 1 Circuit Low. ECU detected lower than expected voltage on the ECT sensor circuit (possible short to ground, failed sensor, wiring/connector or ECU input fault).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P0117
GWM
P — Powertrain
- Engine Coolant Temperature Sensor Low
Views:
UK: 5
EN: 10
RU: 12
AI status
Completed
Completed
100%
Causes
- Short to ground in ECT sensor signal wire
- Faulty/shorted ECT sensor (thermistor)
- Corroded, loose, or damaged sensor connector or terminals
- Open or shorted wiring between sensor and ECU
- Missing or incorrect reference voltage from ECU
- Water intrusion or contamination in connector
Symptoms
- Engine may run rich or have poor cold‑start behavior
- Illuminated MIL / Check Engine Light
- Incorrect coolant temperature display on dash (may read very high or very low)
- Reduced engine performance or limp mode on some vehicles
- Abnormal idle or stalling during warmup
What to check
- Read freeze frame / live data for ECT voltage and temperature value
- Visually inspect sensor, connector, and wiring for damage, corrosion, or contamination
- Backprobe harness connector and measure sensor signal voltage with key ON (engine off)
- Measure reference voltage at the harness (typically ~5V — check vehicle spec)
- Measure sensor resistance at ambient temperature and compare to spec
- Check continuity and resistance of signal wire to ECU; check for short to ground
Signal parameters
- Typical sensor type: NTC thermistor to ground (ECU provides pull‑up/reference)
- Reference/pull‑up voltage: commonly ≈5.0 V (varies by vehicle) — consult service data
- Normal signal voltage range: ~0.1 V (hot) to ~4.5 V (cold) depending on circuit design; low‑circuit fault often
- Typical sensor resistance examples (varies by sensor): ~2–3 kΩ at ~20 °C, several hundred ohms at ~80 °C — verify exact spec
Diagnostic algorithm
- Retrieve freeze frame and live data: note ECT voltage and calculated temperature when the code set.
- Visually inspect sensor and connector for corrosion, bent pins, or contamination. Repair or clean as needed.
- With key ON (engine off), backprobe the signal wire at the harness. Verify reference/pull‑up voltage present at the connector and measure signal voltage. If signal is near 0 V while reference is present, suspect short to ground or sensor short.
- Unplug sensor and measure harness signal pin voltage again. If voltage remains low with sensor unplugged, suspect wiring short or ECU input fault. If voltage rises to reference, continue testing sensor.
- Measure sensor resistance at ambient temperature and compare to manufacturer spec. If resistance is abnormally low (near short) replace sensor.
- Check continuity from sensor connector to ECU pin and check for short to ground or to other circuits. Repair any damaged wiring.
- If wiring and sensor check good, verify ECU reference/pull‑up circuit operation. If ECU output is absent or shorted, suspect ECU fault and follow manufacturer procedures before replacement.
- After repairs, clear codes, perform functional test or test drive and confirm code does not return.
Likely causes
- Damaged or corroded connector at the ECT sensor
- Shorted sensor signal wire to chassis ground
- Failed ECT sensor (internal short or low resistance)
- Damaged wiring harness where it flexes or rubs
- Faulty ECU input or compromised reference pull‑up circuit
Fault status
Status
P0117 — Engine Coolant Temperature Sensor 1 Circuit Low. ECU detected lower than expected voltage on the ECT sensor circuit (possible short to ground, failed sensor, wiring/connector or ECU input fault).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
P0117
HUMMER
P — Powertrain
Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage
Views:
UK: 9
EN: 25
RU: 31
AI status
Completed
Completed
100%
Causes
- Short to ground in ECT sensor signal wire
- Faulty/shorted ECT sensor (thermistor)
- Corroded, loose, or damaged sensor connector or terminals
- Open or shorted wiring between sensor and ECU
- Missing or incorrect reference voltage from ECU
- Water intrusion or contamination in connector
Symptoms
- Engine may run rich or have poor cold‑start behavior
- Illuminated MIL / Check Engine Light
- Incorrect coolant temperature display on dash (may read very high or very low)
- Reduced engine performance or limp mode on some vehicles
- Abnormal idle or stalling during warmup
What to check
- Read freeze frame / live data for ECT voltage and temperature value
- Visually inspect sensor, connector, and wiring for damage, corrosion, or contamination
- Backprobe harness connector and measure sensor signal voltage with key ON (engine off)
- Measure reference voltage at the harness (typically ~5V — check vehicle spec)
- Measure sensor resistance at ambient temperature and compare to spec
- Check continuity and resistance of signal wire to ECU; check for short to ground
Signal parameters
- Typical sensor type: NTC thermistor to ground (ECU provides pull‑up/reference)
- Reference/pull‑up voltage: commonly ≈5.0 V (varies by vehicle) — consult service data
- Normal signal voltage range: ~0.1 V (hot) to ~4.5 V (cold) depending on circuit design; low‑circuit fault often
- Typical sensor resistance examples (varies by sensor): ~2–3 kΩ at ~20 °C, several hundred ohms at ~80 °C — verify exact spec
Diagnostic algorithm
- Retrieve freeze frame and live data: note ECT voltage and calculated temperature when the code set.
- Visually inspect sensor and connector for corrosion, bent pins, or contamination. Repair or clean as needed.
- With key ON (engine off), backprobe the signal wire at the harness. Verify reference/pull‑up voltage present at the connector and measure signal voltage. If signal is near 0 V while reference is present, suspect short to ground or sensor short.
- Unplug sensor and measure harness signal pin voltage again. If voltage remains low with sensor unplugged, suspect wiring short or ECU input fault. If voltage rises to reference, continue testing sensor.
- Measure sensor resistance at ambient temperature and compare to manufacturer spec. If resistance is abnormally low (near short) replace sensor.
- Check continuity from sensor connector to ECU pin and check for short to ground or to other circuits. Repair any damaged wiring.
- If wiring and sensor check good, verify ECU reference/pull‑up circuit operation. If ECU output is absent or shorted, suspect ECU fault and follow manufacturer procedures before replacement.
- After repairs, clear codes, perform functional test or test drive and confirm code does not return.
Likely causes
- Damaged or corroded connector at the ECT sensor
- Shorted sensor signal wire to chassis ground
- Failed ECT sensor (internal short or low resistance)
- Damaged wiring harness where it flexes or rubs
- Faulty ECU input or compromised reference pull‑up circuit
Fault status
Status
P0117 — Engine Coolant Temperature Sensor 1 Circuit Low. ECU detected lower than expected voltage on the ECT sensor circuit (possible short to ground, failed sensor, wiring/connector or ECU input fault).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
P0117
ISUZU
P — Powertrain
Engine Coolant Temperature Sensor Circuit Low
Views:
UK: 16
EN: 33
RU: 45
AI status
Completed
Completed
100%
Causes
- Short to ground in ECT sensor signal wire
- Faulty/shorted ECT sensor (thermistor)
- Corroded, loose, or damaged sensor connector or terminals
- Open or shorted wiring between sensor and ECU
- Missing or incorrect reference voltage from ECU
- Water intrusion or contamination in connector
Symptoms
- Engine may run rich or have poor cold‑start behavior
- Illuminated MIL / Check Engine Light
- Incorrect coolant temperature display on dash (may read very high or very low)
- Reduced engine performance or limp mode on some vehicles
- Abnormal idle or stalling during warmup
What to check
- Read freeze frame / live data for ECT voltage and temperature value
- Visually inspect sensor, connector, and wiring for damage, corrosion, or contamination
- Backprobe harness connector and measure sensor signal voltage with key ON (engine off)
- Measure reference voltage at the harness (typically ~5V — check vehicle spec)
- Measure sensor resistance at ambient temperature and compare to spec
- Check continuity and resistance of signal wire to ECU; check for short to ground
Signal parameters
- Typical sensor type: NTC thermistor to ground (ECU provides pull‑up/reference)
- Reference/pull‑up voltage: commonly ≈5.0 V (varies by vehicle) — consult service data
- Normal signal voltage range: ~0.1 V (hot) to ~4.5 V (cold) depending on circuit design; low‑circuit fault often
- Typical sensor resistance examples (varies by sensor): ~2–3 kΩ at ~20 °C, several hundred ohms at ~80 °C — verify exact spec
Diagnostic algorithm
- Retrieve freeze frame and live data: note ECT voltage and calculated temperature when the code set.
- Visually inspect sensor and connector for corrosion, bent pins, or contamination. Repair or clean as needed.
- With key ON (engine off), backprobe the signal wire at the harness. Verify reference/pull‑up voltage present at the connector and measure signal voltage. If signal is near 0 V while reference is present, suspect short to ground or sensor short.
- Unplug sensor and measure harness signal pin voltage again. If voltage remains low with sensor unplugged, suspect wiring short or ECU input fault. If voltage rises to reference, continue testing sensor.
- Measure sensor resistance at ambient temperature and compare to manufacturer spec. If resistance is abnormally low (near short) replace sensor.
- Check continuity from sensor connector to ECU pin and check for short to ground or to other circuits. Repair any damaged wiring.
- If wiring and sensor check good, verify ECU reference/pull‑up circuit operation. If ECU output is absent or shorted, suspect ECU fault and follow manufacturer procedures before replacement.
- After repairs, clear codes, perform functional test or test drive and confirm code does not return.
Likely causes
- Damaged or corroded connector at the ECT sensor
- Shorted sensor signal wire to chassis ground
- Failed ECT sensor (internal short or low resistance)
- Damaged wiring harness where it flexes or rubs
- Faulty ECU input or compromised reference pull‑up circuit
Fault status
Status
P0117 — Engine Coolant Temperature Sensor 1 Circuit Low. ECU detected lower than expected voltage on the ECT sensor circuit (possible short to ground, failed sensor, wiring/connector or ECU input fault).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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+100 karma for a short comment :)
Was this AI description helpful?
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Code
P0117
LAND ROVER
P — Powertrain
Engine Coolant Temperature Circuit Low Input
Views:
UK: 9
EN: 21
RU: 29
AI status
Completed
Completed
100%
Causes
- Short to ground in ECT sensor signal wire
- Faulty/shorted ECT sensor (thermistor)
- Corroded, loose, or damaged sensor connector or terminals
- Open or shorted wiring between sensor and ECU
- Missing or incorrect reference voltage from ECU
- Water intrusion or contamination in connector
Symptoms
- Engine may run rich or have poor cold‑start behavior
- Illuminated MIL / Check Engine Light
- Incorrect coolant temperature display on dash (may read very high or very low)
- Reduced engine performance or limp mode on some vehicles
- Abnormal idle or stalling during warmup
What to check
- Read freeze frame / live data for ECT voltage and temperature value
- Visually inspect sensor, connector, and wiring for damage, corrosion, or contamination
- Backprobe harness connector and measure sensor signal voltage with key ON (engine off)
- Measure reference voltage at the harness (typically ~5V — check vehicle spec)
- Measure sensor resistance at ambient temperature and compare to spec
- Check continuity and resistance of signal wire to ECU; check for short to ground
Signal parameters
- Typical sensor type: NTC thermistor to ground (ECU provides pull‑up/reference)
- Reference/pull‑up voltage: commonly ≈5.0 V (varies by vehicle) — consult service data
- Normal signal voltage range: ~0.1 V (hot) to ~4.5 V (cold) depending on circuit design; low‑circuit fault often
- Typical sensor resistance examples (varies by sensor): ~2–3 kΩ at ~20 °C, several hundred ohms at ~80 °C — verify exact spec
Diagnostic algorithm
- Retrieve freeze frame and live data: note ECT voltage and calculated temperature when the code set.
- Visually inspect sensor and connector for corrosion, bent pins, or contamination. Repair or clean as needed.
- With key ON (engine off), backprobe the signal wire at the harness. Verify reference/pull‑up voltage present at the connector and measure signal voltage. If signal is near 0 V while reference is present, suspect short to ground or sensor short.
- Unplug sensor and measure harness signal pin voltage again. If voltage remains low with sensor unplugged, suspect wiring short or ECU input fault. If voltage rises to reference, continue testing sensor.
- Measure sensor resistance at ambient temperature and compare to manufacturer spec. If resistance is abnormally low (near short) replace sensor.
- Check continuity from sensor connector to ECU pin and check for short to ground or to other circuits. Repair any damaged wiring.
- If wiring and sensor check good, verify ECU reference/pull‑up circuit operation. If ECU output is absent or shorted, suspect ECU fault and follow manufacturer procedures before replacement.
- After repairs, clear codes, perform functional test or test drive and confirm code does not return.
Likely causes
- Damaged or corroded connector at the ECT sensor
- Shorted sensor signal wire to chassis ground
- Failed ECT sensor (internal short or low resistance)
- Damaged wiring harness where it flexes or rubs
- Faulty ECU input or compromised reference pull‑up circuit
Fault status
Status
P0117 — Engine Coolant Temperature Sensor 1 Circuit Low. ECU detected lower than expected voltage on the ECT sensor circuit (possible short to ground, failed sensor, wiring/connector or ECU input fault).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
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+100 karma for a short comment :)
Was this AI description helpful?
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Code
P0117
MITSUBISHI
P — Powertrain
Engine coolant TEMP.sensor low
Views:
UK: 10
EN: 24
RU: 36
AI status
Completed
Completed
100%
Causes
- Short to ground in ECT sensor signal wire
- Faulty/shorted ECT sensor (thermistor)
- Corroded, loose, or damaged sensor connector or terminals
- Open or shorted wiring between sensor and ECU
- Missing or incorrect reference voltage from ECU
- Water intrusion or contamination in connector
Symptoms
- Engine may run rich or have poor cold‑start behavior
- Illuminated MIL / Check Engine Light
- Incorrect coolant temperature display on dash (may read very high or very low)
- Reduced engine performance or limp mode on some vehicles
- Abnormal idle or stalling during warmup
What to check
- Read freeze frame / live data for ECT voltage and temperature value
- Visually inspect sensor, connector, and wiring for damage, corrosion, or contamination
- Backprobe harness connector and measure sensor signal voltage with key ON (engine off)
- Measure reference voltage at the harness (typically ~5V — check vehicle spec)
- Measure sensor resistance at ambient temperature and compare to spec
- Check continuity and resistance of signal wire to ECU; check for short to ground
Signal parameters
- Typical sensor type: NTC thermistor to ground (ECU provides pull‑up/reference)
- Reference/pull‑up voltage: commonly ≈5.0 V (varies by vehicle) — consult service data
- Normal signal voltage range: ~0.1 V (hot) to ~4.5 V (cold) depending on circuit design; low‑circuit fault often
- Typical sensor resistance examples (varies by sensor): ~2–3 kΩ at ~20 °C, several hundred ohms at ~80 °C — verify exact spec
Diagnostic algorithm
- Retrieve freeze frame and live data: note ECT voltage and calculated temperature when the code set.
- Visually inspect sensor and connector for corrosion, bent pins, or contamination. Repair or clean as needed.
- With key ON (engine off), backprobe the signal wire at the harness. Verify reference/pull‑up voltage present at the connector and measure signal voltage. If signal is near 0 V while reference is present, suspect short to ground or sensor short.
- Unplug sensor and measure harness signal pin voltage again. If voltage remains low with sensor unplugged, suspect wiring short or ECU input fault. If voltage rises to reference, continue testing sensor.
- Measure sensor resistance at ambient temperature and compare to manufacturer spec. If resistance is abnormally low (near short) replace sensor.
- Check continuity from sensor connector to ECU pin and check for short to ground or to other circuits. Repair any damaged wiring.
- If wiring and sensor check good, verify ECU reference/pull‑up circuit operation. If ECU output is absent or shorted, suspect ECU fault and follow manufacturer procedures before replacement.
- After repairs, clear codes, perform functional test or test drive and confirm code does not return.
Likely causes
- Damaged or corroded connector at the ECT sensor
- Shorted sensor signal wire to chassis ground
- Failed ECT sensor (internal short or low resistance)
- Damaged wiring harness where it flexes or rubs
- Faulty ECU input or compromised reference pull‑up circuit
Fault status
Status
P0117 — Engine Coolant Temperature Sensor 1 Circuit Low. ECU detected lower than expected voltage on the ECT sensor circuit (possible short to ground, failed sensor, wiring/connector or ECU input fault).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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0
Send to email