P1183

Code

LAND ROVER P — Powertrain

Malfunction of the engine oil temperature sensor circuit

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 13 EN: 35 RU: 39

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Page language: EN

Causes

Faulty engine oil temperature (oil temp) sensor
Open or shorted wiring between sensor and ECM
Corroded, loose or damaged sensor connector or pins
Poor ground or reference supply from ECM
Oil contamination or sensor mechanical damage
Intermittent connection due to vibration or broken wire

Symptoms

MIL (check engine light) illuminated
Incorrect oil temperature reading on dash or scan tool (stuck, erratic or out-of-range)
Extended warm-up or incorrect engine load management
Possible reduced engine performance or protection strategies if the ECM uses oil temperature for control
Intermittent faults that may appear/disappear with vibration or temperature changes

What to check

Read and record freeze-frame/fault details with a diagnostic scanner
Monitor live oil temperature value and compare with expected (coolant temp and ambient)
Visually inspect sensor connector, pins and harness for corrosion, damage or oil ingress
Wiggle harness while monitoring live data to spot intermittent behavior
Check for other related codes (coolant temp, oil pressure)
Verify oil level and condition (severely contaminated oil can affect sensor)

Signal parameters

Sensor type: typically thermistor (NTC) — resistance falls as temperature rises
Expected behavior: oil temp reading should rise smoothly from ambient to operating temperature on warm-up
Reference/measurement: ECM commonly monitors a voltage produced by a pull-up or direct resistance — typical operating signal ranges are in the approx. 0.5–4.5 V span depending on temperature and vehicle design
Open-circuit symptom: sensor voltage may be pulled to fixed rail (e.g., near 0 V or near reference voltage) producing an out-of-range value
Short-to-ground or short-to-power: voltage stuck low or high respectively

Diagnostic algorithm

Retrieve P1183 and any related codes; note freeze-frame data and occurrence conditions.
Using a scan tool, monitor oil temperature sensor reading at key conditions (cold start, warm idle). Compare to coolant temperature and expected behavior.
Perform a visual inspection of the sensor connector and harness near the sensor for oil contamination, corrosion, crushed wires or pin damage.
With ignition ON (engine off) backprobe sensor connector and check for reference voltage and signal with a multimeter. Record voltages.
Measure sensor resistance (engine cold) at the sensor terminals and compare to manufacturer specification; then warm sensor slowly (if safe) to confirm resistance changes with temperature.
Check continuity of the wiring from the sensor connector to the ECM, and verify no short to battery/ground using an ohmmeter.
If reference voltage or ground is missing or abnormal at the connector, trace wiring back to ECM and inspect grounds and fuses/relays supplying sensor circuits.
If wiring and connector check OK and sensor resistance is out of spec or does not change with temperature, replace the oil temperature sensor.
After repair, clear codes and road-test to confirm proper operation and that P1183 does not return. If fault persists and wiring checks are good, consider ECM input fault and consult manufacturer guidance.

Likely causes

Damaged or contaminated oil temperature sensor
Damaged connector or corroded terminals at the sensor
Broken or chafed wiring causing open circuit or short to battery/ground
Faulty ground or missing reference voltage from the engine control module

Fault status

⚠️ Status

Malfunction of the engine oil temperature sensor circuit

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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Repair manuals

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P1183 — Malfunction of the engine oil temperature sensor circuit