P0183

Code

LAND ROVER P — Powertrain

Fuel temperature sensor High input circuit

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 32 EN: 45 RU: 114

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Page language: EN

Causes

Open circuit or broken wiring between fuel temperature sensor and ECM
Poor or corroded connector terminals at sensor or ECU
Faulty fuel temperature sensor (thermistor) — open or internally shorted
Short to battery voltage on the sensor signal circuit
ECM input circuit fault or intermittent internal failure
Aftermarket modifications or recent fuel system work disturbing connector/wiring

Symptoms

Check Engine Light (MIL) illuminated
Incorrect or missing fuel temperature display (if vehicle shows fuel temp)
Possible rough idle, hard starting or fuel trim abnormalities under certain conditions
Reduced fuel efficiency or drivability issues if ECM uses fuel temp for fueling strategy
Failed emissions test or limp-home strategy in some vehicles

What to check

Read freeze-frame and live data to confirm fuel temperature reading and when code set
Verify exact code history and if multiple related codes are present (IAT, fuel pressure, wiring)
Visually inspect sensor connector and wiring for corrosion, damage, or water ingress
Backprobe sensor connector and check reference voltage, signal voltage, and ground with ignition on
Measure sensor resistance vs. temperature if applicable (compare to reference values if available)
Check continuity to the ECM pin and for short to battery or ground

Signal parameters

Typical sensor signal range: ~0.1–4.9 V (varies by design); a 'high input' is commonly >4.7 V or flagged as open/high impedance by the ECM
Open-circuit condition: very high resistance or infinite ohms between sensor terminals
Normal thermistor behavior: resistance changes with temperature (NTC = higher resistance at lower temps, lower resistance at higher temps)
Short to 12V: signal near battery voltage (~12 V) or above expected sensor voltage range
Short to ground: signal ~0 V (this is the opposite code P0182 for low input)

Diagnostic algorithm

Retrieve freeze frame and live data for fuel temperature, battery voltage and related sensors. Note conditions when code stored.
Perform a visual inspection of the fuel temperature sensor, connector, and wiring (look for corrosion, bent pins, heat damage, chafing).
With ignition ON (engine off), backprobe the sensor connector: verify reference supply (if used), signal voltage and ground presence. Record values.
Disconnect the sensor and measure signal circuit voltage at the connector to check for short to battery (signal present with sensor unplugged indicates short to 12 V).
Measure sensor resistance across its terminals at known ambient temperature and compare to reference chart (or verify it changes when warmed/cooled). An open or infinite reading indicates a failed sensor.
Check continuity from the sensor connector to the ECM pin; look for opens or high resistance and inspect for shorts to other circuits or battery.
Repair any wiring or connector faults found (clean/replace connector, repair harness, protect routing) and retest.
If wiring and connector are good but sensor readings are out of range, replace the fuel temperature sensor and clear codes.
If issue persists after sensor replacement, suspect ECM input failure and consult manufacturer guidance before replacing ECM.
After repairs, clear codes and perform a road/test drive or reproduce conditions to confirm the fault does not return.

Likely causes

Disconnected or corroded sensor connector at the fuel rail
Damaged wiring harness (chafing, pinched, melted insulation) causing an open or short to 12V
Failed thermistor inside the sensor (open-circuit)
Faulty ECM input driver (less common)
Poor ground or shared circuit fault affecting sensor reference

Fault status

⚠️ Status

Fuel temperature sensor — high input circuit detected. ECM sees abnormally high voltage or open/high-impedance on the fuel temp sensor circuit.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-1.5 hours

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P0183 — Fuel temperature sensor High input circuit