U2000

Code

LAND ROVER U — Network/User

Engine temperature

Brand: LAND ROVER

Type: U — Network/User

Views: UK: 20 EN: 33 RU: 24

AI status

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Page language: EN

Causes

Faulty engine coolant temperature (ECT) sensor
Damaged or corroded wiring/connectors for the ECT sensor
Poor ground or power supply to sensor or engine control module (ECM)
Intermittent or failed module (ECM/BCM/TCM) communicating temperature data
CAN bus or other network communication fault (short, open, high resistance, termination issue)
Software/firmware glitch or calibration fault in a control module

Symptoms

MIL/Check Engine lamp illuminated
Temperature gauge erratic, pegged, or reading outside expected range
Cooling fan not operating as expected or running continuously
Reduced engine performance, limp-home mode, or altered idle
Hard starting, poor cold/hot start behavior, or increased fuel consumption
Stored or pending related P-codes (ECT related) or multiple network U-codes

What to check

Read and record all stored codes and freeze-frame data; note related P- and U-codes
Monitor live engine coolant temperature PID with a capable scan tool while key ON and during engine warm-up
Inspect ECT sensor connector and wiring for corrosion, damage, pins pushed out, or poor contacts
Check battery voltage and charging system; verify stable supply to modules
Measure continuity and resistance of sensor circuit and check for shorts to ground/power
Verify module grounds at engine block/body and power supply fuses/relays

Signal parameters

Engine Coolant Temperature (ECT) PID — should change smoothly as engine warms
ECT sensor voltage/voltage signal under varying engine temps (key ON and running)
Sensor resistance (if applicable) compared to manufacturer temperature table
Battery voltage (should be stable during tests)
CAN High and CAN Low voltages at rest and during communication
PCM/ECM supply voltage and ground integrity

Diagnostic algorithm

Connect a diagnostic scan tool and retrieve all U- and P-codes, freeze frame and live PIDs. Note time stamps and related events.
Confirm whether ECT PID is present and whether its value is plausible versus ambient/coolant temperature (use IR thermometer or coolant probe).
Visually inspect sensor connector and harness for damage, corrosion, bent pins and secure mating. Repair any visible issues and re-test.
Check battery/ground connections and chassis/engine grounds. Clean and secure any suspect connections.
Probe the ECT sensor circuit: with connector disconnected measure sensor resistance across terminals and compare to temperature chart; measure sensor voltage with connector connected (back-probing) during key ON and engine warm-up.
Check for shorts/opens: measure continuity to ECM connector pins and verify no short to battery or ground. Repair wiring faults as required.
Verify CAN bus operation: measure CANH/CANL voltages, inspect for damaged network wiring, and scan for other modules reporting communication faults. Repair network wiring/termination issues.
If wiring and sensor check good but fault persists, perform module self-tests and consider reprogramming or reflashing module software per Land Rover service procedures.
After repairs clear codes, perform a warm-up and road test while monitoring ECT PID and related parameters to confirm the fault does not return.
If intermittent communication faults continue, consider module replacement only after exhaustive wiring and network testing and confirming module failure with bench or dealer-level diagnostics.

Likely causes

Faulty or intermittent ECT sensor or its connector
Wiring damage or corrosion between sensor and ECM
Loss of communication on CAN/LIN network affecting temperature PID
Bad ground or power supply to ECM or sensor circuit
Module fault (ECM or network module) or software error

Fault status

⚠️ Status

Control module reports invalid or missing engine temperature data or related communication fault. May be intermittent or continuous; further testing required to isolate sensor, wiring, network, or module issues.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5-3.5 hours

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U2000 — Engine temperature