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Home / DTC / U2199 — Temperature data of invalid engine coolant

U2199 — Temperature data of invalid engine coolant

Detailed page for trouble code U2199.

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U2199

LAND ROVER U — Network/User

Temperature data of invalid engine coolant

Brand: LAND ROVER
Type: U — Network/User
Views: UK: 10 EN: 15 RU: 8
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Page language: EN

Causes

  • Faulty engine coolant temperature (ECT) sensor
  • Open, shorted, corroded or damaged wiring/connectors between sensor and ECU/module
  • Defective ECU/module sending or receiving the coolant temperature message
  • CAN/LIN network communication faults (bus errors, missing/garbled messages, poor termination)
  • Intermittent power or ground to sensor or module
  • Software calibration/firmware error or mismatch after module replacement

Symptoms

  • Malfunction Indicator Lamp (MIL) or instrument cluster warning illumination
  • Incorrect or rapidly fluctuating coolant temperature gauge/reading
  • Poor cold-start behavior or extended warm-up (engine running rich or fan operation abnormal)
  • Climate control or engine management may behave oddly (fan on/off, fast idle)
  • Related codes for coolant temperature circuit or communication may be present

What to check

  • Read U2199 and any related freeze-frame/live-data with a capable scan tool; record timestamps
  • Check for related DTCs (P0117, P0118, U0100, U0401, etc.)
  • Visually inspect ECT sensor connector and wiring for damage, corrosion, or water ingress
  • Measure sensor reference voltage and ground at the connector (typically ~5 V reference)
  • Measure sensor resistance vs ambient temperature or compare live coolant temp PID to ambient/actual
  • Check CAN bus physical layer: voltages on CAN_H/CAN_L, termination resistance, and for bus errors

Signal parameters

  • CAN message ID and source module that publishes engine coolant temperature (model dependent)
  • Message frequency/period and timeout behaviour (expected periodicity of the PID)
  • Data byte/bit assignment and scaling for coolant temperature (manufacturer-specific)
  • Expected coolant temperature range (approx. -40°C to +150°C; values outside are invalid)
  • Sensor reference voltage (typically 5 V) and expected sensor resistance range vs temperature
  • CAN_H and CAN_L idle voltages (~2.5 V) and differential amplitude under normal conditions

Diagnostic algorithm

  1. Connect a full-function scan tool and confirm U2199 and any related codes; note freeze frame and live data.
  2. Clear codes and attempt to reproduce; observe whether the code returns and under what conditions.
  3. Compare coolant temperature PID across multiple modules (ECM, instrument cluster, HVAC) to identify which node reports invalid data.
  4. Visually inspect the ECT sensor, connector, and wiring harness for damage, corrosion, pin push-out, or water.
  5. With ignition on (engine off), measure sensor reference voltage and ground at the connector. Repair any missing reference or ground.
  6. Remove the sensor (if accessible) and measure resistance vs temperature (compare to spec). Substitute a known-good sensor if available.
  7. Back-probe the sensor while warming/cooling the engine and verify the coolant temperature PID follows expected changes.
  8. If sensor and wiring check good, monitor the CAN bus: check CAN voltages, termination resistance, and scan for bus errors or missing messages from the source module.
  9. If the module sending the temp is not communicating properly, perform targeted diagnostics on that module (power/ground, wake-up, software level).
  10. Repair/replace faulty wiring, connector, sensor, or module as indicated. Clear codes and re-test to confirm resolution.
  11. If intermittent or complex network faults remain, consult manufacturer service bulletins and consider reprogramming/updating module software.

Likely causes

  • Failed or intermittent ECT sensor
  • Connector corrosion or wiring damage at the sensor
  • Loss or corruption of the CAN message from the module that publishes coolant temperature
  • Poor ground or low reference voltage at sensor or receiving module

Fault status

⚠️ Status
Invalid engine coolant temperature data received on vehicle network — data out of range, missing, or corrupted. Check ECT sensor, wiring, and network communication.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

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