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Home / DTC / B2784 — Internal humidity sensor for dual automatic temperature control open circuit

B2784 — Internal humidity sensor for dual automatic temperature control open circuit

Detailed page for trouble code B2784.

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Code

B2784

LAND ROVER B — Body

Internal humidity sensor for dual automatic temperature control open circuit

Brand: LAND ROVER
Type: B — Body
Views: UK: 10 EN: 14 RU: 11
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Page language: EN

Causes

  • Open or broken wiring in the humidity sensor circuit
  • Corroded, loose, or damaged connector at the humidity sensor or HVAC control unit
  • Failed internal humidity sensor element
  • Water ingress or contamination at the sensor or connector
  • Faulty HVAC/temperature control module (internal connector/circuit fault)
  • Previous repairs with poor connector pin fit or chafed harness

Symptoms

  • DTC B2784 stored in HVAC/vehicle control unit
  • Automatic climate control may disable humidity-dependent functions or revert to default/blower-only control
  • Incorrect or no humidity readings in diagnostic tool/live data
  • Interior fogging or reduced dehumidification performance
  • Possible warning/attention message related to climate control

What to check

  • Retrieve fault codes and freeze frame data with a scan tool; note occurrences and conditions
  • Clear codes, perform functional test and attempt to re-create the fault
  • Visually inspect sensor location, wiring harness, and connectors for damage, corrosion or water ingress
  • Inspect HVAC control module connectors for damage or pushed-out pins
  • Check for aftermarket components or previous repairs in the dash/harness area
  • Check vehicle service information for sensor location and wiring diagrams

Signal parameters

  • Sensor type: typically a humidity sensing element that changes resistance or outputs a voltage proportional to relative humidity
  • Typical output: low-voltage signal to HVAC/module (commonly in the 0.5–4.5 V range) or an I2C/serial-type sensor on some modules — consult vehicle wiring diagram
  • Expected range: 0–100 %RH when displayed; signal should not be open (infinite resistance) or shorted to voltage/ground

Diagnostic algorithm

  1. Connect a diagnostic scanner; record B2784 and any related HVAC/body codes. Clear codes and attempt to re-create fault while monitoring live data. 2) Locate the internal humidity sensor per factory service information (often on HVAC housing or within instrument cluster/AC module). 3) Visually inspect sensor and connectors for corrosion, water, or damage; repair/clean connectors if required. 4) With ignition ON, backprobe the sensor connector and measure supply voltage, ground continuity, and signal line voltage while monitoring humidity value on the scanner. Compare to manufacturer specification. 5) If signal is open at the sensor, perform continuity check from sensor connector to HVAC control module connector; repair any opens or chafed wiring. 6) If wiring is good and supply/ground present but signal open, replace the humidity sensor. 7) If replacement sensor does not clear fault and wiring checks OK, test/replace the HVAC control module or repair internal connector faults per manufacturer procedures. 8) After repairs, clear codes and verify proper operation and that DTC does not return under the same conditions.

Likely causes

  • Broken/disconnected signal wire between humidity sensor and control module
  • Connector pins corroded or pushed out at the sensor or module
  • Humidity sensor itself failed (open element)
  • Ground or supply fault causing sensor to read open
  • Water intrusion causing open circuit

Fault status

⚠️ Status
Open circuit detected on the internal humidity sensor for the dual automatic temperature control. HVAC module cannot obtain humidity input; humidity-based automatic climate functions may be disabled.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B2782 B2783 B2785 B2790 B2741
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