B2428

Code

LAND ROVER B — Body

Heater Sensor 2 - circuit failure

Brand: LAND ROVER

Type: B — Body

Views: UK: 13 EN: 19 RU: 18

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Page language: EN

Causes

Open circuit (broken wire, damaged harness)
Short to ground or battery voltage in sensor circuit
Corroded, loose, or contaminated connector pins
Failed heater sensor (thermistor or temperature sensor)
Faulty HVAC / heater control module or seat module
Software/firmware glitch or corrupted module programming

Symptoms

DTC B2428 stored in HVAC/body module memory
Loss of function or unreliable operation of associated heater circuit (seat or HVAC zone)
Incorrect temperature reading for the affected sensor or inconsistent climate control behavior
Warning message on dash or HVAC display (model dependent)
Reduced heating comfort or one zone/seat not heating correctly

What to check

Retrieve full fault data with an OEM-level scan tool (freeze frame, fault timestamps)
Visually inspect sensor, harness, and connector for damage, corrosion, or signs of water ingress
Check for other related DTCs in HVAC, body, or seat modules
Backprobe connector and verify reference voltage and ground present with ignition on
Measure resistance or voltage of Heater Sensor 2 and compare to expected behavior while changing temperature (or warming sensor by hand)
Perform continuity check between sensor connector and the control module pin to locate open/shorts

Signal parameters

Type: typically a resistance-based temperature sensor (thermistor) or low-voltage signal input
Typical reference: single-ended 5 V reference (common) — verify on vehicle-specific documentation
Signal behavior: resistance changes with temperature (resistance decreases or increases depending on thermistor type)
Typical signal voltage range: ~0.5–4.5 V under normal conditions (vehicle-specific)
Expected open-circuit: extremely high resistance (OL) or signal near battery/ignition voltage if shorted to Vb; short to ground yields near 0 V

Diagnostic algorithm

Connect OEM-level scan tool. Read and record B2428 and any related codes; note freeze-frame data and live sensor values. Clear code and attempt to re-create condition to confirm persistence.
Perform a visual inspection of Heater Sensor 2, its connector, and wiring for damage, corrosion, chafing, or moisture. Repair visible issues and retest.
With ignition ON (engine off unless procedure requires running), backprobe the sensor connector: verify reference voltage, sensor signal voltage, and ground continuity to chassis. Compare to vehicle-specific expected values.
Measure sensor resistance (if thermistor) at ambient temperature and while warming/cooling it (by hand or with controlled heat). Resistance should change smoothly with temperature; open or fixed values indicate a failed sensor.
Perform continuity test from sensor pin to control module pin to detect opens. Check for shorts to ground or battery voltage along harness.
If wiring and sensor test good, inspect/control module connector and pins; check for corrosion or pushed-out pins. Swap or test with an equivalent known-good sensor if available.
If harness and sensor are good but circuit still faults, perform module input circuit testing per manufacturer procedures; consider reflashing or replacing control module after confirming electrical integrity.
Clear codes, perform functional test cycles, and verify no reappearance under normal operating conditions before concluding repair.

Likely causes

Damaged connector or corroded pins at Heater Sensor 2
Open or short in sensor wiring between sensor and control module
Failed Heater Sensor 2 (internal short or open)
Ground or reference supply fault to the sensor (loose/poor ground)
Control module input circuit fault or intermittent module failure

Fault status

⚠️ Status

Heater Sensor 2 — circuit failure detected (open/short/out-of-range). Verify sensor, wiring, and module input before replacement.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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