B2810

Code

LAND ROVER B — Body

Air suspension vent solenoid - circuit failure Fault in the evaporator temperature thermistor evaporator temperature thermistor

Brand: LAND ROVER

Type: B — Body

Views: UK: 14 EN: 25 RU: 20

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Page language: EN

Causes

Open or short in vent solenoid wiring or connector
Faulty air suspension vent solenoid (coils/stuck plunger)
Poor or corroded connector or pin(s) at module or solenoid
Faulty body/air suspension control module or driver transistor
Low or intermittent supply voltage (blown fuse, poor ground)
Evaporator temperature thermistor open/short or poor connector (if code refers to HVAC sensor)

Symptoms

Air suspension failing to vent/level or slow/uneven leveling
Suspension warning message or lamp on dash
HVAC performance issues or incorrect cabin temperature control (if evaporator thermistor affected)
Stored DTC B2810 (with or without additional suspension or HVAC codes)
Intermittent or permanent loss of vent solenoid operation when commanded

What to check

Read all stored DTCs and freeze frame/confirmation counts with a full dealer-level or capable scan tool
Attempt to command the vent solenoid ON/OFF with a diagnostic tool and observe response
Visually inspect wiring harnesses and connectors for damage, corrosion, bent pins, or water ingress
Check related fuses and relays for continuity and correct operation
Backprobe connector to measure supply voltage and ground while commanding the solenoid
Measure thermistor resistance at the HVAC evaporator sensor at known ambient temperature if HVAC symptom present

Signal parameters

Supply voltage to solenoid: approx. battery voltage (~12 V) when energized — confirm with OEM spec
Control method: solenoid typically switched to ground by module or switched +12 V depending on vehicle — confirm wiring
Typical solenoid coil resistance (ballpark): low ohms (single- or double-digit Ω range); check OEM spec
Evaporator temperature thermistor: NTC type — resistance decreases as temperature increases; typical order of magnitude 1 kΩ–10 kΩ at room temp (consult OEM spec)
Expected response: solenoid should click and draw current when commanded; no click + correct voltage → internal actuator fault or mechanical seize

Diagnostic algorithm

Safety and setup: Park vehicle on level ground, ignition OFF, chock wheels, and disconnect battery only if performing connector repairs per workshop procedures.
Scan tool: Read all fault codes and note freeze frame and module that reported B2810. Identify whether code originates from body/air suspension module or HVAC module.
Actuation test: Use diagnostic tool to command the vent solenoid. Listen for a click and observe suspension behavior. If solenoid does not react, continue electrical checks.
Inspect connectors: Visually inspect and disconnect the solenoid connector. Check for corrosion, bent pins or water intrusion and repair as needed.
Voltage/ground check: With connector back-probed, command solenoid and measure supply voltage and switching/ground signal at connector. Compare to battery voltage and expected switching behavior.
Coil resistance: With ignition OFF and connector disconnected, measure solenoid coil resistance. Compare to OEM spec — an open or shorted coil indicates replacement.
Wiring continuity: If supply/ground missing or intermittent, trace wiring to module. Check for continuity, shorts to ground/power, and repair/replace damaged sections.
Module and fuses: Check relevant fuses and module grounds. If wiring and solenoid test OK but no driver signal, test or replace control module or repair driver circuit per service manual.
HVAC thermistor check (if relevant): Remove or back-probe evaporator thermistor and measure resistance at a known ambient temperature. Compare to expected NTC curve from OEM. Replace sensor if out of range or open/shorted.
Clear codes and test drive: After repair, clear DTCs and cycle system through a few suspension and HVAC operations. Re-scan to confirm code does not return and verify normal operation.

Likely causes

Damaged harness or chafed wire to vent solenoid
Corroded connector at solenoid or module
Failed solenoid coil (open or shorted)
Blown fuse or faulty relay feeding solenoid circuit
Faulty evaporator thermistor (NTC) or incorrect resistance reading
Failed control module driver stage

Fault status

⚠️ Status

B2810 — Air suspension vent solenoid circuit failure reported. May also be associated with an evaporator temperature thermistor fault if logged by HVAC. Check wiring, connectors, fuses, actuator coil, and control module before replacing components.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.5 hours

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B2810 — Air suspension vent solenoid - circuit failure Fault in the evaporator temperature thermistor evaporator temperature thermistor