B1242

Code

LAND ROVER B — Body

recirculation door air flow actuator - circuit failure button

Brand: LAND ROVER

Type: B — Body

Views: UK: 24 EN: 42 RU: 29

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Page language: EN

Causes

Blown fuse or poor power supply to HVAC/actuator circuit
Open or shorted wiring between actuator, recirculation switch and HVAC/BCM
Corroded, loose or damaged connectors at actuator or switch
Faulty recirculation door actuator (motor or internal position sensor)
Faulty recirculation switch or HVAC control unit (module) software/hardware fault
Body control module / HVAC control module intermittent or failed output

Symptoms

Recirculation mode does not engage or stays fixed in one position
HVAC recirculation button does not respond or indicator lamp does not change
Unusual noise from HVAC area when attempting to change recirculation position
Interior air quality issues (constant stale or smoky air) when recirculation fails
DTC stored and possible loss of automatic recirculation functionality

What to check

Read and record stored codes and freeze frame data with a diagnostic scanner
Operate recirculation button while monitoring live data for command/feedback
Visually inspect fuses related to HVAC and recirculation circuits
Inspect connectors and wiring at the actuator, recirculation switch and HVAC module for corrosion, looseness or damage
Listen for actuator movement when recirculation is commanded
Measure supply voltage and ground at the actuator connector with switch commanded

Signal parameters

Supply voltage to actuator: approx. 11–14 V when ignition on
Ground continuity to chassis ground expected near 0 Ω
Position sensor / feedback signal: low to high voltage change as actuator moves (typically 0.5–4.5 V depending on design)
Command from HVAC/switch: either switched 12 V or a low-voltage data/logic signal to the control module (varies by model)
Actuator stall/current draw: increases above idle when mechanically blocked (typical actuator currents up to ~1–2 A)

Diagnostic algorithm

Connect a capable diagnostic scanner, read all HVAC/body codes and note freeze frame/live data for recirculation status.
With ignition on, command recirculation on/off from the scanner and from the dash switch while observing live data and listening for actuator movement.
Visually inspect fuses and relays related to the HVAC/recirculation circuit; replace any blown fuses and re-test.
Inspect the actuator connector and wiring for corrosion, bent pins, broken wires or water ingress. Repair as required.
Back-probe actuator connector: verify battery voltage on the supply pin, good ground, and that feedback/position voltage changes when commanded.
If supply/ground are present but no movement, apply bench 12 V to the actuator (observing polarity and current draw) to confirm actuator motor function. Replace actuator if it does not operate or draws abnormally high current.
If actuator operates on bench but not when commanded, trace continuity between actuator connector and HVAC/control module; check for shorts to battery or ground and intermittent faults when harness is moved.
Test the recirculation switch input at the HVAC control module (or use module diagnostics) to verify the module is receiving the command. Replace switch or module only after verifying wiring and actuator are good.
Clear codes and perform a full function test. If code returns after wiring and actuator verified, consider HVAC control module diagnostics or replacement following manufacturer procedures.

Likely causes

Damaged wiring harness to the recirculation actuator connector (chafing, rodent, pinched)
Failed actuator motor or internal potentiometer/position sensor
Connector corrosion or water ingress at HVAC plenum
Blown fuse supplying the recirculation actuator/switch
Faulty recirculation switch or a module that is not sending/receiving the command

Fault status

⚠️ Status

B1242 — Recirculation door air flow actuator circuit failure (recirculation button). Electrical fault detected in actuator/switch circuit; function may be inoperative.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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B1242 — recirculation door air flow actuator - circuit failure button