Code
B0269
HUMMER
B — Body
Air Inlet Door Range Error
AI status
Completed
Completed
100%
Causes
- Failed or weak air inlet/recirculation door actuator (motor or stepper)
- Damaged or worn actuator gears or linkage
- Blocked or binding air inlet door (debris, ice, broken duct)
- Faulty position sensor or feedback potentiometer in the actuator
- Corroded, loose or damaged wiring connector or short/open circuit
- HVAC control module / body control module software or internal fault
Symptoms
- Unable to switch between fresh air and recirculate modes
- HVAC displays incorrect mode or shows an HVAC fault message
- Air inlet door does not move or moves intermittently
- Unusual clicking or grinding noise from dash when changing modes
- Persistent HVAC DTCs after clearing codes
- Inability to get desired cabin air source (outside air vs recirculation)
What to check
- Read HVAC/body codes with a scan tool and record freeze frame/live data
- Observe air inlet door position/feed back while commanding recirc and fresh modes
- Command actuator from scan tool and listen/watch for movement
- Visually inspect actuator, linkage, and duct for obstructions or broken gears
- Inspect connector for corrosion, bent pins, or water intrusion; wiggle test while commanding
- Check fuse(s) and ground(s for the HVAC/BCM circuits
Signal parameters
- Actuator supply: approx. 12 V when commanded (varies by vehicle)
- Position feedback: 0–5 V potentiometer range or 0–100% reported position in live data
- No feedback or a fixed value while commanding indicates sensor or wiring issue
- Intermittent voltage or noisy signal suggests poor connection or failing sensor
- Motor current may increase if actuator is stalled (use proper current probe or diagnostic tool)
Diagnostic algorithm
- Connect scan tool, read and record B0269 and any other HVAC/BCM codes and freeze frame/live data.
- Clear codes and attempt to reproduce. Command air inlet/recirc door open/close from the scan tool while watching live feedback.
- If actuator does not respond: inspect connector and wiring for damage, corrosion, and proper mating. Repair any harness faults.
- If wiring is good, apply 12 V (or follow manufacturer procedure) to actuator motor connector to confirm movement. If actuator fails to move, replace actuator.
- If actuator moves when bench-tested but not in-vehicle, backprobe connector while commanding to check for correct control voltage and ground. Repair wiring or module output as needed.
- If feedback signal is out of expected range or noisy, replace actuator (contains position sensor) and retest.
- Inspect duct and door for mechanical interference. Repair or replace broken linkage or clear debris.
- After repairs, perform HVAC actuator calibration/relearn with scan tool per service procedure and confirm proper operation and that the code does not return.
- If fault persists after actuator and wiring checks, consider HVAC control module/BCM diagnostics or software update per manufacturer guidance.
Likely causes
- Faulty actuator (most common)
- Mechanical interference or broken linkage preventing full travel
- Connector corrosion or wiring fault to the actuator
- Position sensor inside actuator failed or out of range
Fault status
Status
Air inlet (recirculation) door position out of expected range — check actuator, wiring, and door movement.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Repair manuals
Manual library for HUMMER
138
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