B0130

Code

HUMMER B — Body

Air Temperature/Mode Door Actuator Malfunction

Brand: HUMMER

Type: B — Body

Views: UK: 10 EN: 17 RU: 13

AI status

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Page language: EN

Causes

Failed blend/temperature or mode door actuator motor
Damaged actuator gears or internal mechanical failure
Broken or binding HVAC door linkage or obstructions in ductwork
Open/shorted wiring, poor connector pin contact or corrosion
Blown fuse or poor ground at actuator
Faulty HVAC control module or incorrect calibration/learn state

Symptoms

Inability to change cabin temperature or temperature stuck at one range
Airflow stuck to one vent mode (floor/defrost/front vents) or does not switch
Clicking or grinding noise from dash when HVAC changes modes
Slow or no movement of doors when cycling HVAC modes
DTC B0130 stored and possible HVAC warnings on dash

What to check

Retrieve stored DTCs and freeze-frame data with a capable scan tool; note whether multiple HVAC actuator codes are present
Listen for clicking or motor noise from behind dash while commanding mode/temperature changes
Visually inspect actuator connectors, wiring harness, and dash area for damage or pin corrosion
Check related fuses and ground points for security and corrosion
Attempt to actuate door using scan tool bi-directional commands or manual movement (with power removed) to verify mechanical freedom

Signal parameters

Supply voltage to actuator: battery voltage (~11–14.5 V) when powered
Position feedback signal (common): typically 0.5–4.5 V (varies with door position) on potentiometer-style actuators
Control signal (motor/PWM) frequency: varies by design (may use DC drive or PWM in 20–200 Hz range)
Expected actuator current draw: idle/operating ~0.1–0.5 A; stall/current spike typically under 2–3 A (manufacturer-specific)
Connector pin continuity: near 0 Ω to ground for ground pin; 5 V reference (if present) at ~5 V

Diagnostic algorithm

Verify customer complaint and note when symptom occurs (cold start, continuous, intermittent).
Connect a scan tool and read/record all HVAC/body codes. Clear codes, then re-run to confirm persistence.
Command the air temperature and mode doors from the scan tool while listening and watching actuator movement. Note response and any clicking.
If actuator does not respond, backprobe the actuator connector during a command: verify battery voltage on supply, good ground, and presence/behavior of control/feedback signals (voltage changes or PWM).
If supply and ground are present but feedback is absent or incorrect, disconnect actuator and measure actuator internal resistance and potentiometer output (if present). Compare to expected ranges or known-good actuator values.
Inspect actuator for stripped gears or mechanical binding by removing it and manually moving the door to check freedom of movement. Check for obstructions in ductwork.
Inspect wiring harness and connector for corrosion, bent pins, or broken wires; wiggle test while commanding to reproduce fault.
If actuator is electrically dead or feedback out of range, replace the actuator. If wiring or connector is faulty, repair and retest.
After repair or replacement, perform actuator calibration/learn procedure if required by vehicle, clear codes, then verify proper operation through full range and road test.
If actuator and wiring test good but fault returns, suspect HVAC control module failure and proceed to module-level diagnostics per manufacturer procedures.

Likely causes

Actuator electrical failure (motor or potentiometer feedback)
Stripped plastic gears inside actuator causing intermittent movement
Wiring harness damage where it flexes (near dash or door hinges)
Connector corrosion or pin pushed out at actuator connector
HVAC module software or lost actuator position learn

Fault status

⚠️ Status

B0130 — Air Temperature/Mode Door Actuator Malfunction. The HVAC control module has detected incorrect or no response from the temperature or mode door actuator (position feedback out of range, no movement, or electrical fault).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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