Code
B0184
HUMMER
B — Body
Solar Load Sensor #1 Circuit Range (sunload)
AI status
Completed
Completed
100%
Causes
- Failed or degraded solar load (sunload) sensor
- Open, short to voltage, or short to ground in the sensor signal wiring
- Corroded, loose, or damaged connector at the sensor or control module
- Water intrusion or contamination of the sensor or connector
- Faulty HVAC/BCM/comfort control module input or internal harness fault
- Incorrect sensor position, obstruction, or replacement with wrong part
Symptoms
- Automatic climate control behaving incorrectly (over/under cooling)
- HVAC system ignoring sunload input or using default settings
- DTC B0184 stored and possibly an associated MIL or message in the dash
- Intermittent HVAC operation or sudden changes when vehicle is under sunlight
- Sensor area on dash may show water staining or obvious damage
What to check
- Read and record freeze frame and freeze data with a scan tool; note ambient conditions when code set
- Perform visual inspection of sensor, wiring, and connector for damage, corrosion, or water intrusion
- Verify sensor is correctly seated and not obstructed or mispositioned
- Use scan tool to view live sunload (solar) sensor value while changing lighting (cover/uncover sensor)
- Backprobe sensor connector to measure reference, signal, and ground voltages with ignition on
- Wiggle wiring harness and connector while watching live data for intermittent changes
Signal parameters
- Type: analog voltage-type sunload/solar sensor input to HVAC/comfort module
- Reference voltage: typically ~5 V supply (verify factory spec for vehicle)
- Expected signal range: approx. 0.5 V (low/quiet shade) to ~3–4.5 V (bright sun); values near 0 V or near supply may indicate open/short
- Open-circuit symptom: signal may float toward supply or 0 V depending on circuit design
- Intermittent: rapid jumps or noise on signal when sensor is flexed or connector moved
Diagnostic algorithm
- Use a scan tool to confirm B0184 and check for related codes (other sunload/ambient sensor codes). Note freeze frame and live data.
- Visually inspect the solar sensor location (usually on dash near windshield) and the connector for contamination, crushed wires, or damage.
- With ignition ON (engine may be off), backprobe the sensor connector. Verify reference supply (≈5 V), ground, and signal voltage. Record values in shade and in bright light or while covering/uncovering the sensor to see a response.
- If reference or ground missing, trace and repair supply or ground circuit to the HVAC/comfort module.
- If signal is stuck high/low or does not respond to changes in light, disconnect the sensor and measure open-circuit at module harness. If harness shows correct response when sensor is disconnected, replace sensor.
- Inspect and continuity-test the wiring between sensor and control module. Repair any short, open, or damaged wires. Check for short to battery or ground if signal is pegged at supply or 0 V.
- If wiring and sensor test good but code persists, substitute a known-good sensor (if available) or replace sensor and retest.
- If problem still present after sensor and wiring repair, suspect HVAC/comfort control module input fault; verify with module bench diagnostics or consult service manual for module testing and reprogramming.
- After repair, clear codes, perform any required system relearn/calibration per OEM procedure, and verify proper operation over varied lighting conditions.
Likely causes
- Damaged sensor or contaminated connector at dash-mounted solar sensor
- Broken or shorted signal wire between sensor and HVAC control module
- Connector corrosion or water-damaged wiring at sensor
- Control module input fault (less common)
Fault status
Status
DTC B0184 — Solar Load Sensor #1 Circuit Range (sunload): Sensor signal out of expected range (open/short/invalid voltage). Inspect sensor, wiring, and control module input.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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