Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1370 (HVAC SYSTEM - AUTOMATIC)DIAGNOSTIC INFORMATION AND PROCEDURESAIR TEMPERATURE MALFUNCTIONCIRCUIT/SYSTEM TESTINGSUNLOAD SENSOR CIRCUIT MALFUNCTION
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2
Sunload Sensor Circuit Malfunction
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Sunload Sensor Circuit Malfunction
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the sunload sensor.
- Ignition OFF, test for less than 10 ohms of resistance between the low reference circuit terminal C and ground.
- If greater than the specified range, test the ground circuit for high resistance.
- Ignition ON, test for 4.8-5.2 volts between the low reference circuit terminal C and the appropriate signal circuit terminal.
- Left sunload sensor circuit terminal A.
- Right sunload sensor circuit terminal B.
- If less than the specified range, test the signal circuit for high resistance. If the circuit tests normal, replace the HVAC control module.
- If all circuits test normal, test or replace the sunload sensor.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.