Musty Odor After Rain in 2020 Chevrolet Silverado 1500
A musty smell after rain typically indicates moisture accumulation in the cabin, often due to clogged A/C drain tubes, wet cabin air filter, or water intrusion from seals or sunroof drains.
Diagnosis Details
Possible Causes
Clogged A/C evaporator drain tube causing water to pool and grow mold/mildew
Wet or contaminated cabin air filter trapping moisture and odors
Leaking door seals, windshield seal, or sunroof drains allowing rainwater into the carpet or insulation
Related OBD-II Codes
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What You Should Do
Check and clear the A/C drain tube under the vehicle; inspect and replace the cabin air filter if damp or dirty; examine carpets, floor mats, and under-seat areas for moisture; test door and window seals for leaks; if sunroof equipped, clean drain tubes.
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Estimated Repair Cost
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Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.