B048F
Humidity sensor temperature circuit fault
What it means
B048F. Humidity sensor temperature circuit fault. The HVAC module cannot read the windscreen sensor temperature and the body warning light comes on.. This Chevy-enhanced code applies to Chevrolet, GMC, Buick, Cadillac, Pontiac, Oldsmobile and Saturn models that use this code.
Findings, check these first
- Failed temperature element in the windscreen humidity sensor
- Open or short in the humidity sensor temperature circuit
- Corroded humidity sensor connector
- Moisture on the humidity sensor element
- Faulty temperature input in the HVAC control module
Standard procedure
- Confirm the code with a scan tool
- Inspect the windscreen humidity sensor and its connector
- Test the humidity sensor temperature circuit for opens and shorts
- Compare live sensor temperature against a known good sensor
- Replace the humidity sensor only after circuit tests pass, then clear the code and retest
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Sources and review
Review: qualified. Read the source limits below.
- B048F CHEVROLET Code: Meaning, Causes, and Symptoms | OBD2 Codes - OBD2 Codes
live reference page (obd2-codes.co)
Supports: CHEVROLET and GM-family meaning and likely causes for B048F
Fetched directly. B048F reads "Humidity Sensor Temperature Circuit".
Last updated 2026-10-10.
Report a correction for B048F. Include your vehicle, the issue and a source if you have one.