B048C
Humidity sensor humidity circuit fault
What it means
B048C. Humidity sensor humidity circuit fault. The HVAC module cannot read the windscreen humidity level 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 humidity sensor at the windscreen
- Open or short in the humidity sensor signal circuit
- Corroded humidity sensor connector
- Moisture or contamination on the humidity sensor element
- Faulty humidity 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 signal circuit for opens and shorts
- Compare live humidity data against a known good sensor
- Replace the humidity sensor only after circuit tests pass, then clear the code and retest
Look up another code
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Sources and review
Review: qualified. Read the source limits below.
- B048C 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 B048C
Fetched directly. B048C reads "Humidity Sensor Humidity Circuit".
Last updated 2026-10-10.
Report a correction for B048C. Include your vehicle, the issue and a source if you have one.