B048E
Auxiliary heater system malfunction
What it means
B048E. Auxiliary heater system malfunction. The electric auxiliary heater does not deliver the requested heat 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 heating element in the electric auxiliary heater
- Open in the auxiliary heater power feed
- Corroded auxiliary heater connector
- Failed auxiliary heater control driver
- Restricted airflow over the auxiliary heater
Standard procedure
- Confirm the code with a scan tool
- Check the auxiliary heater fuse and power feed
- Inspect and reseat the auxiliary heater connector
- Command the auxiliary heater and compare commanded to delivered temperature
- Replace the electric auxiliary heater only after circuit tests pass, then clear the code and retest
Look up another code
Press / to jump to the box. Chevy-enhanced powertrain, body, chassis and network codes.
Sources and review
Review: qualified. Read the source limits below.
- B048E 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 B048E
Fetched directly. B048E reads "Auxiliary Heater System Malfunction".
Last updated 2026-10-10.
Report a correction for B048E. Include your vehicle, the issue and a source if you have one.