Four wheel drive low range indicator circuit fault
What it means
B0780. Four wheel drive low range indicator circuit fault. The transfer case control module cannot confirm the low range selection 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
- Faulty four wheel drive low range select switch
- Open or short in the four wheel drive low range indicator circuit
- Corroded transfer case select switch connector
- Faulty transfer case shift control module
- Sticking four wheel drive low range selector keeping the switch from confirming
Standard procedure
- Confirm the code with a scan tool
- Inspect the four wheel drive low range select switch and its connector
- Test the four wheel drive low range indicator circuit for opens and shorts
- Command the low range indicator with the scan tool and watch the lamp
- Replace the select switch or transfer case shift control module only after circuit tests pass, then clear the code and retest
Look up another code
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Sources and review
Review: checked against the recorded source material.
- B0780 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 B0780
Fetched directly. B0780 reads "Four Wheel Drive Low Range Indicator Circuit".
- Code B0780 meaning and causes | OBDII.pro
live reference page (obdii.pro)
Supports: independent corroboration of the GM meaning
Fetched directly. obdii.pro is a separate publisher and gives the GM meaning as: 4LO indicator circuit malfunction More details about the error B0780 and possible reasons for its occurrence.
Last updated 2026-10-10.
Report a correction for B0780. Include your vehicle, the issue and a source if you have one.