Device Voltage Reference Input Circuit
Table of contents
B1390 GMC Possible Causes
- Faulty Body Control Module (BCM)
- Body Control Module (BCM) harness is open or shorted
- Body Control Module (BCM) circuit poor electrical connection
How do I fix code B1390 GMC?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the B1390 GMC code
The cost of diagnosing the B1390 GMC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B1390 GMC Description
The Body Control Module (BCM) has an internal precision battery voltage sensor connected to a dedicated battery positive voltage and dedicated ground. The BCM then compares the voltage of the sensors to the battery positive voltage. The Diagnostic Trouble Code (DTC) B1390 will set if these voltages are different by greater than 2 volts.