B127E GMC Possible Causes
- Faulty Front Video Display
- Front Video Display harness is open or shorted
- Front Video Display circuit poor electrical connection
- Faulty Human Machine Interface Control Module
How is the B127E GMC code repair?
Start by checking 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.Tech Notes
When a DVD is playing on the front radio display B127E will set as a false current code. Please ignore TC B127E unless the code stays current after ejecting the DVD.What is the cost to diagnose the B127E GMC code
Labor: 1.0
The cost to diagnose the B127E GMC code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B127E GMC Meaning
The infotainment display and controls are a separate component from the radio, combined into an assembly. The assembly is supplied battery voltage and ground from the vehicle harness. The Human Machine Interface Control Module communicates digital video data for on-screen display through a dedicated cable containing the LVDS data circuits.Control information, touch communications and dimming level for the display are communicated via a LIN serial data circuit to the Human Machine Interface Control Module.
If the Human Machine Interface Control Module detects the display is not responding to the output on the LVDS circuits, the Human Machine Interface Control Module sets the Diagnostic Trouble Code (DTC).
More Information
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