4WD System - Lamp ON/System Inop/DTC C0378
Bulletin No.: 07-04-19-001ADate: June 04, 2007
ENGINEERING INFORMATION
Subject:
EI07113 - Intermittent/Inoperative Four Wheel Drive, Service 4WD System Lamp On and DTC C0378 - Front Axle Switch Circuit Signal Invalid
Models:
2007 Chevrolet Avalanche, Suburban, Tahoe
2007 GMC Yukon, Yukon XL
with 246EAU Transfer Case (RPO NP8)
Supercede:
This bulletin is being issued to cancel Corporate Bulletin Number 07-04-19-001 and end the request for Engineering Information (EI07113). Please discard Corporate Bulletin Number 07-04-19-001 (Section 04 - Driveline/Axle).
Resolution
Through the information gained from this service bulletin, a series of incremental engineering changes are being reviewed with the calibration and the appropriate action will be taken to address this concern. Thank You to all those who offered your time and valuable assistance in support of this effort.
Instructions
If a customer brings in a vehicle with one of these concerns, no special action is required. Follow the normal diagnostic procedures in SI.
Disclaimer