PI-1191

SB-10055391-2920
File in Section:
Service Bulletin
Bulletin No.:
Date:
PI1191
March, 2014
PRELIMINARY INFORMATION
Subject:
Service Power Steering and Service Hybrid System Messages After Cold Soak in Cold
Ambient Temperatures
Models:
2009-2013 Cadillac Escalade Hybrid
2009-2013 Chevrolet Tahoe Hybrid, Silverado Hybrid
2009-2013 GMC Sierra Hybrid, Yukon Hybrid
Condition/Concern
Some customers may comment on any of the following:
• Service Power Steering message displayed on the driver information center (DIC)
• Service Hybrid System message displayed on the driver information center (DIC)
• Charging System indicator lamp on
• Loss of power steering assist
• Loss of 12 volt battery power
These conditions may occur immediately after start up after a cold soak in cold ambient temperatures at
approximately -11°C to -20°C (12°F to -4°F).
When checking the vehicle for DTCs, the DC Converter Control Module may report U1821, U182A and C0895 active
or in history.
Recommendation/Instructions
Note: This concern can only be duplicated after a cold soak in extreme cold temperatures as noted above.
Engineering is aware of this concern and working on a part resolution. Once parts become available this PI will be
updated. Please DO NOT replace any power steering components as this will not correct the concern.
Customer Information
Please communicate to the customer that we apologize for this inconvenience and that General Motors is working
on a solution for this concern. Once a solution is available, this PI will be updated with additional details - allowing
dealership personnel to contact the customer to schedule a service appointment and repair the vehicle. In the
meantime customers should avoid this ambient temperature window (i.e. park in the garage, etc.) whenever
possible.