GM: Power Steering Noise/Leaks from Power Steering Pump, Gear or High Pressure Hose During Extreme Low Temperature Conditions
-2009-2015 Buick LaCrosse (Equipped with Hydraulic Power Steering)
-2010-2013 Buick Regal
-2012-2015 Buick Enclave
-2013-2015 Buick Encore (Equipped with RPO N40 Hydraulic Power Steering)
-2007-2014 Cadillac Escalade
-2009-2015 Cadillac SRX
-2013-2015 Cadillac XTS
-2007-2014 Chevrolet Avalanche, Silverado 1500, Suburban 1500, and Tahoe (Equipped with Hydraulic Power Steering)
-2010-2015 Chevrolet Equinox (V6 Only)
-2011-2015 Chevrolet Silverado 2500/3500
-2012-2015 Chevrolet Traverse
-2013 Chevrolet Caprice PPV
-2007-2014 GMC Sierra 1500, Yukon Models (1500 Series Only)
-2010-2015 GMC Terrain (V6 Only)
-2011-2015 GMC Sierra 2500/3500
-2012-2015 GMC Acadia
CONDITION: The information contained in this bulletin applies only to the models listed. DEXRON HP fluid cannot be used in any other GM product’s power steering system. Some customers may comment that their vehicle is experiencing a power steering noise/whine or fluid leak from the power steering pump, gear or high-pressure power steering hose during extremely low outdoor temperature operation. This bulletin replaces Bulletin Number 12-02-32-002, as DEXRON HP fluid has improved cold temperature characteristics over the former cold temperature fluid.
CAUSE: During extremely low temperatures, -35°C (-31°F) or lower (usually in the -40°C/F or less range), the power steering fluid may thicken and the power steering system pressures may rise, causing damage to various components.
SOLUTION: To resolve this condition, replace any damaged power steering system components. Refer to power steering service information for diagnosing and repairing steering system component fluid leaks. After the leaks are fixed, flush the power steering system and refill with DEXRON HP fluid.
Courtesy of ALLDATA.