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Service power steering message

Posted: Fri Oct 19, 2018 8:20 pm
by erikven96
I began to get "Service Power Steering" messages a couple of days ago on my 2012 Volt. The weird thing is that the warning comes on and I lose the power assist only when I drive uphill. Once the road levels out or going downhill the message is gone and and the power assist is back. I thought it was a low power steering fluid issue, but apparently there is no such thing in Volts.
Anybody has any idea what might be going on ?