The crash happened just before 9:00 a.m. on Valley Center Road south of State Route 76.
Witnesses told CHP investigators that the sheriff's deputy was traveling northbound, when the female driver made a left turn in front of him.
"As you can see, there was a pretty horrific impact. The party that was making a left turn into the intersection...her vehicle was actually pushed backward for several feet before it came to rest," explained Brad Denhem with the California Highway Patrol.
CHP officers say both victims are expected to fully recover.
Valley Center road has been re-opened, after being shut down in both directions for nearly three hours after the crash.
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