It indicates a fault in the transmission. You need to take it to a shop to have it diagnosed, just like the manual says.
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There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
Your washer fluid is low, or the indicator is stuck. The washer bottle would have to be removed and checked.
walmart
dash dash
Usually on the dash to the right of the steering wheel.
On the brake pedal assembly.
With an OBD2 scanner.
Just unscrew it.
If the o2 sensor is bad, replace it. If the sensors are activating the check engine light, then the codes should be checked. The catalytic converter could be blocked or the engine may not be running properly.
You may be low on brake fluid. If you are low on brake fluid you may be ready for some brake work or you have a leak somewhere in the system, have it checked soon!
Have vehicle scanned to determine the problem