My 2011 BMW 328i has the "service engine soon" light showing and codes pulled were P1775 and 1777. Can you tell me what I need to do to fix this?
My car has 91500 miles.
My car has an automatic transmission.
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Hi Ronnie. Thanks for contacting us today. There are multiple components that could be causing these codes. The P1777 code is a BMW specific trouble code that indicates a possible problem with the transmission step motor. This component changes the step with turning 4 coils ON/OFF according to the signal from Transmission Control Module (TCM). As a result, the flow of line pressure to primary pulley is changed and pulley ratio is controlled. The issue could be the motor, the electrical harness or just a faulty connection. The P1775 code typically indicates a communication problem or no data exchange between ECM and TCM because of internal fault in the switch. It’s also caused by a failure of the crank sensor. Since there are multiple components that could be causing these codes, it’s hard to provide an estimate for repair. You might want to have a professional mechanic diagnose the problem first by completing a check engine light inspection.
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