Transmission malfunction after alternator replacement

Hi,

Is the shift indicator showing the correct gear selection? Also, is the check engine light staying on when the engine runs?

I have to ask, was the alternator bad? You indicated the pulley broke.

I checked through my manual, and there is a section specific to this message. It indicates a problem with either the body control module (BCM) or the transmission control module (TCM). The alternator shouldn't have affected either of those unless it was over charging.

First, I need you to check two fuses in the under hood fuse box. Fuses F15 and F41. See pic 2 below for location. Here are a few links you may find helpful:

https://www.2carpros.com/articles/how-a-car-fuse-works

https://www.2carpros.com/articles/how-to-check-a-car-fuse

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

If the fuses are good, here is the test procedure which requires specialized tooling. The pic attached is the actual diagnostic flow chart. I realize this is something you may not be comfortable with, but wanted to add it so you could see what will need done.

2013 Ford Focus L4-2.0L Turbo
Pinpoint Tests BK: A Transmission Malfunction Display Is Never Or Always ON
Vehicle Instrument Panel, Gauges and Warning Indicators Testing and Inspection Pinpoint Tests Instrumentation, Message Center and Warning Chimes Pinpoint Tests BK: A Transmission Malfunction Display Is Never Or Always ON
PINPOINT TESTS BK: A TRANSMISSION MALFUNCTION DISPLAY IS NEVER OR ALWAYS ON
Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

A Transmission Malfunction Display Is Never Or Always On

Diagnostic Overview

Diagnostics assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods See: Vehicle > Initial Inspection and Diagnostic Overview > Diagnostic Methods (General Information). See: Vehicle > Initial Inspection and Diagnostic Overview

Normal Operation and Fault Conditions

See Transmission Malfunction Displays.
REFER to: Message Center - System Operation and Component Description See: Instrument Panel, Gauges and Warning Indicators > Components > Message Center - System Operation and Component Description (Instrument Panel, Gauges and Warning Indicators).

Possible Sources

- TCM (transmission control module)

- BCM (body control module)

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Let me know what you find with the fuses. Also, if you have other questions, please feel free to ask.

Take care,
Joe