Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Trouble Code (DTC) Information FSM-U201A51
Condition
Forward Sensing Module (FSM) checks the software in the control module. The control module is pre-loaded with standard files from the factory. After replacing control module, new software must be downloaded.
- The DTC is initially set and erased first after completed software download.
The control module's test for the diagnostic trouble code (DTC) starts in the event of:
- Ignition switch position II.
- Control module supplied with power for at least 5 seconds.
The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.