A code is a clue, not a verdict.
A diagnostic trouble code records a condition the vehicle detected. It can identify the system, circuit, or behavior that needs investigation, but it does not by itself prove which part failed.
The same code can have more than one possible cause. Wiring, connections, power, ground, inputs, outputs, mechanical conditions, software, and the component itself may all need to be considered.
The Your New Mechanic standard
Parts are not recommended solely because a customer, another person, or a code description says they need replacement.
The appropriate tests depend on the vehicle and concern. Useful evidence may include scan data, circuit measurements, waveform captures, physical inspection, commanded tests, or comparison with known operating behavior.
What happens next
Finding the problem is part of the professional work purchased through a Service Slot. When the evidence supports a repair and the next work fits the remaining capacity, authorization, parts, and conditions, we keep moving. Otherwise, the work establishes a documented next step.