Trouble codes and the OBD system are ONLY for emission related items. If something fails that only impact engine performance, but not emissions, a code will not be set.
Technically our cars don't have a "limp mode" BUT do have a "fail safe mode"
In the FSM under fail-safe will show what item is suspect depending on the engine RPM limit.
For example, if the engine won't rev above 3,500 RPM there is an issue with the VVEL system.
Was there a specific RPM the engine was limited to?
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