DTC codes / Mazda codes / P1387
P1387 on a Mazda indicates that the powertrain control module (PCM) has detected an electrical fault in the circuit for camshaft position timing solenoid 2, which is the oil control valve that adjusts camshaft timing on the affected bank. The PCM monitors the solenoid's command circuit for expected voltage or current and sets the code when the signal falls outside the normal range.
Guidance is general and written for Mazda vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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