DTC codes / P08xx · Transmission / P0817
P0817 means the powertrain control module (PCM) has detected a fault in the starter disable circuit, which is the path that prevents the engine from cranking when the vehicle is not in Park or Neutral. The PCM monitors the circuit for unexpected voltage or continuity and sets this code when the signal does not match the commanded state.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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