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Home › Mazda › 2003 › MX-5 Miata Base, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics › Diagnostic Tests › DTC P0850: Neutral Switch Input Circuit Malfunction › Possible Causes

Possible Causes

Neutral switch malfunction.
Open or short in wiring between neutral switch and PCM.
Open or short in wiring between neutral switch and ground.
PCM malfunction.