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Home >> Mazda >> 2002 >> MX-5 Miata Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1601: Pcm-TCM Communication Line Error >> Possible Cause

Possible Cause

Poor connection at PCM and TCM.
Open or short circuit between PCM and TCM.
PCM malfunction.
TCM malfunction.

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