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OBD-II Code Mazda

P1602 — Mazda — Powertrain Control Module Communication Line to TCM Error

The PCM detects a communication error with the Transmission Control Module (TCM).

Brand Mazda
System Security System
Severity High
Safe to drive? Not recommended
Advanced scanner Yes

What does code P1602 mean on Mazda vehicles?

The PCM detects a communication error with the Transmission Control Module (TCM).

Common symptoms

  • Shift issues
  • abnormal transmission behavior

Possible causes

  • Network communication fault
  • CAN bus issue

Initial recommendation

Inspect CAN wiring and verify PCM-TCM communication integrity.

Safety notice

This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.

Analyze this code with MecaOBD

Use the app to combine Mazda code P1602 with your vehicle's actual symptoms for more complete diagnostic guidance.

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