What does code P1634 mean on Mazda vehicles?
The ECU detects an open circuit at the alternator B (battery) terminal.
OBD-II Code Mazda
P1634 — Mazda — Generator Terminal B Circuit Open
The ECU detects an open circuit at the alternator B (battery) terminal.
Common symptoms
- Battery not charging
Possible causes
- Open wiring
- poor connection
Initial recommendation
Inspect alternator B terminal wiring and repair open circuit.
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
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