What does code P1400 mean on BMW vehicles?
The ECU detects insufficient voltage or current supplied to the heated catalytic converter on Bank 1 during warm-up.
OBD-II Code BMW
P1400 — BMW — Heated Catalyst Battery Voltage or Current Too Low During Heating (Bank 1)
The ECU detects insufficient voltage or current supplied to the heated catalytic converter on Bank 1 during warm-up.
Common symptoms
- Reduced catalytic efficiency
- emissions increase
Possible causes
- Electrical supply issue
- wiring or control circuit fault
Initial recommendation
Check power supply, wiring, and control circuit for heated catalyst.
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.
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