What does code P1556 mean on BMW vehicles?
The ECU detects an open circuit in the VANOS actuator A control circuit on Bank 1.
OBD-II Code BMW
P1556 — BMW — A Camshaft Position Actuator Control Open Circuit Bank 1
The ECU detects an open circuit in the VANOS actuator A control circuit on Bank 1.
Common symptoms
- Loss of power
- poor engine response
Possible causes
- Electrical failure in actuator circuit
Initial recommendation
Inspect VANOS wiring harness and restore proper electrical continuity.
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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