BMW DTC P1556 – Air Conditioning Compressor Circuit Low (S54 to 09/00: ‘A’ Camshaft Position Actuator Control Circuit/Open (Bank 1)
DTC P1556 meaning on BMW
DTC P1556 on a BMW refers to the ¨Air Conditioning Compressor Circuit Low¨ or ¨A Camshaft Position Actuator Control Circuit/Open (Bank 1)¨ fault code. This diagnostic trouble code indicates an issue with the air conditioning compressor circuit or the camshaft position actuator control circuit on Bank 1 of the engine.
BMW DTC P1556 symptoms
Symptoms of DTC P1556 on a BMW may include:
- Malfunctioning air conditioning system
- Engine running rough or misfiring
- Reduced engine performance
- Illuminated check engine light
BMW DTC P1556 causes
Common causes of DTC P1556 on a BMW include:
- Faulty air conditioning compressor
- Issues with the camshaft position actuator control circuit
- Wiring or connector problems in the circuit
- Faulty sensors related to the circuit
BMW DTC P1556 seriousness
The seriousness of DTC P1556 on a BMW depends on the underlying cause. Ignoring this fault code can lead to further damage to the air conditioning system or engine performance issues. It is recommended to address this code promptly to prevent potential complications.
How to diagnose DTC P1556 on BMW
To diagnose DTC P1556 on a BMW, follow these steps:
- Use a diagnostic scanner to retrieve the fault code and freeze frame data.
- Inspect the air conditioning compressor circuit and related components for any visible damage or loose connections.
- Check the camshaft position actuator control circuit on Bank 1 for continuity and proper operation.
- Test the sensors and wiring associated with the circuit for any faults.
How to fix DTC P1556 on BMW
To fix DTC P1556 on a BMW, consider the following:
- Repair or replace any damaged components in the air conditioning compressor circuit.
- Address any issues with the camshaft position actuator control circuit on Bank 1.
- Repair or replace faulty sensors or wiring related to the circuit.
- Clear the fault code and test the system to ensure the issue has been resolved.
How to erase DTC P1556 on BMW
To erase DTC P1556 on a BMW, use a diagnostic scanner to clear the fault code from the vehicle’s memory. After fixing the underlying issue causing the fault code, clearing it from the system will reset the check engine light and ensure the repair was successful.
Recommended tools & DTC Scanners for BMW
Best Diagnostic App for modern BMWs: BimmerLink
Recommended Bluetooth adapter for Bimmerlink: OBDLink CX
Cable adapter for Bimmerlink: Enet Cable USB Type C
For older BMWs we recommend: Autel AutoLink AL319 (2024 version)
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
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