BMW DTC P1504 – Idle-Speed Control Valve Closing Solenoid Control Open Circuit
DTC P1504 meaning on BMW
DTC P1504 on a BMW indicates an open circuit in the control circuit of the idle-speed control valve closing solenoid. This means that the Engine Control Module (ECM) is unable to control the operation of the idle-speed control valve effectively.
BMW DTC P1504 symptoms
Symptoms of DTC P1504 on a BMW may include:
- Engine stalling at idle
- High or fluctuating idle speed
- Poor acceleration response
- Check Engine Light (CEL) illuminated on the dashboard
BMW DTC P1504 causes
The common causes of DTC P1504 on a BMW are:
- Faulty idle-speed control valve closing solenoid
- Open or short circuit in the wiring harness
- Corrosion or poor connections in the electrical connectors
- Defective Engine Control Module (ECM)
BMW DTC P1504 seriousness
DTC P1504 should not be ignored as it can lead to drivability issues and potential engine damage if left unresolved. It is recommended to address this issue promptly to ensure proper engine performance and reliability.
How to diagnose DTC P1504 on BMW
To diagnose DTC P1504 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes stored in the ECM
- Inspect the wiring harness and connectors for any visible damage or corrosion
- Test the idle-speed control valve closing solenoid for proper operation
- Check the ECM for any signs of malfunction
How to fix DTC P1504 on BMW
To fix DTC P1504 on a BMW, the following steps may be taken:
- Replace the faulty idle-speed control valve closing solenoid
- Repair any open or short circuits in the wiring harness
- Clean or replace any corroded electrical connectors
- If necessary, replace the Engine Control Module (ECM)
How to erase DTC P1504 on BMW
After fixing the underlying issue causing DTC P1504 on a BMW, the fault code can be erased using a diagnostic scanner. This will clear the code from the ECM’s memory and turn off the Check Engine Light. It is important to ensure that the repair has been successful before clearing the fault code.
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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