BMW DTC P1655 – EWS (Electronic Immobilizer) Rolling Code Faulty Storage
DTC P1655 meaning on BMW
DTC P1655 on a BMW refers to the Electronic Immobilizer Rolling Code Faulty Storage. This fault code indicates an issue with the electronic immobilizer system, specifically related to the rolling code storage function.
BMW DTC P1655 symptoms
Symptoms of DTC P1655 on a BMW may include difficulty starting the vehicle, the engine not cranking, or the engine starting and then immediately stalling. The immobilizer system may also prevent the engine from starting altogether.
BMW DTC P1655 causes
The main cause of DTC P1655 on a BMW is a fault in the rolling code storage within the electronic immobilizer system. This could be due to a malfunction in the immobilizer control unit, a wiring issue, or a problem with the key transponder.
BMW DTC P1655 seriousness
DTC P1655 is a serious fault code as it can prevent the vehicle from starting or cause it to stall unexpectedly. It is important to address this issue promptly to ensure the proper functioning of the immobilizer system and the vehicle’s security.
How to diagnose DTC P1655 on BMW
To diagnose DTC P1655 on a BMW, a diagnostic scan tool capable of reading BMW fault codes is required. The technician will need to retrieve the fault code and then perform further testing to pinpoint the exact cause of the rolling code storage fault.
- Use a diagnostic scan tool to retrieve the fault code.
- Inspect the wiring and connections related to the immobilizer system.
- Test the key transponder for proper operation.
- Check the immobilizer control unit for any faults.
How to fix DTC P1655 on BMW
Fixing DTC P1655 on a BMW may involve repairing or replacing components within the electronic immobilizer system. The exact repair will depend on the specific cause of the rolling code storage fault.
- Repair or replace any damaged wiring or connections.
- Replace the key transponder if faulty.
- Repair or replace the immobilizer control unit if necessary.
- Reprogram the immobilizer system to ensure proper operation.
How to erase DTC P1655 on BMW
To erase DTC P1655 on a BMW, the fault code must be cleared using a diagnostic scan tool. Once the underlying issue has been addressed and fixed, the fault code can be cleared to reset the system.
- Connect a diagnostic scan tool to the vehicle’s OBD-II port.
- Select the option to clear fault codes from the system.
- Follow the on-screen prompts to erase the DTC P1655 code.
- Verify that the fault code has been successfully cleared.
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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