BMW DTC P1656 – EWS (Electronic Immobilizer) Wrong Code
DTC P1656 meaning on BMW
DTC P1656 on a BMW refers to a fault with the Electronic Immobilizer system, specifically indicating a wrong code being detected. The Electronic Immobilizer system is designed to prevent unauthorized starting of the vehicle by disabling the engine unless the correct key is used.
BMW DTC P1656 symptoms
Symptoms of DTC P1656 on a BMW may include the engine not starting, the engine starting and then immediately shutting off, or the immobilizer warning light illuminating on the dashboard.
BMW DTC P1656 causes
The causes of DTC P1656 on a BMW can vary, but common reasons include issues with the key transponder, a faulty immobilizer control module, wiring issues, or a mismatch between the key and the immobilizer system.
BMW DTC P1656 seriousness
DTC P1656 is a serious issue as it can prevent the vehicle from starting or cause it to shut off unexpectedly. It is important to address this fault promptly to ensure the vehicle’s security and functionality.
How to diagnose DTC P1656 on BMW
To diagnose DTC P1656 on a BMW, a diagnostic scan tool capable of reading BMW-specific fault codes is needed. The technician will scan the vehicle’s computer system to retrieve the fault code and then perform further testing to identify the root cause of the issue.
How to fix DTC P1656 on BMW
Fixing DTC P1656 on a BMW may involve reprogramming the key, replacing the key transponder, repairing wiring issues, or replacing the immobilizer control module. The exact repair will depend on the specific cause identified during the diagnostic process.
How to erase DTC P1656 on BMW
Once the underlying issue causing DTC P1656 on a BMW has been resolved, the fault code can be erased using a diagnostic scan tool. The technician will clear the code from the vehicle’s computer system, allowing the immobilizer system to function properly again.
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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