BMW DTC P1668 – EWS (Electronic Immobilizer) Start Value Destroyed
DTC P1668 meaning on BMW
DTC P1668 on a BMW refers to an issue with the Electronic Immobilizer system, specifically indicating that the Start Value has been destroyed. The Electronic Immobilizer system is designed to prevent unauthorized starting of the vehicle by disabling the engine’s ability to run without the correct key or signal.
BMW DTC P1668 symptoms
Symptoms of DTC P1668 on a BMW may include the engine not starting, the engine starting and then immediately stalling, or the engine cranking but not firing up. Additionally, the immobilizer warning light on the dashboard may be illuminated.
BMW DTC P1668 causes
The causes of DTC P1668 on a BMW can vary, but common reasons include issues with the key fob, a faulty immobilizer module, wiring problems, or a malfunction in the EWS (Electronic Immobilizer) system itself.
BMW DTC P1668 seriousness
DTC P1668 is a serious issue as it can prevent the vehicle from starting or running properly. If left unresolved, it can lead to inconvenience and potential safety concerns if the vehicle fails to start when needed.
How to diagnose DTC P1668 on BMW
To diagnose DTC P1668 on a BMW, a diagnostic scan tool capable of reading BMW-specific fault codes is needed. The technician will scan the vehicle’s ECU to retrieve the fault code and then proceed with further testing to pinpoint the exact cause of the issue.
How to fix DTC P1668 on BMW
Fixing DTC P1668 on a BMW may involve reprogramming the key fob, replacing the immobilizer module, repairing any wiring issues, or resetting the EWS system. It is recommended to consult with a qualified automotive technician or BMW specialist to accurately diagnose and resolve the problem.
How to erase DTC P1668 on BMW
To erase DTC P1668 on a BMW, the fault code can be cleared using a diagnostic scan tool. Once the underlying issue has been addressed and fixed, the technician can clear the fault code from the ECU memory, allowing the vehicle to operate normally 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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