P1661 – BMW DTC

BMW DTC P1661 – Timeout EWS (Electronic Immobilizer)-Telegram

DTC P1661 meaning on BMW

The DTC P1661 code on a BMW refers to a Timeout EWS (Electronic Immobilizer)-Telegram error. This error code indicates a communication issue between the Electronic Immobilizer system and the Engine Control Module (ECM).

BMW DTC P1661 symptoms

Symptoms of a DTC P1661 error on a BMW may include:

• Engine not starting
• Engine stalling or running rough
• Immobilizer warning light illuminated on the dashboard

BMW DTC P1661 causes

The common causes of a DTC P1661 error on a BMW include:

• Faulty Electronic Immobilizer system
• Communication issues between the Immobilizer system and ECM
• Wiring or connection problems

BMW DTC P1661 seriousness

The DTC P1661 error on a BMW is considered serious as it can prevent the engine from starting or cause it to stall unexpectedly. It is important to address this issue promptly to ensure the vehicle’s proper operation and security.

How to diagnose DTC P1661 on BMW

To diagnose a DTC P1661 error on a BMW, you can perform the following steps:

1. Use a diagnostic scanner to retrieve the fault codes stored in the ECM.
2. Check the wiring and connections between the Electronic Immobilizer system and the ECM for any damage or loose connections.
3. Test the Electronic Immobilizer system components for proper functionality.

How to fix DTC P1661 on BMW

To fix a DTC P1661 error on a BMW, you can try the following solutions:

1. Repair or replace any damaged wiring or connections between the Immobilizer system and ECM.
2. Reset the Immobilizer system by disconnecting the battery for a few minutes and then reconnecting it.
3. If the issue persists, consider seeking assistance from a professional mechanic or BMW dealership for further diagnosis and repair.

How to erase DTC P1661 on BMW

To erase a DTC P1661 error code on a BMW, you can follow these steps:

1. Use a diagnostic scanner to clear the fault codes stored in the ECM.
2. After clearing the codes, start the engine and check for any recurrence of the error code.
3. If the error code does not reappear, the issue may have been resolved. If it reoccurs, further diagnosis may be necessary.

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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