BMW DTC P1721 – CAN Timeout ASC/DSC
DTC P1721 meaning on BMW
The Diagnostic Trouble Code (DTC) P1721 for BMW refers to a CAN Timeout ASC/DSC error. This code indicates a communication issue within the Anti-lock Braking System (ABS) and Dynamic Stability Control (DSC) modules, which are crucial components for vehicle stability and traction control.
BMW DTC P1721 symptoms
Symptoms of the BMW DTC P1721 may include:
- ABS and DSC warning lights illuminated on the dashboard
- Loss of traction control functionality
- Decreased stability while driving
BMW DTC P1721 causes
Common causes of the BMW DTC P1721 include:
- Faulty ABS/DSC control modules
- Intermittent wiring or connection issues
- Defective wheel speed sensors
- Communication bus faults
BMW DTC P1721 seriousness
The DTC P1721 for BMW should be addressed promptly as it can affect the vehicle’s stability and safety systems. Ignoring this code may lead to compromised traction control and stability control, increasing the risk of accidents, especially in adverse driving conditions.
How to diagnose DTC P1721 on BMW
To diagnose the DTC P1721 on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault codes stored in the ABS/DSC modules.
- Inspect the wiring harness and connectors for any visible damage or corrosion.
- Check the wheel speed sensors for proper operation and signal output.
- Perform a CAN bus communication test to identify any network issues.
How to fix DTC P1721 on BMW
To fix the DTC P1721 on a BMW, you can try the following solutions:
- Replace the faulty ABS/DSC control modules if necessary.
- Repair any damaged wiring or connectors in the ABS/DSC system.
- Replace defective wheel speed sensors that are causing the communication timeout.
- Reset the ABS/DSC modules and clear the fault codes after making repairs.
How to erase DTC P1721 on BMW
To erase the DTC P1721 on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the ABS/DSC modules. After performing the necessary repairs and ensuring that the issue has been resolved, you can reset the system and verify that the error code has been successfully erased.
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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