BMW DTC P1604 – Control Module Self-Test, Speed Monitoring
DTC P1604 meaning on BMW
The DTC P1604 on a BMW refers to the Control Module Self-Test, Speed Monitoring. This diagnostic trouble code indicates that there is an issue with the control module’s self-test related to speed monitoring functions.
BMW DTC P1604 symptoms
Symptoms of DTC P1604 on a BMW may include:
- Check Engine Light illuminated
- Speedometer not functioning correctly
- Loss of power or performance
BMW DTC P1604 causes
Common causes of DTC P1604 on a BMW include:
- Faulty control module
- Wiring or connection issues
- Speed sensor malfunction
BMW DTC P1604 seriousness
The seriousness of DTC P1604 on a BMW can vary. While it may not always result in immediate drivability issues, it is important to address the underlying problem to prevent potential safety hazards or further damage to the vehicle.
How to diagnose DTC P1604 on BMW
To diagnose DTC P1604 on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault code
- Inspect the control module and related wiring for any visible damage
- Test the speed sensor for proper operation
How to fix DTC P1604 on BMW
To fix DTC P1604 on a BMW, the following steps may be taken:
- Replace the faulty control module if necessary
- Repair any damaged wiring or connections
- Replace the speed sensor if it is found to be malfunctioning
How to erase DTC P1604 on BMW
To erase DTC P1604 on a BMW, the fault code can be cleared using a diagnostic scanner. After addressing the underlying issue and making the necessary repairs, the code can be reset to turn off the Check Engine Light.
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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