BMW DTC P1774 – CAN Wheel Speed Rear Wheel Left No Signal
DTC P1774 meaning on BMW
The DTC P1774 code on a BMW indicates that there is no signal coming from the rear left wheel speed sensor over the Controller Area Network (CAN) bus. This means that the vehicle’s onboard computer is not receiving the necessary data regarding the speed of the rear left wheel.
BMW DTC P1774 symptoms
Symptoms of the DTC P1774 code on a BMW may include:
- ABS warning light illuminated on the dashboard
- Traction control system malfunction
- Stability control system not functioning properly
- Loss of traction control during driving
BMW DTC P1774 causes
The DTC P1774 code on a BMW can be caused by various factors, including:
- Defective rear left wheel speed sensor
- Wiring or connection issues in the CAN bus system
- Faulty ABS control module
- Corrosion or damage to sensor connectors
BMW DTC P1774 seriousness
The DTC P1774 code should not be ignored, as it can affect the proper functioning of the vehicle’s safety systems, such as ABS and traction control. Driving with this code present may compromise the vehicle’s stability and handling in certain driving conditions.
How to diagnose DTC P1774 on BMW
To diagnose the DTC P1774 code on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s computer.
- Inspect the rear left wheel speed sensor and its wiring for any visible damage or corrosion.
- Check the connections and wiring in the CAN bus system for any loose or damaged components.
- Perform a visual inspection of the ABS control module and related components.
How to fix DTC P1774 on BMW
To fix the DTC P1774 code on a BMW, you can try the following solutions:
- Replace the rear left wheel speed sensor if it is found to be faulty.
- Repair or replace any damaged wiring or connectors in the CAN bus system.
- If the ABS control module is faulty, it may need to be replaced or reprogrammed.
- Clear the fault codes using a diagnostic scanner after completing the repairs.
How to erase DTC P1774 on BMW
To erase the DTC P1774 code on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the vehicle’s computer. After completing the necessary repairs and ensuring that the issue has been resolved, you can reset the system by erasing the fault code.
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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