BMW DTC C1104 – FlexRay_High / FlexRay_Low Circuit Shorted
DTC C1104 meaning on BMW
DTC C1104 on a BMW refers to a fault in the FlexRay communication system. Specifically, it indicates a circuit shorted condition on the FlexRay_High or FlexRay_Low lines. The FlexRay system is a high-speed communication network used in modern vehicles for transmitting data between various control modules.
BMW DTC C1104 symptoms
Symptoms of DTC C1104 on a BMW may include issues with the vehicle’s electronic systems. Common symptoms can include erratic behavior of electronic components, warning lights on the dashboard, and potential loss of communication between control modules.
BMW DTC C1104 causes
The causes of DTC C1104 on a BMW can vary, but the most common reasons include wiring harness issues, damaged connectors, or a short circuit in the FlexRay_High or FlexRay_Low lines. Environmental factors, such as moisture or corrosion, can also contribute to this fault.
BMW DTC C1104 seriousness
DTC C1104 should be taken seriously as it can affect the proper functioning of critical vehicle systems. Ignoring this fault can lead to potential safety hazards and may result in further damage to the vehicle’s electronic components.
How to diagnose DTC C1104 on BMW
To diagnose DTC C1104 on a BMW, a professional diagnostic scanner capable of reading manufacturer-specific fault codes is required. The technician will need to inspect the FlexRay communication system, check for continuity in the wiring harness, and test the FlexRay_High and FlexRay_Low circuits for shorts or open circuits.
Possible diagnostic steps:
- Use a diagnostic scanner to retrieve the fault code.
- Inspect the wiring harness for any visible damage or corrosion.
- Check the connectors for proper connection and signs of damage.
- Perform continuity tests on the FlexRay_High and FlexRay_Low circuits.
How to fix DTC C1104 on BMW
Fixing DTC C1104 on a BMW involves addressing the root cause of the circuit shorted condition. This may require repairing or replacing damaged wiring, connectors, or control modules related to the FlexRay system. Proper diagnosis is crucial to ensure an effective repair.
Possible repair steps:
- Repair or replace damaged wiring harness.
- Clean or replace corroded connectors.
- Address any short circuits in the FlexRay_High or FlexRay_Low lines.
- Reset the fault code after completing the repair.
How to erase DTC C1104 on BMW
To erase DTC C1104 on a BMW, a diagnostic scanner capable of clearing fault codes is needed. Once the underlying issue causing the fault code has been resolved, the technician can use the scanner to clear the code from the vehicle’s memory. This step is essential to ensure that the fault code does not reappear.
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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