BMW DTC P1859 – Clutch Speed Sensor Plausibility
DTC P1859 meaning on BMW
The DTC P1859 on a BMW refers to a Clutch Speed Sensor Plausibility fault. This fault code indicates that the clutch speed sensor’s signal is not within the expected range or is not plausible based on other sensor inputs.
BMW DTC P1859 symptoms
Symptoms of a DTC P1859 on a BMW may include:
- Check Engine Light illuminated
- Transmission shifting issues
- Reduced vehicle performance
BMW DTC P1859 causes
Common causes of a DTC P1859 on a BMW include:
- Defective clutch speed sensor
- Wiring or connection issues in the clutch speed sensor circuit
- Faulty transmission control module
BMW DTC P1859 seriousness
The seriousness of a DTC P1859 on a BMW depends on the underlying cause. Ignoring this fault code can lead to further transmission issues and potential drivability problems. It is recommended to address this fault promptly to prevent any long-term damage.
How to diagnose DTC P1859 on BMW
To diagnose a DTC P1859 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and related data
- Inspect the clutch speed sensor and its wiring for any visible damage or corrosion
- Test the clutch speed sensor’s signal using a multimeter
- Check for any stored freeze frame data to understand the conditions when the fault occurred
How to fix DTC P1859 on BMW
To fix a DTC P1859 on a BMW, the following steps may be taken:
- Replace the faulty clutch speed sensor if it is found to be defective
- Repair any damaged wiring or connections in the clutch speed sensor circuit
- If necessary, replace the transmission control module
- Clear the fault code and perform a test drive to ensure the issue is resolved
How to erase DTC P1859 on BMW
To erase a DTC P1859 on a BMW, the fault code can be cleared using a diagnostic scanner. After the repair has been completed, the mechanic can access the vehicle’s onboard computer system and clear the fault code to reset 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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