BMW DTC P1812 – Output Shaft Speed Sensor Circuit High
DTC P1812 meaning on BMW
DTC P1812 on a BMW indicates a fault with the Output Shaft Speed Sensor Circuit being detected as high. The Output Shaft Speed Sensor is responsible for monitoring the speed of the output shaft of the transmission. When the circuit is reading a high signal, it means that the sensor is reporting a speed that is higher than expected.
BMW DTC P1812 symptoms
Symptoms of DTC P1812 on a BMW may include erratic shifting behavior, transmission slipping, harsh shifting, or the transmission going into limp mode. The vehicle’s transmission may also fail to engage properly or exhibit poor performance.
BMW DTC P1812 causes
The causes of DTC P1812 on a BMW can vary, but common reasons include a faulty Output Shaft Speed Sensor, damaged wiring or connectors in the sensor circuit, or issues with the transmission control module.
BMW DTC P1812 seriousness
DTC P1812 should be taken seriously as it can lead to drivability issues and potential damage to the transmission if left unresolved. It is recommended to address this fault promptly to prevent further complications.
How to diagnose DTC P1812 on BMW
To diagnose DTC P1812 on a BMW, a mechanic would typically start by using a diagnostic scanner to retrieve the fault code and perform a visual inspection of the Output Shaft Speed Sensor and its wiring. They may also conduct tests to check the sensor’s resistance and signal output to determine if it is functioning correctly.
How to fix DTC P1812 on BMW
Fixing DTC P1812 on a BMW may involve replacing the faulty Output Shaft Speed Sensor, repairing any damaged wiring or connectors in the circuit, or addressing issues with the transmission control module. It is essential to follow the manufacturer’s diagnostic and repair procedures to ensure a proper fix.
How to erase DTC P1812 on BMW
To erase DTC P1812 on a BMW, the fault code can be cleared using a diagnostic scanner. However, it is crucial to address the underlying issue causing the fault code before clearing it to prevent it from reoccurring. Once the repair has been made, the fault code can be cleared, and the vehicle’s system should be rechecked to ensure the fault is resolved.
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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