BMW DTC P0845 – Transmission Fluid Pressure Sensor/Switch ‘B’ Circuit
DTC P0845 meaning on BMW
DTC P0845 on a BMW indicates a fault with the Transmission Fluid Pressure Sensor/Switch ‘B’ Circuit. This code is triggered when the powertrain control module (PCM) detects an abnormal signal from the sensor or switch related to the transmission fluid pressure in the transmission.
BMW DTC P0845 symptoms
Symptoms of DTC P0845 on a BMW may include harsh shifting, transmission slipping, delayed engagement when shifting gears, and in some cases, the transmission may go into a limp mode to prevent further damage.
BMW DTC P0845 causes
The common causes of DTC P0845 on a BMW include a faulty transmission fluid pressure sensor/switch, wiring issues in the sensor circuit, low transmission fluid level, dirty or contaminated transmission fluid, or a malfunctioning PCM.
BMW DTC P0845 seriousness
DTC P0845 should not be ignored as it can lead to further transmission damage if left unresolved. It is recommended to address this issue promptly to prevent potential costly repairs in the future.
How to diagnose DTC P0845 on BMW
To diagnose DTC P0845 on a BMW, a mechanic would typically start by using a diagnostic scanner to retrieve the fault code and then perform a visual inspection of the transmission fluid pressure sensor/switch and its wiring. They may also conduct tests to check the sensor’s resistance and voltage readings to determine if it is functioning correctly.
How to fix DTC P0845 on BMW
Fixing DTC P0845 on a BMW may involve replacing the transmission fluid pressure sensor/switch if it is found to be faulty. Additionally, checking and correcting any wiring issues, ensuring the transmission fluid level is correct, and performing a transmission fluid flush and filter replacement may also be necessary to resolve the issue.
How to erase DTC P0845 on BMW
Once the underlying issue causing DTC P0845 on a BMW has been fixed, the fault code can be cleared using a diagnostic scanner. This will reset the PCM and turn off the check engine light. It is important to verify that the issue has been resolved before clearing the code to prevent it from reoccurring.
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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