BMW DTC P0848 – Transmission Fluid Pressure Sensor/Switch ‘B’ Circuit High
DTC P0848 meaning on BMW
DTC P0848 indicates a fault with the Transmission Fluid Pressure Sensor/Switch ‘B’ Circuit on a BMW vehicle. This code is triggered when the powertrain control module (PCM) detects that the signal voltage from the sensor/switch is higher than the expected range.
BMW DTC P0848 symptoms
Symptoms of DTC P0848 on a BMW may include harsh shifting, transmission slippage, transmission overheating, illuminated Check Engine Light (CEL), and in some cases, the transmission may go into a fail-safe or limp mode.
BMW DTC P0848 causes
The common causes of DTC P0848 on a BMW include a faulty Transmission Fluid Pressure Sensor/Switch ‘B’, damaged wiring or connectors in the sensor circuit, low transmission fluid level, dirty or contaminated transmission fluid, or a malfunctioning PCM.
BMW DTC P0848 seriousness
Ignoring DTC P0848 on a BMW can lead to further damage to the transmission system, potentially resulting in costly repairs. It is important to address this issue promptly to prevent any long-term damage to the vehicle.
How to diagnose DTC P0848 on BMW
To diagnose DTC P0848 on a BMW, a mechanic would typically start by using a diagnostic scanner to retrieve the fault codes from the PCM. They would then inspect the Transmission Fluid Pressure Sensor/Switch ‘B’ and its wiring for any visible damage or corrosion. Testing the sensor’s resistance and voltage output may also be necessary to pinpoint the issue accurately.
How to fix DTC P0848 on BMW
Fixing DTC P0848 on a BMW usually involves replacing the faulty Transmission Fluid Pressure Sensor/Switch ‘B’. Additionally, repairing any damaged wiring or connectors in the sensor circuit, ensuring the transmission fluid level is correct, and performing a transmission fluid flush and filter replacement if necessary can help resolve the issue.
How to erase DTC P0848 on BMW
Once the underlying issue causing DTC P0848 on a BMW has been fixed, the fault codes can be cleared using a diagnostic scanner. This will reset the Check Engine Light and erase the DTC from the PCM’s memory. It is important to verify that the repair was successful by driving the vehicle and rescanning for any remaining fault codes.
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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