BMW DTC P0842 – Transmission Fluid Pressure Sensor/Switch ‘A’ Circuit Low
DTC P0842 meaning on BMW
DTC P0842 on a BMW indicates a low circuit condition in the transmission fluid pressure sensor/switch ‘A’. This fault code is triggered when the powertrain control module (PCM) detects that the signal from the transmission fluid pressure sensor/switch ‘A’ is lower than the expected range.
BMW DTC P0842 symptoms
Symptoms of DTC P0842 on a BMW may include harsh shifting, transmission slipping, delayed engagement, decreased fuel efficiency, and in some cases, the transmission may go into limp mode. The Check Engine Light may also illuminate on the dashboard.
BMW DTC P0842 causes
The common causes of DTC P0842 on a BMW include a faulty transmission fluid pressure sensor/switch ‘A’, damaged wiring or connectors in the sensor circuit, low transmission fluid level, or a malfunctioning PCM.
BMW DTC P0842 seriousness
Ignoring DTC P0842 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 P0842 on BMW
To diagnose DTC P0842 on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault codes from the PCM. They would then inspect the transmission fluid pressure sensor/switch ‘A’ and its wiring for any visible damage or corrosion. Testing the sensor’s resistance and checking the transmission fluid level may also be necessary.
How to fix DTC P0842 on BMW
Fixing DTC P0842 on a BMW may involve replacing the transmission fluid pressure sensor/switch ‘A’ if it is found to be faulty. Repairing or replacing any damaged wiring or connectors in the sensor circuit is also essential. Additionally, ensuring the transmission fluid level is at the correct level and the PCM is functioning properly can help resolve this issue.
How to erase DTC P0842 on BMW
After fixing the underlying issue causing DTC P0842 on a BMW, the fault code can be erased using a diagnostic scanner. By clearing the code, the Check Engine Light should turn off. 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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