BMW DTC P0844 – Transmission Fluid Pressure Sensor/Switch ‘A’ Circuit Intermittent
DTC P0844 meaning on BMW
DTC P0844 on a BMW indicates an intermittent issue with the Transmission Fluid Pressure Sensor/Switch ‘A’ Circuit. This fault code is triggered when the powertrain control module (PCM) detects a variation in the signal from the transmission fluid pressure sensor or switch, which is responsible for monitoring the hydraulic pressure within the transmission.
BMW DTC P0844 symptoms
Symptoms of DTC P0844 on a BMW may include erratic shifting behavior, harsh shifting, transmission slipping, transmission overheating, and in some cases, the transmission may go into a fail-safe or limp mode to prevent further damage.
BMW DTC P0844 causes
The common causes of DTC P0844 on a BMW include a faulty transmission fluid pressure sensor/switch, damaged wiring or connectors in the sensor circuit, low transmission fluid level, dirty or contaminated transmission fluid, or a malfunctioning PCM.
BMW DTC P0844 seriousness
Ignoring DTC P0844 on a BMW can lead to further transmission damage and potentially result in costly repairs. It is important to address this issue promptly to prevent any long-term damage to the transmission system.
How to diagnose DTC P0844 on BMW
To diagnose DTC P0844 on a BMW, a mechanic would typically start by using a diagnostic scan tool to retrieve the fault codes stored in the PCM. They would then inspect the transmission fluid pressure sensor/switch, check the wiring and connectors for any damage, and perform a transmission fluid level and condition check.
How to fix DTC P0844 on BMW
Fixing DTC P0844 on a BMW may involve replacing the transmission fluid pressure sensor/switch, repairing any damaged wiring or connectors, ensuring the transmission fluid level is correct and clean, and resetting the fault codes stored in the PCM.
How to erase DTC P0844 on BMW
To erase DTC P0844 on a BMW, a mechanic would use a diagnostic scan tool to clear the fault codes stored in the PCM. Once the issue has been addressed and fixed, the mechanic can then reset the fault codes to ensure the warning light does not reappear.
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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