BMW DTC P0990 – Transmission Fluid Pressure Sensor/Switch ‘E’ Circuit High
DTC P0990 meaning on BMW
DTC P0990 on a BMW indicates a fault with the Transmission Fluid Pressure Sensor/Switch ‘E’ Circuit. This code is triggered when the powertrain control module (PCM) detects that the signal voltage from the transmission fluid pressure sensor/switch ‘E’ is higher than the expected range.
BMW DTC P0990 symptoms
Symptoms of DTC P0990 on a BMW may include harsh shifting, transmission slipping, transmission overheating, illuminated Check Engine Light (CEL), and in some cases, the transmission may go into limp mode.
BMW DTC P0990 causes
The common causes of DTC P0990 on a BMW include a faulty transmission fluid pressure sensor/switch ‘E’, damaged wiring or connectors in the sensor circuit, low transmission fluid level, or a malfunctioning PCM.
BMW DTC P0990 seriousness
DTC P0990 should be addressed promptly as it can lead to further damage to the transmission if left unresolved. Ignoring this fault may result in transmission failure and potentially costly repairs.
How to diagnose DTC P0990 on BMW
To diagnose DTC P0990 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 ‘E’ and its wiring for any visible damage. Testing the sensor’s resistance and voltage output may also be necessary to pinpoint the issue accurately.
How to fix DTC P0990 on BMW
Fixing DTC P0990 on a BMW usually involves replacing the faulty transmission fluid pressure sensor/switch ‘E’. Additionally, repairing any damaged wiring or connectors in the sensor circuit and ensuring the transmission fluid level is correct can help resolve the issue. If the problem persists, further diagnostics may be required to identify any underlying issues.
How to erase DTC P0990 on BMW
Once the underlying issue causing DTC P0990 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 P0990 code from the PCM’s memory. It is essential to ensure that the repair has been successful before clearing the 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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