BMW DTC P1900 – Transmission Fluid Cooler No Flow Detected
DTC P1900 meaning on BMW
The Diagnostic Trouble Code (DTC) P1900 for BMW indicates that the Transmission Fluid Cooler Flow is not detected. This means that the vehicle’s onboard computer system has detected an issue with the transmission fluid cooler system, specifically the lack of flow through the cooler.
BMW DTC P1900 symptoms
Symptoms of DTC P1900 on a BMW may include:
- Transmission overheating
- Transmission slipping or shifting issues
- Check Engine Light illuminated on the dashboard
- Reduced fuel efficiency
BMW DTC P1900 causes
Common causes of DTC P1900 on a BMW include:
- Blocked transmission fluid cooler lines
- Malfunctioning transmission fluid pump
- Low transmission fluid level
- Defective transmission fluid cooler
BMW DTC P1900 seriousness
Ignoring DTC P1900 on a BMW can lead to serious transmission issues, including potential damage to the transmission components due to overheating. It is important to address this code promptly to prevent further damage and ensure the vehicle’s drivability.
How to diagnose DTC P1900 on BMW
To diagnose DTC P1900 on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the transmission fluid cooler lines for blockages
- Check the transmission fluid level and condition
- Test the transmission fluid pump for proper operation
How to fix DTC P1900 on BMW
To fix DTC P1900 on a BMW, the following steps may be taken:
- Clean or replace blocked transmission fluid cooler lines
- Ensure the transmission fluid level is correct and top up if necessary
- Replace a malfunctioning transmission fluid pump
- Repair or replace a defective transmission fluid cooler
How to erase DTC P1900 on BMW
To erase DTC P1900 on a BMW, the fault codes can be cleared using a diagnostic scanner. After addressing the underlying issue causing the code, the codes can be cleared to reset the Check Engine Light and ensure that the repair was successful.
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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