BMW DTC P2740 – Transmission Fluid Temperature Sensor ‘B’ Circuit
DTC P2740 meaning on BMW
The Diagnostic Trouble Code (DTC) P2740 for BMW refers to an issue with the Transmission Fluid Temperature Sensor ‘B’ Circuit. This code indicates that there is a problem with the electrical circuit associated with the transmission fluid temperature sensor ‘B’ in the vehicle’s transmission system.
BMW DTC P2740 symptoms
Symptoms of DTC P2740 on a BMW may include:
- Check Engine Light illuminated on the dashboard
- Transmission shifting issues
- Transmission overheating
- Reduced fuel efficiency
BMW DTC P2740 causes
Common causes of DTC P2740 on a BMW include:
- Faulty transmission fluid temperature sensor ‘B’
- Wiring or connector issues in the sensor circuit
- Corroded or damaged sensor connections
- Internal transmission problems affecting sensor readings
BMW DTC P2740 seriousness
DTC P2740 should be addressed promptly as it can lead to potential transmission issues and affect the overall performance and reliability of the vehicle. Ignoring this code may result in further damage to the transmission system.
How to diagnose DTC P2740 on BMW
To diagnose DTC P2740 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and related data
- Inspect the transmission fluid temperature sensor ‘B’ and its wiring for any visible damage
- Test the sensor’s resistance and voltage readings to determine if it is functioning correctly
- Check for any loose or corroded connections in the sensor circuit
- Perform a thorough inspection of the transmission system for any other related issues
How to fix DTC P2740 on BMW
To fix DTC P2740 on a BMW, the following steps may be taken:
- Replace the faulty transmission fluid temperature sensor ‘B’ with a new, OEM part
- Repair or replace any damaged wiring or connectors in the sensor circuit
- Clean or replace corroded sensor connections
- Clear the fault code from the vehicle’s ECU memory
- Perform a test drive to ensure the issue has been resolved
How to erase DTC P2740 on BMW
To erase DTC P2740 on a BMW, the fault code can be cleared using a diagnostic scanner or by disconnecting the vehicle’s battery for a few minutes. However, it is important to address the underlying issue causing the fault code before clearing it to prevent it from reoccurring.
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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