BMW DTC P2742 – Transmission Fluid Temperature Sensor ‘B’ Circuit Low
DTC P2742 meaning on BMW
The Diagnostic Trouble Code (DTC) P2742 for BMW refers to the Transmission Fluid Temperature Sensor ‘B’ Circuit Low. This code indicates that the signal from the transmission fluid temperature sensor ‘B’ is below the expected range, potentially causing issues with the transmission system.
BMW DTC P2742 symptoms
Symptoms of DTC P2742 on a BMW may include:
- Check Engine Light illuminated
- Transmission shifting issues
- Reduced fuel efficiency
- Transmission overheating
BMW DTC P2742 causes
Common causes of DTC P2742 on a BMW include:
- Faulty transmission fluid temperature sensor ‘B’
- Wiring or connector issues in the sensor circuit
- Low transmission fluid level
- Internal transmission problems
BMW DTC P2742 seriousness
Ignoring DTC P2742 on a BMW can lead to potential transmission damage and drivability issues. It is important to address this code promptly to prevent further damage to the transmission system.
How to diagnose DTC P2742 on BMW
To diagnose DTC P2742 on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault code
- Inspect the transmission fluid temperature sensor ‘B’ and its wiring for any visible damage
- Check the transmission fluid level and condition
- Perform a resistance test on the sensor to determine if it is within specifications
How to fix DTC P2742 on BMW
To fix DTC P2742 on a BMW, the following steps may be taken:
- Replace the faulty transmission fluid temperature sensor ‘B’
- Repair any damaged wiring or connectors in the sensor circuit
- Ensure the transmission fluid level is at the correct level and in good condition
- If internal transmission issues are found, further diagnosis and repair may be necessary
How to erase DTC P2742 on BMW
After fixing the underlying issue causing DTC P2742 on a BMW, the fault code can be erased using a diagnostic scanner. This will clear the code from the vehicle’s memory and turn off the Check Engine Light. It is important to verify that the issue has been resolved before clearing the code.
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
Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.