BMW DTC P0740 – Torque Converter Clutch Circuit/Open
DTC P0740 meaning on BMW
The Diagnostic Trouble Code (DTC) P0740 for BMW indicates a problem with the Torque Converter Clutch Circuit/Open. This means that the powertrain control module (PCM) has detected an issue with the torque converter clutch solenoid circuit, which is responsible for engaging and disengaging the torque converter lock-up function.
BMW DTC P0740 symptoms
Symptoms of a DTC P0740 on a BMW may include:
- Engine stalling at idle
- Slipping or shuddering during acceleration
- Decreased fuel efficiency
- Check Engine Light illuminated on the dashboard
BMW DTC P0740 causes
The common causes of a DTC P0740 on a BMW include:
- Faulty torque converter clutch solenoid
- Wiring or connector issues in the torque converter clutch circuit
- Low transmission fluid level or dirty fluid
- Internal transmission problems
BMW DTC P0740 seriousness
Ignoring a DTC P0740 on a BMW can lead to further damage to the transmission and potentially result in costly repairs. It is important to address this issue promptly to prevent drivability problems and ensure the longevity of the vehicle.
How to diagnose DTC P0740 on BMW
To diagnose a DTC P0740 on a BMW, a mechanic would typically perform the following steps:
- Use a scan tool to retrieve the DTC and freeze frame data
- Inspect the torque converter clutch solenoid and its wiring for any visible damage
- Check the transmission fluid level and condition
- Perform a road test to observe the symptoms and confirm the issue
How to fix DTC P0740 on BMW
Depending on the root cause of the DTC P0740, fixing the issue on a BMW may involve:
- Replacing the torque converter clutch solenoid
- Repairing or replacing damaged wiring or connectors
- Performing a transmission fluid flush and filter replacement
- Addressing any internal transmission problems
How to erase DTC P0740 on BMW
After fixing the underlying issue causing the DTC P0740 on a BMW, the code can be erased using a scan tool. This will clear the code from the PCM’s memory and turn off the Check Engine Light. It is important to ensure that the repair has been successful 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
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