BMW DTC P0742 – Torque Converter Clutch Circuit Stuck On
DTC P0742 meaning on BMW
The Diagnostic Trouble Code (DTC) P0742 for BMW indicates that the torque converter clutch circuit is stuck on. This means that the torque converter clutch, which is responsible for connecting the engine to the transmission, is not disengaging properly. The torque converter clutch is designed to improve fuel efficiency and reduce heat buildup in the transmission by locking up at higher speeds.
BMW DTC P0742 symptoms
Some common symptoms of DTC P0742 on a BMW may include:
- Engine stalling at idle
- Decreased fuel efficiency
- Transmission overheating
- Harsh or delayed shifting
- Check Engine Light illuminated
BMW DTC P0742 causes
The most common causes of DTC P0742 on a BMW include:
- Failed torque converter clutch solenoid
- Wiring issues in the torque converter clutch circuit
- Low transmission fluid level or dirty fluid
- Internal transmission problems
BMW DTC P0742 seriousness
Ignoring DTC P0742 on a BMW can lead to further damage to the transmission and potentially result in costly repairs. Driving with a malfunctioning torque converter clutch can also decrease fuel efficiency and overall vehicle performance.
How to diagnose DTC P0742 on BMW
To diagnose DTC P0742 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the torque converter clutch solenoid and 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 P0742 on BMW
Depending on the underlying cause, fixing DTC P0742 on a BMW may involve:
- Replacing the torque converter clutch solenoid
- Repairing or replacing damaged wiring in the circuit
- Performing a transmission fluid flush and filter replacement
- Repairing internal transmission components if necessary
How to erase DTC P0742 on BMW
After fixing the issue causing DTC P0742 on a BMW, the fault codes can be erased using a diagnostic scanner. This will reset the Check Engine Light and allow the vehicle’s onboard computer to monitor the system for any new faults.
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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