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P0740 BMW Code - Torque Converter Clutch Circuit Open

- Code Popularity: 32,276 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
By AutoCodes.com - Updated May 08, 2019
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|Code P0740 BMW Possible Causes

  • Low transmission fluid level
  • Dirty transmission fluid
  • Faulty torque converter clutch solenoid valve
  • Torque converter clutch solenoid valve harness is open or shorted
  • Torque converter clutch solenoid valve circuit poor electrical connection

|How do I Fix the Code P0740 BMW?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Does your BMW have Safety Recalls? → Check here

|What is the Cost to Diagnose the Code P0740 BMW?

Labor: 1.0

The cost of diagnosing the P0740 BMW code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

|When is the Code P0740 BMW Detected?

Diagnostic trouble code P0740 is detected when TCM detects an improper voltage drop when it tries to operate the solenoid valve.

|What are Code P0740 BMW Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Transmission shift shock
  • Vehicle may not shift into the highest gear

|Code P0740 BMW Description

The torque converter clutch solenoid valve is activated, with the gear in D4, by the Transmission Control Module (TCM) in response to signals sent from the vehicle speed and the Engine Control Module (ECM). Lock-up piston operation will then be controlled. When the torque converter clutch solenoid valve is activated, the torque converter lockup clutch will engage creating a 1 to 1 RPM ratio between the transmission input shaft and the rotational speed of the torque converter.
Lock-up operation, however, is prohibited when A/T fluid temperature is too low.
When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.

OBDII Code P0740 BMW - Torque Converter Clutch Circuit Open - AutoCodes.com
P0740 BMW Code - Torque Converter Clutch Circuit Open

|Need More Information on the P0740 BMW Code?

Need more information on how to fix the P0740 BMW code? Get Access to Factory Service Manuals

|Need Help with the P0740 BMW Code?

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|Code P0740 BMW comments

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