Engine-Codes - Hummer - P0740 Hummer

P0740 Hummer Code - Torque Converter Clutch Malfunction

- Code Popularity: 550 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the Code P0740 Hummer?

  • 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 to Fix the P0740 Hummer Code?

Start by checking 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.

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

Labor: 1.0

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

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|When is the P0740 Hummer Code Detected?

When the PCM detects a continuous open, short to ground or short to power in the TCC solenoid valve circuit, then DTC P0740 sets.

|What are Code P0740 Hummer Possible Symptoms?

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

|What Does the P0740 Hummer Code Mean?

The Torque Converter Clutch (TCC) solenoid valve is an electrical device that is used with the torque converter clutch pulse width modulation (TCC PWM) solenoid valve in order to control TCC apply and release. The TCC solenoid valve attaches to the transmission case assembly extending into the pump cover. The Powertrain Control Module (PCM) controls the solenoid by providing the ground path. The PCM monitors the throttle position (TP) voltage, the vehicle speed and other inputs in order to determine when to energize the TCC solenoid valve.

Torque Converter Clutch Malfunction

|Need more Information on the P0740 Hummer Code?

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

|Need Help with the P0740 Hummer Code?

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