P0742: Torque Converter Clutch Circuit Stuck On DTC Trouble Code

If you have a P0742 diagnostic trouble code, it means the solenoid that controls the torque convertor clutch is stuck in the ‘on’ position, which could impact drivability.

Need a replacement transmission? Get an estimate for replacement transmissions and local installation. Look up your transmission model by vehicle make and model.

What Transmission Do I Have?

How Serious is the Code?

The P0742 DTC means the torque convertor clutch is locked in direct-drive with the engine, so the vehicle will likely stall when you come to a stop, or let off the gas.

Symptoms

Symptoms of a P0742 include:

  • Check engine light
  • Erratic, delayed or harsh shifts
  • Engine stalls when coming to a stop
  • Transmission shudders/shakes when coming to a stop or accelerating
  • Transmission gets stuck in a gear
  • Vehicle won’t move when in gear
  • Lower MPG
  • Transmission overheats

Causes

  • Not enough transmission fluid
  • Dirty transmission fluid / filter
  • Damaged wiring/connector
  • Malfunctioning torque convertor clutch solenoid / TCC solenoid
  • Damaged torque convertor and/or clutch assembly
  • Blocked pressure passage
  • Valve body issue
  • TCM failure

How to Diagnose the Code?

To determine what is causing this DTC, a mechanic should first assess the condition of the transmission fluid, as dirty ATF can keep the TCC solenoid from working properly. The wiring and connectors should also be inspected for damage and corrosion. If no issues were found by this stage, then the torque convertor and TCC solenoid will have to be tested.

Common Mistakes When Diagnosing

It’s not uncommon to assume that the torque convertor itself needs to be replaced/rebuilt, when it could just be a faulty TCC solenoid or dirty/contaminated transmission fluid.

What Repairs Will Fix P0742?

  • Replace the torque converter clutch solenoid
  • Replace the torque converter or clutch
  • Change transmission fluid and filter
  • Repair/replace damaged wiring and connectors
  • Repair/replace TCM or ECU
  • Install a rebuilt or remanufactured transmission

Related Codes

P0740 – Torque Converter Clutch Circuit

P0741 – Torque Converter Clutch Circuit Performance or Stuck Off

P0743 – Torque Converter Clutch Circuit Electrical

P0744 – Torque Converter Clutch Circuit Intermittent

P2769 – Torque Converter Clutch Circuit Low

P2770 – Torque Converter Clutch Circuit High

Links To Diagnostic Codes

Links To Symptoms

Comments

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Need a replacement transmission? Get an estimate for replacement transmissions and local installation. Look up your transmission model by vehicle make and model.

What Transmission Do I Have?

Full Transmission DTC Codes Table

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