P0742

P0742 indicates the torque converter clutch is stuck in the engaged (on) position. This is a more serious condition than the clutch being stuck off (P0741) because a converter that stays locked at low speeds acts like driving a manual transmission without pressing the clutch — the engine will stall or buck severely when you slow down or come to a stop.

This code creates a noticeable and potentially dangerous driving condition. The vehicle may stall at stop signs or traffic lights, buck and surge in stop-and-go traffic, and feel extremely rough at low speeds. If you experience stalling when stopping, this code needs immediate attention as it affects your ability to safely drive in traffic.

The most common cause is a TCC solenoid that is stuck in the on position, either mechanically or due to a wiring short. Have this diagnosed promptly — driving with a locked torque converter puts extreme stress on the transmission and engine, and stalling in traffic is a safety hazard. A solenoid replacement or wiring repair may resolve the issue, but if the torque converter itself is mechanically stuck, converter replacement will be necessary.

Severity

Symptoms

• •Engine stalls when slowing down or coming to a stop
• •Vehicle bucks or surges at low speeds
• •Rough idle or engine struggles to stay running
• •Check Engine light illuminated
• •Vehicle feels like it's being driven in too high a gear at low speeds

Likely Causes

Estimated Cost

Common Fixes

1. Replace the TCC solenoid
2. Repair or replace shorted wiring in the TCC circuit
3. Repair or replace the valve body
4. Replace the torque converter
5. Reprogram or replace the TCM/PCM

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