Is It Safe to Drive With a P0742 Code?
Common Symptoms of a P0742 Fault
Engine stalling when coming to a stop
Rough low-speed driving
EML and transmission warning light
Shuddering when pulling away
Possible Causes of P0742
A P0742 code can be triggered by faults across several systems. Identifying the exact root cause requires proper diagnostic equipment and live data — not just reading the code.
TCC Solenoid Stuck On
The TCC solenoid is stuck in the engaged position.
Valve Body Fault
The hydraulic valve body is holding the TCC circuit engaged.
Transmission Fluid Issue
Debris or varnish in the fluid causing the TCC circuit to stick.
TCU Control Circuit Short
Short circuit in the TCU output keeping TCC permanently engaged.
Why we don't list the exact part: A P0742 code tells you what's happening but not why. Replacing parts based on the code alone is the most common way drivers waste money. A proper diagnosis identifies the specific cause first.
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P0742 and Your MOT
A stored P0742 fault code will cause your car to fail its MOT. The engine management light will be illuminated during the test — an automatic failure under current MOT standards. Even if the light temporarily clears, the code remains in ECU memory and can be read by testers.
Get the fault diagnosed and repaired first, then have the code cleared and confirm the light stays off before booking your MOT.