Is It Safe to Drive With a P0740 Code?
Common Symptoms of a P0740 Fault
P0740 Symptoms at a Glance
EML on
Reduced fuel economy
Shudder or flare when the transmission locks up
Harsh or delayed engagement
Possible Causes of P0740
A P0740 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.
Common Causes of P0740
TCC Solenoid Wiring Fault
Damaged or corroded wiring to the solenoid.
Low or Dirty Transmission Fluid
Contaminated fluid affecting solenoid operation.
Faulty TCC Solenoid
The solenoid itself has failed.
TCM Fault
The transmission control module's driver circuit has failed.
Why we don't list the exact part: A P0740 code tells you what's happening but not why. Replacing parts without diagnosis is the most common way drivers waste money. A proper diagnosis identifies the specific cause first.
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P0740 and Your MOT
A stored P0740 fault code will cause your car to fail its MOT due to the illuminated engine management light. Get the fault diagnosed and repaired, then have the code cleared before booking your test.