CityFix

P0740 on Honda City GM2: Torque Converter Clutch Circuit Malfunction

Short answer: P0740 means “Torque Converter Clutch Circuit Malfunction”. The car’s computer has found a fault in the AT (gearbox) system and turns on the Check engine light (MIL). First check: read the code with a scanner that can read the gearbox computer.

Standard OBD-II code Same meaning on all cars (SAE J2012). Not checked against this car’s factory manual.

Code
P0740
System
AT (gearbox)
Dashboard light
Check engine light (MIL)
Applies to
Generic OBD-II meaning. Not every code is used by this car.
Confidence
medium (generic OBD-II definition, not checked against the factory manual for this car)
Source
obd-codes.com

Symptoms and when it is set

  1. Check engine light on
  2. Minimal decrease in fuel economy, this will not affect engine performance

Likely causes

  1. Wiring harness to transmission damaged, loose connection, open or shorted circuit
  2. Torque converter clutch (TCC) solenoid
  3. Transmission control module (TCM)
  4. Diagnostic Steps for P0740 DTC
  5. Wiring harness 6.- Check transmission wiring harness for damage or loose connections. Use a factory wiring diagram to locate the appropriate power source and all…
  6. Using a digital volt ohm meter (DVOM), set to ohms scale, check for resistance in the circuit with the positive and negative leads on the…

What to check, in order

  1. Read the code with a scanner that can read the gearbox computer
  2. Check the gearbox fluid level and condition with the correct procedure
  3. Check the connector and wiring at the gearbox
  4. Have a gearbox specialist confirm before replacing parts

Related on this car

Same code on other cars

← P0720 P0741 →

Clearing the code does not fix the fault. If it comes back, the problem is still there. For brakes, airbags and steering, see a trained mechanic.