AutoCodes - OBDII Code List - P0743 SUBARU

P0743 SUBARU - Torque Converter Clutch Circuit Electrical

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3
Table of contents

P0743 SUBARU Possible Causes

  • Faulty torque converter clutch solenoid valve
  • Torque converter clutch solenoid valve harness is open or shorted
  • Torque converter clutch solenoid valve circuit poor electrical connection
  • Low transmission fluid level
  • Dirty transmission fluid

How do I fix code P0743 SUBARU?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
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Tech Notes

This is an electrical problem code. Could be a problem to the harness to the Torque Converter Clutch (TCC) solenoid, the TCC solenoid connector or the TCC solenoid it self.

Cost of diagnosing the P0743 SUBARU code

Labor: 1.0

The cost of diagnosing the P0743 SUBARU code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

When is the code detected?

By performing a voltage drop test, the Engine Control Module (ECM) detects that the Torque Converter Clutch (TCC) solenoid circuit is open or shorted.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P0743 SUBARU Description

The Torque Converter Clutch (TCC) solenoid valve is activated, with the gear in D4, by the Transmission Control Module (TCM) in response to signals sent from the vehicle speed and the Engine Control Module (ECM). Lock-up piston operation will then be controlled. When the torque converter clutch solenoid valve is activated, the torque converter lockup clutch will engage creating a 1 to 1 RPM ratio between the transmission input shaft and the rotational speed of the torque converter.
Lock-up operation, however, is prohibited when A/T fluid temperature is too low.
When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.
OBDII Code P0743 Subaru - Torque Converter Clutch Circuit Electrical - AutoCodes.com

More Information

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Comments

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