Error code

OBD2 P0743

OBD2P0743
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Torque Converter Clutch Circuit Electrical.

Severity

moderateCan drive but may experience harsh gear shifts and slippage. Address the issue as soon as possible.

Summary

P0743 indicates an electrical issue with the Torque Converter Clutch (TCC) solenoid circuit in the transmission.

Symptoms

  • Illuminated warning light
  • Harsh gear shifts
  • Severe transmission slippage during hard acceleration
  • Engine stalling when coming to a stop
  • Transmission overheating
  • Increased fuel consumption

Common Causes

  • Damaged, burnt, shorted, disconnected, or corroded wiring and/or connectors
  • Defective TCC solenoid
  • Dirty, contaminated, or degraded transmission fluid
  • Failed or failing PCM/TCM (rare)

Diagnosis

  1. Inspect transmission fluid condition
  2. Check wiring harness and connectors for damage or corrosion
  3. Perform resistance, continuity, and ground checks on associated wiring
  4. Command TCC solenoid 'ON' and 'OFF' using a scanner to monitor status

Fixes

  • Replace damaged wiring/connectors or defective TCC solenoid

FAQ

Can I drive with P0743?

You can drive but may experience harsh gear shifts and slippage. It's best to address the issue as soon as possible.

What causes P0743?

Common causes include damaged wiring/connectors, a defective TCC solenoid, or dirty transmission fluid.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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