P0743

Torque Converter Clutch Circuit Electrical

Q: Is it safe to drive with P0743?

Short trips are usually fine, but persistent TCC slipping raises transmission temperature — avoid long highway drives until it is fixed.

Q: Can I just clear P0743?

You can, but it returns until the solenoid or wiring fault in the TCC circuit is repaired.

Transmission — torque converter Generic OBD-II Medium

What it means

P0743 means the transmission control module found an electrical fault in the circuit that operates the torque converter clutch (TCC). With the TCC not locking up properly, you may feel shudder or slipping at cruising speed and see higher engine RPM on the highway. The engine still starts and runs, but the transmission can run hotter until it is repaired.

Medium

Can I keep driving? Usually fine for short trips — the car still drives, but you may feel slipping or shudder and higher highway RPM, and the transmission can run hotter, so have it checked before long drives.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Torque converter shudder or slipping, especially at cruising speed
Higher-than-normal engine RPM on the highway
Harsh or delayed shifting
Slightly reduced fuel economy

Common causes

Most likely first

Failed torque converter clutch (TCC) solenoidLikely
Damaged, shorted, or corroded wiring or connector in the TCC circuitCommon
Poor ground or loose connector at the transmissionCommon
Internal transmission fault affecting the TCCLess often
Failed transmission control module (TCM) — least commonLess often

How to diagnose & fix

Work through it in order

Read freeze-frame data and confirm the code with a scan tool.
Inspect the TCC solenoid wiring and connector at the transmission for damage or corrosion.
Measure the solenoid resistance against spec and test its control circuit for opens/shorts.
Replace the TCC solenoid if it is out of spec.
If wiring and solenoid check out, have the transmission/TCM diagnosed. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P0743?+

Short trips are usually fine, but persistent TCC slipping raises transmission temperature — avoid long highway drives until it is fixed.

Can I just clear P0743?+

You can, but it returns until the solenoid or wiring fault in the TCC circuit is repaired.

Read & clear P0743 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX