P0744

Torque Converter Clutch Circuit Intermittent

Q: Is it safe to drive with P0744?

Short-term yes. The converter clutch just isn't locking reliably, so you'll see higher cruising rpm and slightly worse mileage. Fix it before it becomes a constant fault or causes converter wear.

Q: Can I just clear P0744?

You can, but an intermittent circuit fault will return. Find and repair the wiring, connector, or solenoid causing the dropout.

Transmission Generic OBD-II Medium

What it means

P0744 means the transmission control module saw an intermittent electrical fault in the circuit that locks the torque converter clutch. That clutch couples the engine to the transmission at cruising speed to cut slippage; when the signal drops out it can't stay locked, so engine rpm rises at highway speed and fuel economy drops. It won't stop the car from starting or moving.

Medium

Can I keep driving? You can keep driving, but expect higher engine rpm at cruise, a possible shudder, and worse fuel economy — have it looked at before the fault turns constant.

Real-world scan data

Seen in

152

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

Higher-than-normal engine rpm at steady highway speed
Slight shudder or surging as the converter tries to lock
Reduced fuel economy
Check-engine light on (may come and go)

Common causes

Most likely first

Intermittent fault in the torque converter clutch (TCC) circuit wiring or connectorLikely
Failing TCC solenoidCommon
Low or contaminated transmission fluidCommon
Worn torque converter or its lock-up clutchLess often
Transmission control module (TCM) fault (rare)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data to see the conditions when the fault set.
Inspect the TCC circuit wiring and connectors for chafing, corrosion, or loose pins — the usual cause of an intermittent code.
Check transmission fluid level and condition; top up or service if dirty.
Test the TCC solenoid resistance and operation; replace if out of spec.
If wiring and solenoid are good, suspect the TCM last. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P0744?+

Short-term yes. The converter clutch just isn't locking reliably, so you'll see higher cruising rpm and slightly worse mileage. Fix it before it becomes a constant fault or causes converter wear.

Can I just clear P0744?+

You can, but an intermittent circuit fault will return. Find and repair the wiring, connector, or solenoid causing the dropout.

Read & clear P0744 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