P0744 2003 Nissan Altima Sedan Code - Torque Converter Clutch Circuit Intermittent
Quick Answer
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). Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Torque Converter Clutch (TCC) Solenoid Valve. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0744 2003 Nissan Altima Sedan indicates Torque Converter Clutch Circuit Intermittent.
- Common causes
- Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Torque Converter Clutch (TCC) Solenoid Valve.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0744 2003 Nissan Altima Sedan Description
The 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 conditions, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.
The Diagnostic Trouble Code (DTC) P0744 is detected when A/T cannot perform lock-up even if the electrical circuit is good.
What are the Possible Causes of the DTC P0744 2003 Nissan Altima Sedan?
- Low transmission fluid level
- Dirty transmission fluid
- Faulty Torque Converter Clutch (TCC) Solenoid Valve
- Torque Converter Clutch Solenoid Valve harness is open or shorted
- Torque Converter Clutch Solenoid Valve circuit poor electrical connection
How to Fix the DTC P0744 2003 Nissan Altima Sedan?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0744 2003 Nissan Altima Sedan code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0744 2003 Nissan Altima Sedan Code
What does the OBDII code P0744 mean on a 2003 Nissan Altima?
P0744 indicates "Torque Converter Clutch Circuit Intermittent," meaning the transmission control module (TCM) has detected irregularities in the torque converter clutch (TCC) circuit.
What are the symptoms of code P0744 in a 2003 Nissan Altima?
Common symptoms include transmission slipping, reduced fuel efficiency, difficulty shifting gears, engine stalling at low speeds, and the check engine light turning on.
What causes the P0744 code to appear in a 2003 Nissan Altima?
Possible causes include a faulty torque converter clutch solenoid, low or dirty transmission fluid, wiring issues in the TCC circuit, or a malfunctioning transmission control module.
Can driving with code P0744 damage my 2003 Nissan Altima?
Yes, driving with this code can lead to further transmission damage if not addressed promptly, as the torque converter may not function properly.
How can I diagnose the P0744 code on my 2003 Nissan Altima?
Use an OBDII scanner to confirm the code, check the transmission fluid level and condition, inspect the TCC solenoid and wiring, and test the voltage at the TCC circuit.
How do I fix the P0744 code on a 2003 Nissan Altima?
Repairs may include replacing the torque converter clutch solenoid, cleaning or replacing the transmission fluid, repairing damaged wiring, or reprogramming or replacing the TCM if necessary.
Is replacing the transmission fluid a possible fix for the P0744 code?
Yes, if the code is caused by low or dirty transmission fluid, replacing or flushing the fluid can sometimes resolve the issue.
How much does it cost to repair the P0744 code on a 2003 Nissan Altima?
The repair cost can vary widely, ranging from $100–$300 for fluid replacement or wiring repairs to $700–$1,500 for solenoid or TCM replacement.
Can a bad torque converter cause the P0744 code?
Yes, a faulty torque converter or internal transmission issues can trigger the P0744 code if the torque converter clutch fails to engage properly.
Should I clear the P0744 code after repairs on my 2003 Nissan Altima?
Yes, after completing repairs, clear the code with an OBDII scanner and test-drive the vehicle to ensure the issue has been resolved.
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