Code
P0744
GWM
P — Powertrain
- Malfunction in the clutch chain
AI status
Completed
Completed
100%
Causes
- Low, dirty, or degraded automatic transmission fluid (ATF)
- Faulty transmission control solenoid(s) or stuck solenoid spool
- Wiring harness damage, poor connector contact, or short/open to the transmission control module (TCM/PCM)
- Valve body contamination, worn valves, or internal clogging
- Worn clutch packs, piston, seals, or the mechanical clutch chain assembly
- Internal hydraulic leak or loss of line/servo pressure
Symptoms
- Check Engine / transmission warning lamp illuminated
- Poor acceleration or torque converter slip
- Transmission shuddering or harsh engagement
- Delayed or inconsistent lock‑up of torque converter
- Possible limp-home mode or reduced shift quality
- Unusual transmission noise (if mechanical wear present)
What to check
- Read freeze‑frame data and all related transmission codes with a scanner
- Inspect ATF level and condition (smell, color, metal debris)
- Visually inspect transmission wiring, connectors, and grounds
- Check battery/charging system voltage before testing solenoids
- Perform live data monitoring of TCC command and response during road test
- Measure solenoid coil resistance and check for proper supply voltage
Signal parameters
- TCC (clutch) solenoid commanded duty cycle or ON/OFF status (%)
- TCC engagement status (command vs actual)
- Transmission line pressure (kPa or psi) at idle and under load
- Engine RPM and vehicle speed during attempted lock‑up
- Transmission fluid temperature (°C/°F)
- Solenoid coil resistance (ohms) and supply voltage (V)
Diagnostic algorithm
- Confirm P0744 present and record freeze‑frame and related codes; do not assume single‑cause.
- Check ATF level and condition; correct level and replace fluid/filter if contaminated or degraded, then retest.
- Inspect all transmission wiring and connectors for damage, corrosion, or poor pin fit; repair as needed.
- Use a scan tool to command TCC/clutch solenoid and observe solenoid duty and TCC engagement in live data; note discrepancies.
- Measure solenoid coil resistance and supply/control voltages with ignition ON and during commanded activation; compare to spec.
- Measure transmission line/servo pressure with a pressure gauge while commanding/clutch activation; verify required pressure is achieved.
- If electrical and hydraulic tests fail to show fault, inspect valve body and solenoid assembly for sticking or contamination; clean or replace as required.
- If internal mechanical wear is suspected (clutch packs, chain, pistons, seals), consider transmission removal for internal inspection and repair or replacement.
- After repairs, clear codes and perform a thorough road test and final scan to confirm the fault does not return.
Likely causes
- Low or contaminated ATF causing reduced hydraulic pressure
- Faulty or intermittent TCC/clutch control solenoid
- Damaged wiring or corrosion at transmission connectors
- Valve body sticking or clogged passages
- Worn internal clutch components or failed clutch-chain mechanism
Fault status
Status
Malfunction detected in the transmission clutch/actuation chain—possible hydraulic, electrical, or internal mechanical failure affecting clutch engagement.
Repair difficulty: Hard
Diagnostic time: 2-6 hours
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