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Home / DTC / P0744 — Torque Converter Clutch Circuit Intermittent

P0744 — Torque Converter Clutch Circuit Intermittent

Detailed page for trouble code P0744.

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Code

P0744

Generic P — Powertrain

Torque Converter Clutch Circuit Intermittent

Brand: Generic
Type: P — Powertrain
Views: UK: 39 EN: 79 RU: 77
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or corroded TCC solenoid connector or wiring (intermittent open/short)
  • Loose, damaged or fatigued wiring harness or pin(s)
  • Intermittent TCC solenoid failure
  • Poor ground or low battery/charging system voltage during operation
  • Contaminated, low, or overheated transmission fluid causing solenoid/vavle body issues
  • Intermittent PCM driver or internal PCM fault

Symptoms

  • Check Engine/Transmission warning lamp illuminated (MIL or TCM light)
  • Intermittent torque converter lockup (surging, juddering, vibration)
  • Reduced fuel economy or poor highway drivability
  • Transmission may slip or shift harshly when TCC command is active
  • May set only under certain temperatures, loads, or road speeds

What to check

  • Read freeze frame/continuous data and related transmission codes before clearing
  • Visually inspect TCC solenoid connector and harness for corrosion, damage, pin looseness
  • Check battery/charging system voltage and engine grounds
  • Check transmission fluid level, color and smell (overheating/contamination)
  • Back-probe connector and monitor voltage and signal while operating/road testing
  • Scan for intermittent codes by performing several drive cycles after repairs

Signal parameters

  • Control voltage: typically 0–12 V (PCM uses ground or battery-side switching depending on design)
  • PWM duty cycle: varies with command (0–100%); PCM commonly uses PWM to modulate TCC lockup
  • Typical solenoid resistance (generic): ~10–40 ohms (vehicle-specific — consult OEM spec)
  • Expected continuity: low resistance between solenoid pins; open or very high resistance indicates open circuit
  • When commanded ON, circuit should show change in voltage/duty; intermittent or erratic readings indicate a problem

Diagnostic algorithm

  1. Retrieve all stored codes and freeze frame data. Note related transmission codes and conditions when fault set.
  2. Inspect the TCC solenoid connector and wiring harness for corrosion, loose pins, broken wires, chafing, or repair splices. Wiggle test while monitoring for changes.
  3. Check battery voltage and engine/transmission grounds. Repair any poor ground or charging issues.
  4. Measure solenoid resistance (with connector disconnected). Compare to OEM spec; replace solenoid if out of range or intermittent.
  5. Back-probe the connector and monitor control voltage/duty cycle with a DVOM or oscilloscope while commanding TCC on/off (using scan tool) and during road test. Look for intermittent loss, spikes, or short to battery/ground.
  6. If intermittent signal is present at connector but not at PCM, inspect wiring between connector and PCM for opens/shorts and perform connector pin tension checks.
  7. If wiring checks are good and solenoid operation is erratic, replace the solenoid/valve body component per OEM procedure and drain/refill fluid if contaminated.
  8. If wiring and solenoid are good, consider PCM driver fault — verify with OEM diagnostics, check for available reflash/TSB, and only replace PCM after confirming other causes.
  9. Clear codes, perform multiple drive cycles including conditions that originally set the code, and verify repair. Monitor for recurrence.

Likely causes

  • Intermittent open/short at TCC solenoid connector (most common)
  • Failing/dirty TCC solenoid or sticking valve within the valve body
  • Corroded terminal or poor ground at transmission harness
  • Intermittent PCM driver or software issue (less common)

Fault status

⚠️ Status
PCM detected an intermittent fault or unexpected behavior in the torque converter clutch control circuit; electrical continuity or signal timing varied from expected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

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P0740 P0741 P0742 P2760 P0776
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Code

P0744

GWM P — Powertrain

- Malfunction in the clutch chain

Brand: GWM
Type: P — Powertrain
Views: UK: 16 EN: 35 RU: 36
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or corroded TCC solenoid connector or wiring (intermittent open/short)
  • Loose, damaged or fatigued wiring harness or pin(s)
  • Intermittent TCC solenoid failure
  • Poor ground or low battery/charging system voltage during operation
  • Contaminated, low, or overheated transmission fluid causing solenoid/vavle body issues
  • Intermittent PCM driver or internal PCM fault

Symptoms

  • Check Engine/Transmission warning lamp illuminated (MIL or TCM light)
  • Intermittent torque converter lockup (surging, juddering, vibration)
  • Reduced fuel economy or poor highway drivability
  • Transmission may slip or shift harshly when TCC command is active
  • May set only under certain temperatures, loads, or road speeds

What to check

  • Read freeze frame/continuous data and related transmission codes before clearing
  • Visually inspect TCC solenoid connector and harness for corrosion, damage, pin looseness
  • Check battery/charging system voltage and engine grounds
  • Check transmission fluid level, color and smell (overheating/contamination)
  • Back-probe connector and monitor voltage and signal while operating/road testing
  • Scan for intermittent codes by performing several drive cycles after repairs

Signal parameters

  • Control voltage: typically 0–12 V (PCM uses ground or battery-side switching depending on design)
  • PWM duty cycle: varies with command (0–100%); PCM commonly uses PWM to modulate TCC lockup
  • Typical solenoid resistance (generic): ~10–40 ohms (vehicle-specific — consult OEM spec)
  • Expected continuity: low resistance between solenoid pins; open or very high resistance indicates open circuit
  • When commanded ON, circuit should show change in voltage/duty; intermittent or erratic readings indicate a problem

Diagnostic algorithm

  1. Retrieve all stored codes and freeze frame data. Note related transmission codes and conditions when fault set.
  2. Inspect the TCC solenoid connector and wiring harness for corrosion, loose pins, broken wires, chafing, or repair splices. Wiggle test while monitoring for changes.
  3. Check battery voltage and engine/transmission grounds. Repair any poor ground or charging issues.
  4. Measure solenoid resistance (with connector disconnected). Compare to OEM spec; replace solenoid if out of range or intermittent.
  5. Back-probe the connector and monitor control voltage/duty cycle with a DVOM or oscilloscope while commanding TCC on/off (using scan tool) and during road test. Look for intermittent loss, spikes, or short to battery/ground.
  6. If intermittent signal is present at connector but not at PCM, inspect wiring between connector and PCM for opens/shorts and perform connector pin tension checks.
  7. If wiring checks are good and solenoid operation is erratic, replace the solenoid/valve body component per OEM procedure and drain/refill fluid if contaminated.
  8. If wiring and solenoid are good, consider PCM driver fault — verify with OEM diagnostics, check for available reflash/TSB, and only replace PCM after confirming other causes.
  9. Clear codes, perform multiple drive cycles including conditions that originally set the code, and verify repair. Monitor for recurrence.

Likely causes

  • Intermittent open/short at TCC solenoid connector (most common)
  • Failing/dirty TCC solenoid or sticking valve within the valve body
  • Corroded terminal or poor ground at transmission harness
  • Intermittent PCM driver or software issue (less common)

Fault status

⚠️ Status
PCM detected an intermittent fault or unexpected behavior in the torque converter clutch control circuit; electrical continuity or signal timing varied from expected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

P0740 P0741 P0742 P2760 P0776
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Code

P0744

HUMMER P — Powertrain

Torque Converter Clutch Circuit Intermittent

Brand: HUMMER
Type: P — Powertrain
Views: UK: 23 EN: 54 RU: 55
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or corroded TCC solenoid connector or wiring (intermittent open/short)
  • Loose, damaged or fatigued wiring harness or pin(s)
  • Intermittent TCC solenoid failure
  • Poor ground or low battery/charging system voltage during operation
  • Contaminated, low, or overheated transmission fluid causing solenoid/vavle body issues
  • Intermittent PCM driver or internal PCM fault

Symptoms

  • Check Engine/Transmission warning lamp illuminated (MIL or TCM light)
  • Intermittent torque converter lockup (surging, juddering, vibration)
  • Reduced fuel economy or poor highway drivability
  • Transmission may slip or shift harshly when TCC command is active
  • May set only under certain temperatures, loads, or road speeds

What to check

  • Read freeze frame/continuous data and related transmission codes before clearing
  • Visually inspect TCC solenoid connector and harness for corrosion, damage, pin looseness
  • Check battery/charging system voltage and engine grounds
  • Check transmission fluid level, color and smell (overheating/contamination)
  • Back-probe connector and monitor voltage and signal while operating/road testing
  • Scan for intermittent codes by performing several drive cycles after repairs

Signal parameters

  • Control voltage: typically 0–12 V (PCM uses ground or battery-side switching depending on design)
  • PWM duty cycle: varies with command (0–100%); PCM commonly uses PWM to modulate TCC lockup
  • Typical solenoid resistance (generic): ~10–40 ohms (vehicle-specific — consult OEM spec)
  • Expected continuity: low resistance between solenoid pins; open or very high resistance indicates open circuit
  • When commanded ON, circuit should show change in voltage/duty; intermittent or erratic readings indicate a problem

Diagnostic algorithm

  1. Retrieve all stored codes and freeze frame data. Note related transmission codes and conditions when fault set.
  2. Inspect the TCC solenoid connector and wiring harness for corrosion, loose pins, broken wires, chafing, or repair splices. Wiggle test while monitoring for changes.
  3. Check battery voltage and engine/transmission grounds. Repair any poor ground or charging issues.
  4. Measure solenoid resistance (with connector disconnected). Compare to OEM spec; replace solenoid if out of range or intermittent.
  5. Back-probe the connector and monitor control voltage/duty cycle with a DVOM or oscilloscope while commanding TCC on/off (using scan tool) and during road test. Look for intermittent loss, spikes, or short to battery/ground.
  6. If intermittent signal is present at connector but not at PCM, inspect wiring between connector and PCM for opens/shorts and perform connector pin tension checks.
  7. If wiring checks are good and solenoid operation is erratic, replace the solenoid/valve body component per OEM procedure and drain/refill fluid if contaminated.
  8. If wiring and solenoid are good, consider PCM driver fault — verify with OEM diagnostics, check for available reflash/TSB, and only replace PCM after confirming other causes.
  9. Clear codes, perform multiple drive cycles including conditions that originally set the code, and verify repair. Monitor for recurrence.

Likely causes

  • Intermittent open/short at TCC solenoid connector (most common)
  • Failing/dirty TCC solenoid or sticking valve within the valve body
  • Corroded terminal or poor ground at transmission harness
  • Intermittent PCM driver or software issue (less common)

Fault status

⚠️ Status
PCM detected an intermittent fault or unexpected behavior in the torque converter clutch control circuit; electrical continuity or signal timing varied from expected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

P0740 P0741 P0742 P2760 P0776
Repair manuals

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69

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Code

P0744

LAND ROVER P — Powertrain

Torque Converter Clutch Solenoid - Intermittent Circuit

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 18 EN: 44 RU: 48
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or corroded TCC solenoid connector or wiring (intermittent open/short)
  • Loose, damaged or fatigued wiring harness or pin(s)
  • Intermittent TCC solenoid failure
  • Poor ground or low battery/charging system voltage during operation
  • Contaminated, low, or overheated transmission fluid causing solenoid/vavle body issues
  • Intermittent PCM driver or internal PCM fault

Symptoms

  • Check Engine/Transmission warning lamp illuminated (MIL or TCM light)
  • Intermittent torque converter lockup (surging, juddering, vibration)
  • Reduced fuel economy or poor highway drivability
  • Transmission may slip or shift harshly when TCC command is active
  • May set only under certain temperatures, loads, or road speeds

What to check

  • Read freeze frame/continuous data and related transmission codes before clearing
  • Visually inspect TCC solenoid connector and harness for corrosion, damage, pin looseness
  • Check battery/charging system voltage and engine grounds
  • Check transmission fluid level, color and smell (overheating/contamination)
  • Back-probe connector and monitor voltage and signal while operating/road testing
  • Scan for intermittent codes by performing several drive cycles after repairs

Signal parameters

  • Control voltage: typically 0–12 V (PCM uses ground or battery-side switching depending on design)
  • PWM duty cycle: varies with command (0–100%); PCM commonly uses PWM to modulate TCC lockup
  • Typical solenoid resistance (generic): ~10–40 ohms (vehicle-specific — consult OEM spec)
  • Expected continuity: low resistance between solenoid pins; open or very high resistance indicates open circuit
  • When commanded ON, circuit should show change in voltage/duty; intermittent or erratic readings indicate a problem

Diagnostic algorithm

  1. Retrieve all stored codes and freeze frame data. Note related transmission codes and conditions when fault set.
  2. Inspect the TCC solenoid connector and wiring harness for corrosion, loose pins, broken wires, chafing, or repair splices. Wiggle test while monitoring for changes.
  3. Check battery voltage and engine/transmission grounds. Repair any poor ground or charging issues.
  4. Measure solenoid resistance (with connector disconnected). Compare to OEM spec; replace solenoid if out of range or intermittent.
  5. Back-probe the connector and monitor control voltage/duty cycle with a DVOM or oscilloscope while commanding TCC on/off (using scan tool) and during road test. Look for intermittent loss, spikes, or short to battery/ground.
  6. If intermittent signal is present at connector but not at PCM, inspect wiring between connector and PCM for opens/shorts and perform connector pin tension checks.
  7. If wiring checks are good and solenoid operation is erratic, replace the solenoid/valve body component per OEM procedure and drain/refill fluid if contaminated.
  8. If wiring and solenoid are good, consider PCM driver fault — verify with OEM diagnostics, check for available reflash/TSB, and only replace PCM after confirming other causes.
  9. Clear codes, perform multiple drive cycles including conditions that originally set the code, and verify repair. Monitor for recurrence.

Likely causes

  • Intermittent open/short at TCC solenoid connector (most common)
  • Failing/dirty TCC solenoid or sticking valve within the valve body
  • Corroded terminal or poor ground at transmission harness
  • Intermittent PCM driver or software issue (less common)

Fault status

⚠️ Status
PCM detected an intermittent fault or unexpected behavior in the torque converter clutch control circuit; electrical continuity or signal timing varied from expected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

P0740 P0741 P0742 P2760 P0776
160

Browse 160 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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Code

P0744

MERCEDES-BENZ P — Powertrain

Torque Converter Clutch Circuit Intermittent

Brand: MERCEDES-BENZ
Type: P — Powertrain
Views: UK: 26 EN: 69 RU: 63
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or corroded TCC solenoid connector or wiring (intermittent open/short)
  • Loose, damaged or fatigued wiring harness or pin(s)
  • Intermittent TCC solenoid failure
  • Poor ground or low battery/charging system voltage during operation
  • Contaminated, low, or overheated transmission fluid causing solenoid/vavle body issues
  • Intermittent PCM driver or internal PCM fault

Symptoms

  • Check Engine/Transmission warning lamp illuminated (MIL or TCM light)
  • Intermittent torque converter lockup (surging, juddering, vibration)
  • Reduced fuel economy or poor highway drivability
  • Transmission may slip or shift harshly when TCC command is active
  • May set only under certain temperatures, loads, or road speeds

What to check

  • Read freeze frame/continuous data and related transmission codes before clearing
  • Visually inspect TCC solenoid connector and harness for corrosion, damage, pin looseness
  • Check battery/charging system voltage and engine grounds
  • Check transmission fluid level, color and smell (overheating/contamination)
  • Back-probe connector and monitor voltage and signal while operating/road testing
  • Scan for intermittent codes by performing several drive cycles after repairs

Signal parameters

  • Control voltage: typically 0–12 V (PCM uses ground or battery-side switching depending on design)
  • PWM duty cycle: varies with command (0–100%); PCM commonly uses PWM to modulate TCC lockup
  • Typical solenoid resistance (generic): ~10–40 ohms (vehicle-specific — consult OEM spec)
  • Expected continuity: low resistance between solenoid pins; open or very high resistance indicates open circuit
  • When commanded ON, circuit should show change in voltage/duty; intermittent or erratic readings indicate a problem

Diagnostic algorithm

  1. Retrieve all stored codes and freeze frame data. Note related transmission codes and conditions when fault set.
  2. Inspect the TCC solenoid connector and wiring harness for corrosion, loose pins, broken wires, chafing, or repair splices. Wiggle test while monitoring for changes.
  3. Check battery voltage and engine/transmission grounds. Repair any poor ground or charging issues.
  4. Measure solenoid resistance (with connector disconnected). Compare to OEM spec; replace solenoid if out of range or intermittent.
  5. Back-probe the connector and monitor control voltage/duty cycle with a DVOM or oscilloscope while commanding TCC on/off (using scan tool) and during road test. Look for intermittent loss, spikes, or short to battery/ground.
  6. If intermittent signal is present at connector but not at PCM, inspect wiring between connector and PCM for opens/shorts and perform connector pin tension checks.
  7. If wiring checks are good and solenoid operation is erratic, replace the solenoid/valve body component per OEM procedure and drain/refill fluid if contaminated.
  8. If wiring and solenoid are good, consider PCM driver fault — verify with OEM diagnostics, check for available reflash/TSB, and only replace PCM after confirming other causes.
  9. Clear codes, perform multiple drive cycles including conditions that originally set the code, and verify repair. Monitor for recurrence.

Likely causes

  • Intermittent open/short at TCC solenoid connector (most common)
  • Failing/dirty TCC solenoid or sticking valve within the valve body
  • Corroded terminal or poor ground at transmission harness
  • Intermittent PCM driver or software issue (less common)

Fault status

⚠️ Status
PCM detected an intermittent fault or unexpected behavior in the torque converter clutch control circuit; electrical continuity or signal timing varied from expected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

P0740 P0741 P0742 P2760 P0776
133

Browse 133 MERCEDES-BENZ manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MERCEDES-BENZ

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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