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Home / DTC / P0749 — Pressure Control Solenoid A Intermittent

P0749 — Pressure Control Solenoid A Intermittent

Detailed page for trouble code P0749.

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11,914generic
22,491specific
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Code

P0749

Generic P — Powertrain

Pressure Control Solenoid A Intermittent

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Intermittent or corroded wiring/connector to Pressure Control Solenoid A
  • Faulty Pressure Control Solenoid A (internal intermittent coil or connector)
  • Corroded/contaminated transmission fluid or valve body causing intermittent solenoid response
  • Intermittent TCM/ECM driver or internal electronic fault
  • Low battery/poor ground or voltage spikes affecting solenoid drive
  • Poor mechanical seating/loose pin in connector or harness chafing

Symptoms

  • Check Engine / MIL illuminated (transmission-related code)
  • Intermittent harsh shifts, flare or slipping during gear changes
  • Delayed upshift or downshift, erratic shift timing
  • Transmission may enter limp/limitation mode intermittently
  • Possible abnormal line pressure behavior or TCC (torque converter clutch) issues

What to check

  • Retrieve freeze frame and stored data with a capable scan tool
  • Check for other transmission-related DTCs (P07xx, P07xx, P075x, P0700)
  • Visually inspect wiring and connector at the solenoid and along harness for damage, corrosion, or water intrusion
  • Check transmission fluid level and condition (contamination, burnt smell)
  • Backprobe solenoid connector while monitoring commands with scan tool (observe voltage/duty and continuity)
  • Measure solenoid coil resistance and compare to vehicle-specific spec

Signal parameters

  • Control: PCM/TCM PWM (duty-cycle) or switched 12 V pulse — typical control is PWM 0–100% duty
  • Command frequency: commonly 50–300 Hz (varies by manufacturer)
  • Supply voltage: nominal 9–13.5 V during operation
  • Typical coil resistance (generic): ~8–30 ohms (vehicle-specific values vary)
  • Expected behavior: commanded duty or voltage correlates with measured line pressure or reported pressure control status

Diagnostic algorithm

  1. Read and record freeze frame and all transmission DTCs; clear codes and attempt to reproduce P0749
  2. Use a scan tool to monitor Pressure Control Solenoid A command (duty/voltage) and measured transmission pressure or related PID while driving to reproduce the fault
  3. Perform visual inspection of solenoid connector and harness; check for corrosion, bent pins, water intrusion, or insulation damage
  4. Measure solenoid coil resistance at the connector and compare to vehicle spec; check for intermittent reading with wiggle test
  5. Backprobe connector and monitor voltage while commanding the solenoid ON/OFF from the scan tool. Verify PWM duty and voltage are present and stable when commanded
  6. Check supply and ground circuits for the solenoid: verify good battery voltage and solid ground at connector; check continuity to TCM/ECM
  7. If wiring and supply are good but operation is intermittent, bench-test or swap solenoid (if practical) to verify solenoid function
  8. Inspect transmission fluid and valve body for contamination or debris; replace/filter fluid if contaminated and consider valve body service if sticking is suspected
  9. If wiring and solenoid test good and intermittent control from the TCM is suspected, test TCM outputs per manufacturer procedures or consult updated TSBs; replace/controller only after isolating fault
  10. After repairs, clear codes and road-test to confirm code does not return and transmission behavior is restored

Likely causes

  • Wiring harness/connector corrosion or broken wire (most common)
  • Intermittent solenoid coil failure
  • Contaminated fluid or valve body contamination affecting solenoid operation
  • Intermittent TCM driver or poor ground

Fault status

⚠️ Status
P0749 — Pressure Control Solenoid A Intermittent: intermittent/erratic operation detected in the Pressure Control Solenoid A circuit. Check wiring, connector, solenoid, transmission fluid/valve body, and TCM.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P0740 P0741 P0742 P0750 P0755 P0700
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Code

P0749

GWM P — Powertrain

- Pressure Solenoid Malfunction

Brand: GWM
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Intermittent or corroded wiring/connector to Pressure Control Solenoid A
  • Faulty Pressure Control Solenoid A (internal intermittent coil or connector)
  • Corroded/contaminated transmission fluid or valve body causing intermittent solenoid response
  • Intermittent TCM/ECM driver or internal electronic fault
  • Low battery/poor ground or voltage spikes affecting solenoid drive
  • Poor mechanical seating/loose pin in connector or harness chafing

Symptoms

  • Check Engine / MIL illuminated (transmission-related code)
  • Intermittent harsh shifts, flare or slipping during gear changes
  • Delayed upshift or downshift, erratic shift timing
  • Transmission may enter limp/limitation mode intermittently
  • Possible abnormal line pressure behavior or TCC (torque converter clutch) issues

What to check

  • Retrieve freeze frame and stored data with a capable scan tool
  • Check for other transmission-related DTCs (P07xx, P07xx, P075x, P0700)
  • Visually inspect wiring and connector at the solenoid and along harness for damage, corrosion, or water intrusion
  • Check transmission fluid level and condition (contamination, burnt smell)
  • Backprobe solenoid connector while monitoring commands with scan tool (observe voltage/duty and continuity)
  • Measure solenoid coil resistance and compare to vehicle-specific spec

Signal parameters

  • Control: PCM/TCM PWM (duty-cycle) or switched 12 V pulse — typical control is PWM 0–100% duty
  • Command frequency: commonly 50–300 Hz (varies by manufacturer)
  • Supply voltage: nominal 9–13.5 V during operation
  • Typical coil resistance (generic): ~8–30 ohms (vehicle-specific values vary)
  • Expected behavior: commanded duty or voltage correlates with measured line pressure or reported pressure control status

Diagnostic algorithm

  1. Read and record freeze frame and all transmission DTCs; clear codes and attempt to reproduce P0749
  2. Use a scan tool to monitor Pressure Control Solenoid A command (duty/voltage) and measured transmission pressure or related PID while driving to reproduce the fault
  3. Perform visual inspection of solenoid connector and harness; check for corrosion, bent pins, water intrusion, or insulation damage
  4. Measure solenoid coil resistance at the connector and compare to vehicle spec; check for intermittent reading with wiggle test
  5. Backprobe connector and monitor voltage while commanding the solenoid ON/OFF from the scan tool. Verify PWM duty and voltage are present and stable when commanded
  6. Check supply and ground circuits for the solenoid: verify good battery voltage and solid ground at connector; check continuity to TCM/ECM
  7. If wiring and supply are good but operation is intermittent, bench-test or swap solenoid (if practical) to verify solenoid function
  8. Inspect transmission fluid and valve body for contamination or debris; replace/filter fluid if contaminated and consider valve body service if sticking is suspected
  9. If wiring and solenoid test good and intermittent control from the TCM is suspected, test TCM outputs per manufacturer procedures or consult updated TSBs; replace/controller only after isolating fault
  10. After repairs, clear codes and road-test to confirm code does not return and transmission behavior is restored

Likely causes

  • Wiring harness/connector corrosion or broken wire (most common)
  • Intermittent solenoid coil failure
  • Contaminated fluid or valve body contamination affecting solenoid operation
  • Intermittent TCM driver or poor ground

Fault status

⚠️ Status
P0749 — Pressure Control Solenoid A Intermittent: intermittent/erratic operation detected in the Pressure Control Solenoid A circuit. Check wiring, connector, solenoid, transmission fluid/valve body, and TCM.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P0740 P0741 P0742 P0750 P0755 P0700
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Code

P0749

HUMMER P — Powertrain

Pressure Control Solenoid Intermittent

Brand: HUMMER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Intermittent or corroded wiring/connector to Pressure Control Solenoid A
  • Faulty Pressure Control Solenoid A (internal intermittent coil or connector)
  • Corroded/contaminated transmission fluid or valve body causing intermittent solenoid response
  • Intermittent TCM/ECM driver or internal electronic fault
  • Low battery/poor ground or voltage spikes affecting solenoid drive
  • Poor mechanical seating/loose pin in connector or harness chafing

Symptoms

  • Check Engine / MIL illuminated (transmission-related code)
  • Intermittent harsh shifts, flare or slipping during gear changes
  • Delayed upshift or downshift, erratic shift timing
  • Transmission may enter limp/limitation mode intermittently
  • Possible abnormal line pressure behavior or TCC (torque converter clutch) issues

What to check

  • Retrieve freeze frame and stored data with a capable scan tool
  • Check for other transmission-related DTCs (P07xx, P07xx, P075x, P0700)
  • Visually inspect wiring and connector at the solenoid and along harness for damage, corrosion, or water intrusion
  • Check transmission fluid level and condition (contamination, burnt smell)
  • Backprobe solenoid connector while monitoring commands with scan tool (observe voltage/duty and continuity)
  • Measure solenoid coil resistance and compare to vehicle-specific spec

Signal parameters

  • Control: PCM/TCM PWM (duty-cycle) or switched 12 V pulse — typical control is PWM 0–100% duty
  • Command frequency: commonly 50–300 Hz (varies by manufacturer)
  • Supply voltage: nominal 9–13.5 V during operation
  • Typical coil resistance (generic): ~8–30 ohms (vehicle-specific values vary)
  • Expected behavior: commanded duty or voltage correlates with measured line pressure or reported pressure control status

Diagnostic algorithm

  1. Read and record freeze frame and all transmission DTCs; clear codes and attempt to reproduce P0749
  2. Use a scan tool to monitor Pressure Control Solenoid A command (duty/voltage) and measured transmission pressure or related PID while driving to reproduce the fault
  3. Perform visual inspection of solenoid connector and harness; check for corrosion, bent pins, water intrusion, or insulation damage
  4. Measure solenoid coil resistance at the connector and compare to vehicle spec; check for intermittent reading with wiggle test
  5. Backprobe connector and monitor voltage while commanding the solenoid ON/OFF from the scan tool. Verify PWM duty and voltage are present and stable when commanded
  6. Check supply and ground circuits for the solenoid: verify good battery voltage and solid ground at connector; check continuity to TCM/ECM
  7. If wiring and supply are good but operation is intermittent, bench-test or swap solenoid (if practical) to verify solenoid function
  8. Inspect transmission fluid and valve body for contamination or debris; replace/filter fluid if contaminated and consider valve body service if sticking is suspected
  9. If wiring and solenoid test good and intermittent control from the TCM is suspected, test TCM outputs per manufacturer procedures or consult updated TSBs; replace/controller only after isolating fault
  10. After repairs, clear codes and road-test to confirm code does not return and transmission behavior is restored

Likely causes

  • Wiring harness/connector corrosion or broken wire (most common)
  • Intermittent solenoid coil failure
  • Contaminated fluid or valve body contamination affecting solenoid operation
  • Intermittent TCM driver or poor ground

Fault status

⚠️ Status
P0749 — Pressure Control Solenoid A Intermittent: intermittent/erratic operation detected in the Pressure Control Solenoid A circuit. Check wiring, connector, solenoid, transmission fluid/valve body, and TCM.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P0740 P0741 P0742 P0750 P0755 P0700
Repair manuals

Manual library for HUMMER

138

Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HUMMER

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Code

P0749

MERCEDES-BENZ P — Powertrain

Pressure Control Solenoid Intermittent

Brand: MERCEDES-BENZ
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Intermittent or corroded wiring/connector to Pressure Control Solenoid A
  • Faulty Pressure Control Solenoid A (internal intermittent coil or connector)
  • Corroded/contaminated transmission fluid or valve body causing intermittent solenoid response
  • Intermittent TCM/ECM driver or internal electronic fault
  • Low battery/poor ground or voltage spikes affecting solenoid drive
  • Poor mechanical seating/loose pin in connector or harness chafing

Symptoms

  • Check Engine / MIL illuminated (transmission-related code)
  • Intermittent harsh shifts, flare or slipping during gear changes
  • Delayed upshift or downshift, erratic shift timing
  • Transmission may enter limp/limitation mode intermittently
  • Possible abnormal line pressure behavior or TCC (torque converter clutch) issues

What to check

  • Retrieve freeze frame and stored data with a capable scan tool
  • Check for other transmission-related DTCs (P07xx, P07xx, P075x, P0700)
  • Visually inspect wiring and connector at the solenoid and along harness for damage, corrosion, or water intrusion
  • Check transmission fluid level and condition (contamination, burnt smell)
  • Backprobe solenoid connector while monitoring commands with scan tool (observe voltage/duty and continuity)
  • Measure solenoid coil resistance and compare to vehicle-specific spec

Signal parameters

  • Control: PCM/TCM PWM (duty-cycle) or switched 12 V pulse — typical control is PWM 0–100% duty
  • Command frequency: commonly 50–300 Hz (varies by manufacturer)
  • Supply voltage: nominal 9–13.5 V during operation
  • Typical coil resistance (generic): ~8–30 ohms (vehicle-specific values vary)
  • Expected behavior: commanded duty or voltage correlates with measured line pressure or reported pressure control status

Diagnostic algorithm

  1. Read and record freeze frame and all transmission DTCs; clear codes and attempt to reproduce P0749
  2. Use a scan tool to monitor Pressure Control Solenoid A command (duty/voltage) and measured transmission pressure or related PID while driving to reproduce the fault
  3. Perform visual inspection of solenoid connector and harness; check for corrosion, bent pins, water intrusion, or insulation damage
  4. Measure solenoid coil resistance at the connector and compare to vehicle spec; check for intermittent reading with wiggle test
  5. Backprobe connector and monitor voltage while commanding the solenoid ON/OFF from the scan tool. Verify PWM duty and voltage are present and stable when commanded
  6. Check supply and ground circuits for the solenoid: verify good battery voltage and solid ground at connector; check continuity to TCM/ECM
  7. If wiring and supply are good but operation is intermittent, bench-test or swap solenoid (if practical) to verify solenoid function
  8. Inspect transmission fluid and valve body for contamination or debris; replace/filter fluid if contaminated and consider valve body service if sticking is suspected
  9. If wiring and solenoid test good and intermittent control from the TCM is suspected, test TCM outputs per manufacturer procedures or consult updated TSBs; replace/controller only after isolating fault
  10. After repairs, clear codes and road-test to confirm code does not return and transmission behavior is restored

Likely causes

  • Wiring harness/connector corrosion or broken wire (most common)
  • Intermittent solenoid coil failure
  • Contaminated fluid or valve body contamination affecting solenoid operation
  • Intermittent TCM driver or poor ground

Fault status

⚠️ Status
P0749 — Pressure Control Solenoid A Intermittent: intermittent/erratic operation detected in the Pressure Control Solenoid A circuit. Check wiring, connector, solenoid, transmission fluid/valve body, and TCM.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P0740 P0741 P0742 P0750 P0755 P0700
856

Browse 856 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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