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Home / DTC / P0745 — Pressure Control Solenoid A

P0745 — Pressure Control Solenoid A

Detailed page for trouble code P0745.

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22,491specific
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Code

P0745

Generic P — Powertrain

Pressure Control Solenoid A

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

Causes

  • Faulty pressure control solenoid A (stuck, shorted, open or intermittent)
  • Damaged wiring or poor connector connection (open, short to ground/voltage, corrosion)
  • Low or contaminated transmission fluid
  • Faulty transmission range sensor or transmission control module
  • Valve body or internal hydraulic failure (stuck valve, debris)
  • Intermittent ground or battery supply issue

Symptoms

  • Check Engine / Transmission warning light illuminated
  • Harsh, delayed, or erratic shifting
  • Transmission slipping or inability to hold gear
  • Limp-home mode (reduced shift schedule)
  • Unusual transmission noise or harsh engagement
  • Poor drivability, degraded fuel economy

What to check

  • Read freeze frame and live data with a scan tool; note transmission-related data and solenoid command/status
  • Visually inspect transmission fluid level and condition (burnt smell, debris)
  • Inspect wiring harness and connector for damage, corrosion, loose terminals, or water intrusion
  • Backprobe solenoid connector to check reference voltage, ground and control signal while commanding solenoid ON/OFF
  • Measure solenoid coil resistance with ohmmeter (compare to spec or similar solenoids)
  • Perform wiggle test on harness while monitoring live data to find intermittent faults

Signal parameters

  • Solenoid coil resistance: typically about 10–50 ohms (varies by manufacturer) — compare to OEM spec
  • Control method: PCM/TCM uses PWM (pulse-width modulation); typical frequency range 50–300 Hz (varies by design)
  • Command duty cycle: 0–100% depending on requested pressure
  • Supply amplitude: signal referenced to battery voltage; control is usually a pulsed ground or pulsed positive driven by module
  • Expected behavior: resistance within spec, control signal present when commanded, and measurable pressure change when activated

Diagnostic algorithm

  1. Verify the code and note any other transmission codes. Scan for pending/frozen frame data and check for related codes.
  2. Inspect transmission fluid level and condition. Top or replace fluid if low/contaminated; retest.
  3. Visually inspect solenoid connector and wiring for damage, corrosion, pin push-out, or water intrusion. Repair as necessary.
  4. With ignition ON (engine off), disconnect connector and measure solenoid coil resistance. Compare to spec. Replace solenoid if out of range or open/shorted.
  5. Backprobe the connector with a scan tool while commanding the solenoid ON/OFF. Verify proper control signal (PWM) and reference voltage/ground. Check for intermittent signal while wiggling harness.
  6. If control signal present but solenoid does not actuate, bench-test or replace solenoid. If no control signal, check fuse/relay and PCM/TCM output circuit for shorts/open or poor ground.
  7. If wiring suspect, perform continuity and short-to-power/ground tests between PCM/TCM and solenoid connector. Repair any wiring faults.
  8. If electrical and fluid are good, check valve body/pressure circuits (hydraulic test) for stuck valves or contamination; perform transmission pressure test with gauge to confirm regulation.
  9. After repairs, clear codes, perform relearn procedures if required, and road test to confirm fix. Re-scan for recurrence.

Likely causes

  • Wiring harness chafed at frame or near connector
  • Corroded or bent solenoid connector pins
  • Solenoid coil internal failure (open or short)
  • Low fluid level or heavy contamination causing sticking
  • PCM/TCM driver output failure (less common)

Fault status

⚠️ Status
PCM detected a malfunction in the transmission pressure control solenoid A circuit or its operation. This may result in improper hydraulic pressure regulation and can trigger limp mode or degraded shift performance.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

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P0740 P0741 P0746 P0750 P0755 P0776
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Code

P0745

GWM P — Powertrain

- Malfunction in the solenoid pressure circuit

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

Causes

  • Faulty pressure control solenoid A (stuck, shorted, open or intermittent)
  • Damaged wiring or poor connector connection (open, short to ground/voltage, corrosion)
  • Low or contaminated transmission fluid
  • Faulty transmission range sensor or transmission control module
  • Valve body or internal hydraulic failure (stuck valve, debris)
  • Intermittent ground or battery supply issue

Symptoms

  • Check Engine / Transmission warning light illuminated
  • Harsh, delayed, or erratic shifting
  • Transmission slipping or inability to hold gear
  • Limp-home mode (reduced shift schedule)
  • Unusual transmission noise or harsh engagement
  • Poor drivability, degraded fuel economy

What to check

  • Read freeze frame and live data with a scan tool; note transmission-related data and solenoid command/status
  • Visually inspect transmission fluid level and condition (burnt smell, debris)
  • Inspect wiring harness and connector for damage, corrosion, loose terminals, or water intrusion
  • Backprobe solenoid connector to check reference voltage, ground and control signal while commanding solenoid ON/OFF
  • Measure solenoid coil resistance with ohmmeter (compare to spec or similar solenoids)
  • Perform wiggle test on harness while monitoring live data to find intermittent faults

Signal parameters

  • Solenoid coil resistance: typically about 10–50 ohms (varies by manufacturer) — compare to OEM spec
  • Control method: PCM/TCM uses PWM (pulse-width modulation); typical frequency range 50–300 Hz (varies by design)
  • Command duty cycle: 0–100% depending on requested pressure
  • Supply amplitude: signal referenced to battery voltage; control is usually a pulsed ground or pulsed positive driven by module
  • Expected behavior: resistance within spec, control signal present when commanded, and measurable pressure change when activated

Diagnostic algorithm

  1. Verify the code and note any other transmission codes. Scan for pending/frozen frame data and check for related codes.
  2. Inspect transmission fluid level and condition. Top or replace fluid if low/contaminated; retest.
  3. Visually inspect solenoid connector and wiring for damage, corrosion, pin push-out, or water intrusion. Repair as necessary.
  4. With ignition ON (engine off), disconnect connector and measure solenoid coil resistance. Compare to spec. Replace solenoid if out of range or open/shorted.
  5. Backprobe the connector with a scan tool while commanding the solenoid ON/OFF. Verify proper control signal (PWM) and reference voltage/ground. Check for intermittent signal while wiggling harness.
  6. If control signal present but solenoid does not actuate, bench-test or replace solenoid. If no control signal, check fuse/relay and PCM/TCM output circuit for shorts/open or poor ground.
  7. If wiring suspect, perform continuity and short-to-power/ground tests between PCM/TCM and solenoid connector. Repair any wiring faults.
  8. If electrical and fluid are good, check valve body/pressure circuits (hydraulic test) for stuck valves or contamination; perform transmission pressure test with gauge to confirm regulation.
  9. After repairs, clear codes, perform relearn procedures if required, and road test to confirm fix. Re-scan for recurrence.

Likely causes

  • Wiring harness chafed at frame or near connector
  • Corroded or bent solenoid connector pins
  • Solenoid coil internal failure (open or short)
  • Low fluid level or heavy contamination causing sticking
  • PCM/TCM driver output failure (less common)

Fault status

⚠️ Status
PCM detected a malfunction in the transmission pressure control solenoid A circuit or its operation. This may result in improper hydraulic pressure regulation and can trigger limp mode or degraded shift performance.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P0740 P0741 P0746 P0750 P0755 P0776
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Code

P0745

HUMMER P — Powertrain

Pressure Control Solenoid Malfunction

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

Causes

  • Faulty pressure control solenoid A (stuck, shorted, open or intermittent)
  • Damaged wiring or poor connector connection (open, short to ground/voltage, corrosion)
  • Low or contaminated transmission fluid
  • Faulty transmission range sensor or transmission control module
  • Valve body or internal hydraulic failure (stuck valve, debris)
  • Intermittent ground or battery supply issue

Symptoms

  • Check Engine / Transmission warning light illuminated
  • Harsh, delayed, or erratic shifting
  • Transmission slipping or inability to hold gear
  • Limp-home mode (reduced shift schedule)
  • Unusual transmission noise or harsh engagement
  • Poor drivability, degraded fuel economy

What to check

  • Read freeze frame and live data with a scan tool; note transmission-related data and solenoid command/status
  • Visually inspect transmission fluid level and condition (burnt smell, debris)
  • Inspect wiring harness and connector for damage, corrosion, loose terminals, or water intrusion
  • Backprobe solenoid connector to check reference voltage, ground and control signal while commanding solenoid ON/OFF
  • Measure solenoid coil resistance with ohmmeter (compare to spec or similar solenoids)
  • Perform wiggle test on harness while monitoring live data to find intermittent faults

Signal parameters

  • Solenoid coil resistance: typically about 10–50 ohms (varies by manufacturer) — compare to OEM spec
  • Control method: PCM/TCM uses PWM (pulse-width modulation); typical frequency range 50–300 Hz (varies by design)
  • Command duty cycle: 0–100% depending on requested pressure
  • Supply amplitude: signal referenced to battery voltage; control is usually a pulsed ground or pulsed positive driven by module
  • Expected behavior: resistance within spec, control signal present when commanded, and measurable pressure change when activated

Diagnostic algorithm

  1. Verify the code and note any other transmission codes. Scan for pending/frozen frame data and check for related codes.
  2. Inspect transmission fluid level and condition. Top or replace fluid if low/contaminated; retest.
  3. Visually inspect solenoid connector and wiring for damage, corrosion, pin push-out, or water intrusion. Repair as necessary.
  4. With ignition ON (engine off), disconnect connector and measure solenoid coil resistance. Compare to spec. Replace solenoid if out of range or open/shorted.
  5. Backprobe the connector with a scan tool while commanding the solenoid ON/OFF. Verify proper control signal (PWM) and reference voltage/ground. Check for intermittent signal while wiggling harness.
  6. If control signal present but solenoid does not actuate, bench-test or replace solenoid. If no control signal, check fuse/relay and PCM/TCM output circuit for shorts/open or poor ground.
  7. If wiring suspect, perform continuity and short-to-power/ground tests between PCM/TCM and solenoid connector. Repair any wiring faults.
  8. If electrical and fluid are good, check valve body/pressure circuits (hydraulic test) for stuck valves or contamination; perform transmission pressure test with gauge to confirm regulation.
  9. After repairs, clear codes, perform relearn procedures if required, and road test to confirm fix. Re-scan for recurrence.

Likely causes

  • Wiring harness chafed at frame or near connector
  • Corroded or bent solenoid connector pins
  • Solenoid coil internal failure (open or short)
  • Low fluid level or heavy contamination causing sticking
  • PCM/TCM driver output failure (less common)

Fault status

⚠️ Status
PCM detected a malfunction in the transmission pressure control solenoid A circuit or its operation. This may result in improper hydraulic pressure regulation and can trigger limp mode or degraded shift performance.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P0740 P0741 P0746 P0750 P0755 P0776
Repair manuals

Manual library for HUMMER

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Code

P0745

LAND ROVER P — Powertrain

Pressure Control Solenoid A

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

Causes

  • Faulty pressure control solenoid A (stuck, shorted, open or intermittent)
  • Damaged wiring or poor connector connection (open, short to ground/voltage, corrosion)
  • Low or contaminated transmission fluid
  • Faulty transmission range sensor or transmission control module
  • Valve body or internal hydraulic failure (stuck valve, debris)
  • Intermittent ground or battery supply issue

Symptoms

  • Check Engine / Transmission warning light illuminated
  • Harsh, delayed, or erratic shifting
  • Transmission slipping or inability to hold gear
  • Limp-home mode (reduced shift schedule)
  • Unusual transmission noise or harsh engagement
  • Poor drivability, degraded fuel economy

What to check

  • Read freeze frame and live data with a scan tool; note transmission-related data and solenoid command/status
  • Visually inspect transmission fluid level and condition (burnt smell, debris)
  • Inspect wiring harness and connector for damage, corrosion, loose terminals, or water intrusion
  • Backprobe solenoid connector to check reference voltage, ground and control signal while commanding solenoid ON/OFF
  • Measure solenoid coil resistance with ohmmeter (compare to spec or similar solenoids)
  • Perform wiggle test on harness while monitoring live data to find intermittent faults

Signal parameters

  • Solenoid coil resistance: typically about 10–50 ohms (varies by manufacturer) — compare to OEM spec
  • Control method: PCM/TCM uses PWM (pulse-width modulation); typical frequency range 50–300 Hz (varies by design)
  • Command duty cycle: 0–100% depending on requested pressure
  • Supply amplitude: signal referenced to battery voltage; control is usually a pulsed ground or pulsed positive driven by module
  • Expected behavior: resistance within spec, control signal present when commanded, and measurable pressure change when activated

Diagnostic algorithm

  1. Verify the code and note any other transmission codes. Scan for pending/frozen frame data and check for related codes.
  2. Inspect transmission fluid level and condition. Top or replace fluid if low/contaminated; retest.
  3. Visually inspect solenoid connector and wiring for damage, corrosion, pin push-out, or water intrusion. Repair as necessary.
  4. With ignition ON (engine off), disconnect connector and measure solenoid coil resistance. Compare to spec. Replace solenoid if out of range or open/shorted.
  5. Backprobe the connector with a scan tool while commanding the solenoid ON/OFF. Verify proper control signal (PWM) and reference voltage/ground. Check for intermittent signal while wiggling harness.
  6. If control signal present but solenoid does not actuate, bench-test or replace solenoid. If no control signal, check fuse/relay and PCM/TCM output circuit for shorts/open or poor ground.
  7. If wiring suspect, perform continuity and short-to-power/ground tests between PCM/TCM and solenoid connector. Repair any wiring faults.
  8. If electrical and fluid are good, check valve body/pressure circuits (hydraulic test) for stuck valves or contamination; perform transmission pressure test with gauge to confirm regulation.
  9. After repairs, clear codes, perform relearn procedures if required, and road test to confirm fix. Re-scan for recurrence.

Likely causes

  • Wiring harness chafed at frame or near connector
  • Corroded or bent solenoid connector pins
  • Solenoid coil internal failure (open or short)
  • Low fluid level or heavy contamination causing sticking
  • PCM/TCM driver output failure (less common)

Fault status

⚠️ Status
PCM detected a malfunction in the transmission pressure control solenoid A circuit or its operation. This may result in improper hydraulic pressure regulation and can trigger limp mode or degraded shift performance.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P0740 P0741 P0746 P0750 P0755 P0776
320

Browse 320 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

P0745

MERCEDES-BENZ P — Powertrain

Pressure Control Solenoid Malfunction

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

Causes

  • Faulty pressure control solenoid A (stuck, shorted, open or intermittent)
  • Damaged wiring or poor connector connection (open, short to ground/voltage, corrosion)
  • Low or contaminated transmission fluid
  • Faulty transmission range sensor or transmission control module
  • Valve body or internal hydraulic failure (stuck valve, debris)
  • Intermittent ground or battery supply issue

Symptoms

  • Check Engine / Transmission warning light illuminated
  • Harsh, delayed, or erratic shifting
  • Transmission slipping or inability to hold gear
  • Limp-home mode (reduced shift schedule)
  • Unusual transmission noise or harsh engagement
  • Poor drivability, degraded fuel economy

What to check

  • Read freeze frame and live data with a scan tool; note transmission-related data and solenoid command/status
  • Visually inspect transmission fluid level and condition (burnt smell, debris)
  • Inspect wiring harness and connector for damage, corrosion, loose terminals, or water intrusion
  • Backprobe solenoid connector to check reference voltage, ground and control signal while commanding solenoid ON/OFF
  • Measure solenoid coil resistance with ohmmeter (compare to spec or similar solenoids)
  • Perform wiggle test on harness while monitoring live data to find intermittent faults

Signal parameters

  • Solenoid coil resistance: typically about 10–50 ohms (varies by manufacturer) — compare to OEM spec
  • Control method: PCM/TCM uses PWM (pulse-width modulation); typical frequency range 50–300 Hz (varies by design)
  • Command duty cycle: 0–100% depending on requested pressure
  • Supply amplitude: signal referenced to battery voltage; control is usually a pulsed ground or pulsed positive driven by module
  • Expected behavior: resistance within spec, control signal present when commanded, and measurable pressure change when activated

Diagnostic algorithm

  1. Verify the code and note any other transmission codes. Scan for pending/frozen frame data and check for related codes.
  2. Inspect transmission fluid level and condition. Top or replace fluid if low/contaminated; retest.
  3. Visually inspect solenoid connector and wiring for damage, corrosion, pin push-out, or water intrusion. Repair as necessary.
  4. With ignition ON (engine off), disconnect connector and measure solenoid coil resistance. Compare to spec. Replace solenoid if out of range or open/shorted.
  5. Backprobe the connector with a scan tool while commanding the solenoid ON/OFF. Verify proper control signal (PWM) and reference voltage/ground. Check for intermittent signal while wiggling harness.
  6. If control signal present but solenoid does not actuate, bench-test or replace solenoid. If no control signal, check fuse/relay and PCM/TCM output circuit for shorts/open or poor ground.
  7. If wiring suspect, perform continuity and short-to-power/ground tests between PCM/TCM and solenoid connector. Repair any wiring faults.
  8. If electrical and fluid are good, check valve body/pressure circuits (hydraulic test) for stuck valves or contamination; perform transmission pressure test with gauge to confirm regulation.
  9. After repairs, clear codes, perform relearn procedures if required, and road test to confirm fix. Re-scan for recurrence.

Likely causes

  • Wiring harness chafed at frame or near connector
  • Corroded or bent solenoid connector pins
  • Solenoid coil internal failure (open or short)
  • Low fluid level or heavy contamination causing sticking
  • PCM/TCM driver output failure (less common)

Fault status

⚠️ Status
PCM detected a malfunction in the transmission pressure control solenoid A circuit or its operation. This may result in improper hydraulic pressure regulation and can trigger limp mode or degraded shift performance.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P0740 P0741 P0746 P0750 P0755 P0776
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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