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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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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

  • Open or shorted wiring to the pressure control solenoid
  • Corroded/poor connector or pin contact
  • Failed pressure control solenoid (coil or valve stuck)
  • Low, contaminated, or degraded transmission fluid
  • Internal valve body or hydraulic circuit contamination or wear
  • Faulty PCM/TCM or driver circuit

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated and P0745 stored
  • Harsh, delayed or erratic shifts
  • Transmission slipping or inability to maintain gear under load
  • Torque converter lockup problems (shudder, no lockup, or stuck locked)
  • Reduced fuel economy or drivability complaints
  • Possible limp-in mode with restricted performance

What to check

  • Retrieve freeze frame and live data with a scan tool; note transmission temperature and related transmission PIDs
  • Check transmission fluid level and condition (color, smell, contamination)
  • Perform visual inspection of solenoid connector and harness for damage, corrosion, water ingress or loose pins
  • Backprobe connector with key ON and measure reference voltage to solenoid (battery voltage expected on the supply side on many systems)
  • Measure solenoid coil resistance with multimeter and compare to spec; check for short to ground or power
  • Using a scan tool, command/activate Pressure Control Solenoid A and observe PID response and pressure/shift behavior

Signal parameters

  • Supply voltage (Key ON, engine OFF): ~battery voltage (approx 11–14 V) on supply terminal — verify exact spec in service manual
  • Typical solenoid coil resistance (cold): approximate range 10–40 ohms (consult OEM spec for exact value)
  • PWM control: duty cycle 0–100% depending on commanded pressure; frequency typically 20–250 Hz depending on model — consult service data
  • Expected behavior when commanded by scan tool: PID or measured line pressure should change proportional to duty cycle/command

Diagnostic algorithm

  1. Read and record freeze-frame, pending codes and live transmission data. Note transmission temp and any related codes.
  2. Visually inspect fluid level/condition and top/replace as required. If fluid is severely contaminated, plan for filter/pan/valve-body inspection.
  3. Inspect harness and connector at Pressure Control Solenoid A for corrosion, bent pins, loose fit, or damage. Repair connectors/wiring as needed.
  4. With connector disconnected, measure coil resistance across solenoid terminals. Compare to OEM spec. If out of range or infinite/near zero, replace solenoid.
  5. With key ON (engine OFF) backprobe for supply voltage on the solenoid power terminal; verify constant battery voltage. Backprobe control terminal while commanding solenoid ON with scan tool; observe switching to ground or PWM waveform and corresponding voltage changes.
  6. Check continuity between the PCM/TCM control driver pin and the solenoid connector; check for shorts to ground or battery. If PCM driver is stuck or shows no switching when commanded, suspect control module or wiring.
  7. Command the solenoid with a bidirectional scan tool while watching live pressure/shift PIDs or performing a controlled road test. If commands do not affect pressure/shifts but solenoid wiring and power are good, remove valve body for inspection (filter/strainer/debris) or replace solenoid.
  8. If wiring and hydraulic paths test good but intermittent or unexplained faults persist, consider replacement of solenoid and retest. If fault remains after replacement, test/replace PCM/TCM only after exhausting wiring and mechanical checks.
  9. Clear codes and perform a road test to confirm repair; monitor live data and re-check for return of P0745.

Likely causes

  • Damaged harness insulation or chafed wire causing intermittent open/short
  • Connector corrosion or bent/missing terminal causing high resistance
  • Solenoid coil internal short or open circuit
  • Carbon/debris in valve body preventing solenoid valve movement
  • Low fluid level or wrong fluid type causing incorrect hydraulic pressure
  • PCM/TCM output transistor failed or poor ground/circuit common

Fault status

⚠️ Status
Powertrain DTC P0745 stored — Pressure Control Solenoid A circuit fault. MIL on; transmission may enter limp mode or exhibit harsh/erratic shifts. Inspect solenoid, wiring, connectors, and hydraulic condition.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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