P0964

Code

LAND ROVER P — Powertrain

Pressure Control Solenoid A Control - Circuit

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 10 EN: 21 RU: 21

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Page language: EN

Causes

Open or short in solenoid wiring harness (including chafed or broken wires)
Poor or corroded connector or terminal at solenoid or TCM
Faulty Pressure Control Solenoid A (coil short or open, internal failure)
Poor ground or low battery/ignition supply to transmission circuits
Faulty Transmission Control Module (TCM) output driver
Intermittent connection due to vibration or damaged insulation

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Transmission may default to limp/backup mode with limited gear availability
Harsh, delayed, or erratic shifts
Slipping or inability to engage drive or reverse
Unusual transmission noise or poor drivability
Possible stored transmission-related trouble codes besides P0964

What to check

Read and record all transmission-related codes and freeze-frame data with a diagnostic scanner
Verify battery voltage is within nominal range (with key on / engine running as required)
Visually inspect the transmission harness, connector, and solenoid connector for damage, corrosion, bent pins, or water intrusion
Check for related codes (other solenoid circuits, pressure sensors, TCM faults)
Back-probe solenoid connector and monitor command signal and supply voltage with scanner or multimeter while commanding solenoid on/off
Measure solenoid coil resistance at the solenoid connector (with wiring disconnected) and compare to specification

Signal parameters

Control type: PWM signal from TCM (pulse-width controls effective pressure)
Duty cycle: 0–100% (varies by commanded pressure) — expected to change with commanded pressure
Frequency: typically tens to a few hundred Hz (vehicle-specific)
Supply voltage: battery/ignition supply ~11–14 V (verify exact depending on key/run state)
Coil resistance (typical range): commonly in the single- to low-double digit ohms up to a few tens of ohms (e.g., ~8–40 Ω) — consult the specific Land Rover service manual for exact spec
When commanded ON, driver usually pulses ground from TCM (verify polarity and behavior with service data)

Diagnostic algorithm

Confirm and record the code(s) and any freeze-frame data; clear codes and perform a test drive to see if P0964 returns
Check battery voltage and charger state. Low voltage can cause false electrical faults.
Perform a visual inspection of the transmission solenoid harness and connectors for damage, corrosion, or loose pins.
Disconnect the solenoid connector; measure coil resistance across solenoid terminals with a DMM and compare to factory spec. Replace solenoid if out of range.
With harness disconnected, check resistance from each solenoid terminal to vehicle ground to confirm there is no short to ground.
Reconnect harness. Back-probe the solenoid connector; command the solenoid ON/OFF with a scan tool while measuring voltage/pulse. Verify PWM duty cycle and voltage follow commands.
Wiggle the harness and connectors while monitoring live data/command parameters to check for intermittent faults.
If wiring checks good but solenoid does not respond or driver behaves unusually, inspect TCM connector pins and grounds. If all wiring and solenoid are good, consider TCM output driver failure and perform TCM bench/diagnostic tests per factory procedures.
After repairs, clear codes and perform extended road test to verify the fault does not return and the transmission shifts normally.

Likely causes

Open or shorted wiring to Pressure Control Solenoid A
Corroded/loose connector at solenoid or TCM
Faulty solenoid (coil resistance out of specification)
Faulty TCM driver (less common)

Fault status

⚠️ Status

TCM reports a control circuit fault for Pressure Control Solenoid A (open/short/driver fault). MIL set; TCM may enter limp mode and limit transmission operation until fault is resolved.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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P0964 — Pressure Control Solenoid A Control - Circuit