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DTC codes / P07xx · Transmission / P0747

P0747Pressure Control Solenoid 'A' Stuck On

P0747 indicates that the transmission control module has detected the pressure control solenoid 'A' circuit is stuck in the energized or 'on' state, meaning the solenoid is commanding full line pressure when it should be modulating. The computer compares commanded current to actual circuit feedback and sets the code when the solenoid remains engaged longer than expected, often resulting in harsh engagements and firm shifts.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyProfessional
AreaTransmission

Symptoms you may notice

  • Harsh or firm shifting, especially when engaging drive or reverse
  • Delayed or abrupt gear engagements from a stop
  • Transmission may enter limp mode with reduced power or limited gear range
  • Often no symptoms besides the warning light, especially if the fault is intermittent
  • Poor fuel economy due to elevated line pressure and altered shift scheduling
  • Possible shudder or clunk during light-throttle upshifts

Common causes, most likely first

  1. Faulty pressure control solenoid 'A' internally stuck in the energized position
  2. Damaged or chafed wiring harness to the solenoid, shorting the control circuit to power
  3. Corroded or loose electrical connector at the transmission case pass-through
  4. Contaminated transmission fluid causing solenoid valve sticking or debris blocking the valve body passage
  5. Failed transmission control module driver circuit holding the solenoid on
  6. Internal valve body wear or a stuck pressure regulator valve causing excessive line pressure

How to diagnose and fix it

  1. Verify battery voltage and inspect the transmission wiring harness and connectors for chafing, corrosion, or loose pins before condemning any part
  2. Use a scan tool to command the pressure control solenoid on and off while watching actual current and line pressure to confirm the stuck-on condition
  3. Measure resistance across the solenoid at the transmission connector and compare to the manufacturer's specification to rule out an open or shorted coil
  4. Check transmission fluid condition and level; if the fluid is dark or contaminated, perform a fluid and filter service and recheck the code
  5. If electrical checks pass, remove the transmission pan and inspect the solenoid and valve body for debris or sticking, replacing the solenoid if it fails a bench test
  6. After repair, clear the code and perform a relearn or adaptation drive cycle as required by the manufacturer to verify the fix

What most technicians miss on P0747

  • A stuck-on pressure control solenoid often produces no drivability complaint at all, so many of these codes are set by a momentary electrical glitch that never returns after clearing.
  • The code can be set by a short to power in the harness rather than a failed solenoid, so ohm-testing the solenoid alone will not catch a chafed wire that only shorts when the engine moves.
  • Contaminated fluid is a frequent root cause that gets overlooked because the solenoid tests fine on the bench; debris from a failing torque converter clutch or worn clutches can lodge in the solenoid valve.
  • Some vehicles use the same pressure control solenoid to regulate torque converter clutch apply pressure, so a stuck-on solenoid can cause shudder or harsh lockup that owners describe as an engine misfire.
  • Replacing the solenoid without checking line pressure after the repair risks a repeat failure if the valve body or pressure regulator is the actual source of excessive pressure.

Can I keep driving with P0747?

You can usually drive the vehicle to a repair shop, but avoid heavy throttle and towing because the elevated line pressure can accelerate clutch and band wear. If the transmission is in limp mode or shifts violently, stop driving and have it towed to prevent internal damage.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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