What Does P0747 Mean?
The pressure control solenoid is not performing correctly or is stuck in the off position. The PCM/TCM has detected that commanded line pressure does not match actual pressure, indicating the solenoid cannot properly regulate hydraulic pressure. This results in shift quality problems and potential transmission damage.
Safety Warning
Incorrect line pressure compromises all shift events and clutch holding force. The transmission may slip under load, shift extremely harshly, or fail to shift at all. Limit driving and avoid heavy load situations until repaired.
Common Causes
30%
Pressure control solenoid stuck or worn (unable to regulate pressure properly)
25%
Contaminated transmission fluid blocking the solenoid or pressure passages
20%
Valve body wear or damage in the pressure regulation circuit
15%
Wiring or connector fault causing inconsistent solenoid operation
10%
Transmission oil pump worn or weak, unable to supply adequate base pressure
Diagnostic Steps
1
Check transmission fluid level and quality — replace fluid and filter if contaminated.
2
Monitor commanded vs. actual line pressure using live PID data — a consistent discrepancy confirms the solenoid or hydraulic circuit is at fault.
3
Test pressure control solenoid resistance and verify proper current draw under different duty cycles.
4
Perform a stall test to evaluate oil pump output — if pressure is low at stall, the pump may be worn.
5
Remove and inspect the valve body for worn bores, damaged separator plate, or clogged pressure passages.
Estimated Repair Cost
$300 - $2,500
Parts + labor, varies by vehicle and location
The pressure control solenoid is not performing correctly or is stuck in the off position. The PCM/TCM has detected that commanded line pressure does not match actual pressure, indicating the solenoid cannot properly regulate hydraulic pressure. This results in shift quality problems and potential t...
The most common cause of P0747 (Pressure Control Solenoid Performance or Stuck Off) is: Pressure control solenoid stuck or worn (unable to regulate pressure properly)
Typical repair costs for P0747 range from $300 to $2,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Incorrect line pressure compromises all shift events and clutch holding force. The transmission may slip under load, shift extremely harshly, or fail to shift at all. Limit driving and avoid heavy load situations until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0747 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission — Hydraulic Control
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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