Pressure Control Solenoid Stuck On
What does P0747 mean?
The P0747 code means the vehicle's onboard diagnostic system has detected: Pressure Control Solenoid Stuck On. This is a critical severity code.
Common Symptoms
- Check Engine Light illuminated
- Very high line pressure causing harsh shifts
- Banging into gears
- Transmission overheating
- Possible transmission damage
Probable Causes (Ranked by Likelihood)
- Pressure control solenoid stuck in high pressure position Very High
- Valve body pressure regulator valve stuck High
- Wiring short keeping solenoid energized Moderate
- TCM commanding maximum pressure erroneously Low
Step-by-Step Diagnostic Procedure
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Perform a line pressure test -- excessively high pressure confirms the issue
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Check pressure control solenoid for mechanical sticking
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Inspect valve body pressure regulator valve
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Check for wiring shorts in the solenoid circuit
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Replace the pressure control solenoid
Frequently Asked Questions
Can I drive with code P0747?
Do not drive -- have the vehicle towed. Pressure Control Solenoid Stuck On can cause severe transmission damage if ignored.
What is the most common fix for P0747?
The most common fix is replacing the affected solenoid. In some cases, a transmission fluid flush and solenoid replacement resolves the issue. Internal torque converter or valve body damage requires more extensive repair.
Can I replace the solenoid myself?
On some vehicles, shift solenoids are accessible by removing the transmission pan. On others, the valve body must be removed. This is a moderate to hard DIY job requiring transmission fluid drainage and careful reassembly.