P0747 critical

Pressure Control Solenoid Stuck On

The P0747 code means the vehicle's onboard diagnostic system has detected: Pressure Control Solenoid Stuck On. This is a critical severity code.

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Keep driving?: No -- stop driving
DIY difficulty: hard
Estimated cost: $200 - $900 (parts and labor)

Check Your Fluid First

ANCEL AD310 OBD-II Scanner

Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.

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Read Transmission Codes

LAUNCH CRP123X (Reads All Systems)

Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.

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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

Perform a line pressure test -- excessively high pressure confirms the issue
Check pressure control solenoid for mechanical sticking
Inspect valve body pressure regulator valve
Check for wiring shorts in the solenoid circuit
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.