P0747
UniversalPressure Control Solenoid 'A' - Stuck On
Medium SeverityThis code indicates that the Pressure Control Solenoid 'A' in your vehicle's transmission is stuck in an 'on' position, leading to incorrect hydraulic pressure regulation. This malfunction can result in harsh or erratic gear shifts, reduced fuel economy, and potential damage to the transmission if not addressed.
⚠️ Before You Begin (Safety First)
Always ensure your vehicle is safely supported on jack stands and the engine is off before working underneath. Disconnect the battery before performing any electrical work or removing transmission components to prevent accidental shorts or injury. Transmission fluid can be hot, so allow the vehicle to cool if checking fluid levels or draining.
Common Symptoms
- Check Engine Light illuminated
- Harsh or erratic shifting
- Transmission slipping
- Poor fuel economy
- Vehicle going into "limp mode"
- Delayed engagement of gears
Common Causes
- Defective Pressure Control Solenoid 'A'
- Contaminated transmission fluid
- Clogged transmission fluid filter
- Internal transmission mechanical failure
- Wiring issues or poor electrical connection to the solenoid
- Faulty Transmission Control Module (TCM)
Frequently reported on: Ford F-150 2004-2008, Chevrolet Silverado 2000-2006, Dodge Grand Caravan 2008-2017, Honda Accord 2003-2007, Toyota Camry 2002-2006
Diagnostic Steps
- Check transmission fluid level and condition. Top off or replace if low or contaminated.
- Inspect wiring and connectors to the transmission and pressure control solenoid for damage or corrosion.
- Clear the code and test drive the vehicle to see if the code returns.
- If accessible, remove and test the Pressure Control Solenoid 'A' for proper operation (usually involves checking resistance and functionality with a multimeter and power source).
- Replace the faulty Pressure Control Solenoid 'A'. This often requires dropping the transmission pan and replacing the filter.
- After replacement, refill transmission fluid, clear the code, and perform a road test.
👨🔧 When to Call a Professional
If, after initial diagnostics, you find that the transmission fluid is severely burnt or contaminated, or if the problem persists after replacing the solenoid, it's best to consult a professional transmission specialist to prevent further costly damage.
Commonly Asked Questions
Can I drive my car with a P0747 code?
It is not recommended to drive for an extended period with a P0747 code. While the car may still be drivable, the harsh shifting and potential for transmission damage can worsen over time.
What is the Pressure Control Solenoid 'A'?
The Pressure Control Solenoid 'A' is an electronic valve within the transmission that regulates the hydraulic pressure needed for smooth and precise gear changes.
Is changing the transmission fluid and filter enough to fix P0747?
Sometimes, contaminated or low transmission fluid can contribute to solenoid issues. Changing the fluid and filter is a good first step, but often, the solenoid itself needs to be replaced if it is truly stuck.
How expensive is it to replace a Pressure Control Solenoid?
The cost varies significantly by vehicle and labor rates. The part itself might be $50-$200, but labor can add $200-$500 or more, especially if the transmission pan needs to be dropped and extensive access is required.
Does P0747 always mean the transmission is failing?
Not necessarily. While it indicates an issue within the transmission, it often points to a specific component (the solenoid) that can be replaced. However, if left unaddressed, it can lead to more severe internal transmission damage.