P0746
UniversalPressure Control Solenoid Performance or Stuck Off
High SeverityThe P0746 code indicates that the vehicle's Powertrain Control Module (PCM) or Transmission Control Module (TCM) has detected an issue with the Pressure Control Solenoid 'A'. This typically means the solenoid is not performing as expected, often being stuck in the 'off' position, leading to incorrect transmission fluid pressure and affecting gear shifts.
⚠️ Before You Begin (Safety First)
Always allow the engine and transmission to cool before attempting any work involving transmission fluid, as components can be extremely hot. Disconnect the vehicle's negative battery terminal before performing any electrical work or component replacement to prevent accidental shorts or injury. Use proper jack stands when working under the vehicle and wear appropriate personal protective equipment, including safety glasses and gloves.
Common Symptoms
- Check Engine Light illuminated
- Harsh or delayed shifting
- Transmission slipping between gears
- Vehicle entering limp mode
- Reduced fuel economy
- Transmission overheating
Common Causes
- Faulty transmission pressure control solenoid 'A'
- Dirty or contaminated transmission fluid
- Clogged transmission fluid filter
- Internal transmission mechanical failure
- Wiring harness issues (open, short, or poor connection) to the solenoid
- Faulty Transmission Control Module (TCM) or Powertrain Control Module (PCM)
Frequently reported on: Ford F-150 (2004-2010), Chevrolet Silverado (2007-2013), Honda Accord (2003-2007), Toyota Camry (2002-2006)
Diagnostic Steps
- Check transmission fluid level and condition. Ensure it's at the correct level and not dark, burnt, or contain debris.
- Inspect the wiring harness and connectors leading to the transmission and pressure control solenoid for any signs of damage, corrosion, or loose connections.
- Clear the DTC (Diagnostic Trouble Code) and test drive the vehicle to see if the code returns.
- If possible, visually inspect the pressure control solenoid for external damage (requires dropping the transmission pan on some models).
- Consider replacing the transmission fluid and filter as a first step if the fluid is dirty, as a clogged filter can restrict fluid flow.
- If the solenoid is accessible externally, test its resistance or replace it according to service manual specifications.
👨🔧 When to Call a Professional
If diagnostic steps confirm an internal transmission issue or if symptoms persist after checking external components, it is strongly advised to consult a professional transmission specialist. Internal transmission repairs require specialized tools and extensive knowledge to perform correctly and safely.
Commonly Asked Questions
What exactly does a pressure control solenoid do?
A pressure control solenoid regulates the hydraulic pressure within the transmission, which is crucial for smooth and timely gear changes. It ensures the correct amount of fluid pressure is applied to the clutch packs for each gear.
Can I drive with a P0746 code?
While the vehicle may still be drivable, it is not recommended to drive for an extended period with this code. It can lead to severe transmission damage due to incorrect fluid pressure, causing excessive wear on internal components or overheating.
What is the most common cause of P0746?
The most common cause is usually a faulty pressure control solenoid itself, or dirty/low transmission fluid that impairs its operation or clogs the transmission filter.
How much does it cost to fix P0746?
The cost varies greatly. Replacing a solenoid can range from a few hundred dollars for parts and labor if it's externally accessible, to over a thousand if the transmission needs to be partially disassembled or if there's internal damage requiring a full rebuild.
If I replace the solenoid and the code returns, what should I do next?
If the code returns after replacing the solenoid, you should re-check the transmission fluid level and condition, inspect the wiring thoroughly, and consider professional diagnosis for potential internal transmission mechanical issues or a faulty Transmission Control Module (TCM) or PCM.