P0747: Pressure Control Solenoid A Stuck On
The P0747 code indicates that the transmission control module (TCM) has detected that pressure control solenoid A is stuck in the 'on' position, causing excessive hydraulic pressure in the transmission. This solenoid regulates line pressure for shifting; when stuck on, it can lead to harsh shifts, slipping, or transmission overheating. Common causes include electrical faults, contaminated transmission fluid, or a failed solenoid.
01. Most Common Causes
- Faulty pressure control solenoid A
- Wiring or connector issues (shorts, opens)
- Low or contaminated transmission fluid
- Internal transmission mechanical failure
02. Symptoms You Will Notice
- Harsh or delayed shifts
- Transmission slipping
- Check Engine Light illuminated
- Poor fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Check transmission fluid level and condition; top off or replace if necessary.
Step 3: Inspect wiring and connectors to solenoid A for damage or corrosion.
Step 4: Test solenoid resistance and operation using a multimeter or scan tool.
Step 5: If solenoid is faulty, replace it; if wiring is bad, repair as needed.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with P0747 can cause harsh shifting, transmission overheating, and potential internal damage. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts and labor. Solenoid replacement is often $100-$250, plus diagnostic fees.