Pressure Control Solenoid A Intermittent
The P0749 code indicates that the transmission control module (TCM) has detected an intermittent electrical or hydraulic fault in the pressure control solenoid A circuit. This solenoid regulates hydraulic pressure to the transmission clutches and bands for smooth shifting. An intermittent fault means the issue comes and goes, often due to loose connections, damaged wiring, or internal solenoid wear. If left unaddressed, it can lead to erratic shifting, transmission slippage, and eventual internal damage.
01. Most Common Causes
- Faulty pressure control solenoid A
- Damaged or corroded wiring/connectors in the solenoid circuit
- Low or contaminated transmission fluid
- Internal transmission mechanical issues
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Erratic or harsh shifting
- Transmission slipping or delayed engagement
- Reduced fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data to capture conditions when fault occurred.
Step 2: Inspect transmission fluid level and condition; top off or replace if necessary.
Step 3: Visually check wiring and connectors to solenoid A for damage, corrosion, or loose pins.
Step 4: Test solenoid resistance and power/ground circuits with a multimeter; compare to manufacturer specs.
Step 5: If wiring and fluid are okay, replace pressure control solenoid A and retest.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with an intermittent solenoid fault can cause unpredictable shifting and may lead to transmission damage. Have it diagnosed promptly.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts and labor. Solenoid replacement is often $50-$150 for the part plus 1-2 hours of labor.