What Does P0749 Mean?
Pressure control solenoid A is exhibiting intermittent electrical behavior. The PCM/TCM has detected the solenoid signal periodically dropping out or fluctuating outside normal parameters. This causes inconsistent line pressure regulation, resulting in unpredictable shift quality — sometimes harsh, sometimes slipping.
Common Causes
35%
Loose or corroded transmission connector causing intermittent electrical contact
25%
Chafed or damaged wiring making intermittent contact
20%
Pressure control solenoid A with intermittent internal coil failure
12%
Intermittent TCM/PCM solenoid driver circuit
8%
Intermittent ground connection for solenoid circuit
Diagnostic Steps
1
Wiggle the transmission connector and wiring harness while monitoring solenoid voltage — look for signal dropouts or fluctuations.
2
Inspect the transmission connector for corrosion, loose terminals, or water damage.
3
Monitor line pressure during a road test — erratic pressure readings that correlate with shift quality changes confirm the intermittent fault.
4
Measure solenoid resistance repeatedly and during connector/harness manipulation — an intermittent open may appear during wiggle testing.
5
Check the internal transmission harness at common failure points (sharp bends, heat-affected areas, and connector junctions).
Estimated Repair Cost
$100 - $1,200
Parts + labor, varies by vehicle and location
Pressure control solenoid A is exhibiting intermittent electrical behavior. The PCM/TCM has detected the solenoid signal periodically dropping out or fluctuating outside normal parameters. This causes inconsistent line pressure regulation, resulting in unpredictable shift quality — sometimes harsh, ...
The most common cause of P0749 (Pressure Control Solenoid A Intermittent) is: Loose or corroded transmission connector causing intermittent electrical contact
Typical repair costs for P0749 range from $100 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Intermittent pressure regulation causes unpredictable shift behavior which can be startling but is not immediately dangerous. However, slipping events can damage clutch packs over time. Repair within a few weeks to prevent further internal damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0749 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Automatic Transmission — Hydraulic Control
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
