What Does P1746 Mean?
The electronic pressure control solenoid circuit has an open circuit condition, preventing the transmission control module from properly regulating transmission line pressure. This solenoid is critical for smooth shift quality and transmission protection.
Safety Warning
Critical issue - transmission may have no line pressure control, causing harsh shifts, slipping, or complete loss of drive. Vehicle should not be driven until repaired to prevent transmission damage.
Common Causes
40%
Failed electronic pressure control solenoid
25%
Open circuit in EPC solenoid wiring harness
20%
Broken or corroded connector terminals
10%
Damaged internal transmission harness
5%
TCM internal driver circuit failure
Diagnostic Steps
1
Step 1: Measure resistance across EPC solenoid terminals (typically 3-8 ohms)
2
Step 2: Check for continuity in wiring between TCM and solenoid connectors
3
Step 3: Inspect transmission connector for corrosion, bent pins, or oil contamination
4
Step 4: Backprobe circuit and measure voltage supply from TCM during operation
5
Step 5: Drop pan to access and test/replace EPC solenoid if external wiring is intact
Estimated Repair Cost
$200 - $1,200
Parts + labor, varies by vehicle and location
The electronic pressure control solenoid circuit has an open circuit condition, preventing the transmission control module from properly regulating transmission line pressure. This solenoid is critical for smooth shift quality and transmission protection.
The most common cause of P1746 (Electronic Pressure Control Solenoid - Open circuit) is: Failed electronic pressure control solenoid
Typical repair costs for P1746 range from $200 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Critical issue - transmission may have no line pressure control, causing harsh shifts, slipping, or complete loss of drive. Vehicle should not be driven until repaired to prevent transmission damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1746 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
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
