Pressure Control Solenoid Electrical
What does P0748 mean?
The P0748 code means the vehicle's onboard diagnostic system has detected: Pressure Control Solenoid Electrical. This is a critical severity code.
Common Symptoms
- Check Engine Light illuminated
- Harsh or erratic shifting
- Transmission in limp mode
- Delayed gear engagement
Probable Causes (Ranked by Likelihood)
- Open or short in pressure control solenoid wiring Very High
- Failed pressure control solenoid coil High
- Corroded transmission connector pins Moderate
- TCM pressure control driver circuit failure Low
Step-by-Step Diagnostic Procedure
-
Measure pressure control solenoid resistance at the transmission connector
-
Check for voltage at the solenoid when TCM commands it on
-
Inspect the transmission harness connector for corrosion or damage
-
Check wiring continuity from TCM to the solenoid
-
Replace the solenoid if electrically faulty
Frequently Asked Questions
Can I drive with code P0748?
Do not drive -- have the vehicle towed. Pressure Control Solenoid Electrical can cause severe transmission damage if ignored.
What is the most common fix for P0748?
The most common fix is replacing the affected solenoid. In some cases, a transmission fluid flush and solenoid replacement resolves the issue. Internal torque converter or valve body damage requires more extensive repair.
Can I replace the solenoid myself?
On some vehicles, shift solenoids are accessible by removing the transmission pan. On others, the valve body must be removed. This is a moderate to hard DIY job requiring transmission fluid drainage and careful reassembly.