What it means
The transmission control module monitors whether pressure control solenoid P follows its commanded state. It sets this code when the solenoid remains on after being commanded off.
At a glance
- Usually lights the check-engine light
How it works
Pressure Control Solenoid P controls hydraulic pressure in the transmission in response to commands from the transmission control module. This code sets when the module commands Solenoid P off but detects that it remains on, potentially because its spool is stuck open or its output driver is holding it on.
Common causes
Most likely first.
- Solenoid spool stuck in open position
- TCM output driver stuck on
- Carbon or debris buildup preventing free movement
Symptoms
- Transmission warning light may illuminate
- Harsh or delayed shifting
- Slipping or unexpected shifts
- Transmission may enter limp mode
How to diagnose it
- Record freeze-frame data and scan for related transmission codes to see when the module detected Solenoid P remaining on.
- Check transmission fluid level and condition using the vehicle’s specified procedure, because fluid problems can contribute to abnormal pressure behavior.
- Inspect Solenoid P wiring and its connector for damage, corrosion, loose terminals, or fluid intrusion.
- With a scan tool, compare the commanded state of Solenoid P with available pressure or shift data to confirm the unexpected pressure response when it is commanded off.
- If the wiring checks out, test the solenoid and its control output using the manufacturer’s diagnostic procedure to distinguish a stuck spool from a driver fault.
Common fixes
- Correct the transmission fluid level or condition if needed.
- Clean and secure the Solenoid P connector or repair damaged wiring.
- Repair or replace Pressure Control Solenoid P if its spool is stuck open.
- Repair the TCM output driver if testing confirms it continues to energize Solenoid P.
Can I keep driving?
Limit driving and avoid towing or hard acceleration because abnormal pressure can cause harsh shifts or clutch slip. Stop and arrange recovery if the transmission loses drive or shifts unpredictably.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.