Pressure Control Solenoid C Malfunction
P0795 indicates the transmission control module has detected a malfunction with Pressure Control Solenoid C, which regulates hydraulic pressure in the transmission. This solenoid controls fluid flow to manage gear shifting and transmission operation, so a failure prevents proper pressure modulation and causes shifting problems.
What You Might Notice
- Check Engine Light illuminated
- Transmission enters limp mode or restricted operation
- Transmission slips when shifting gears
- Transmission overheating
- Transmission catches or hesitates in gear
Most Common Causes
- 1
Defective Pressure Control Solenoid C
The solenoid coil has failed electrically or the internal valve has stuck, preventing proper pressure control. This is the most common cause and requires solenoid replacement.
- 2
Dirty or contaminated transmission fluid
Degraded fluid with debris or sludge clogs hydraulic passages and prevents the solenoid from operating correctly. Regular fluid maintenance prevents this issue.
- 3
Clogged transmission filter
A severely restricted filter reduces fluid flow and pressure, causing the solenoid control circuit to malfunction. Filter replacement restores normal flow.
- 4
Corroded or damaged solenoid connector or wiring
Poor electrical connections prevent the PCM from commanding the solenoid properly. Connector corrosion or damaged wire insulation breaks the control signal.
How to Diagnose It
- 1
Check Defective Pressure Control Solenoid C — The solenoid coil has failed electrically or the internal valve has stuck, preventing proper pressure control. This is the most common cause and requires solenoid replacement.
- 2
Check Dirty or contaminated transmission fluid — Degraded fluid with debris or sludge clogs hydraulic passages and prevents the solenoid from operating correctly. Regular fluid maintenance prevents this issue.
- 3
Check Clogged transmission filter — A severely restricted filter reduces fluid flow and pressure, causing the solenoid control circuit to malfunction. Filter replacement restores normal flow.
- 4
Check Corroded or damaged solenoid connector or wiring — Poor electrical connections prevent the PCM from commanding the solenoid properly. Connector corrosion or damaged wire insulation breaks the control signal.
How to Fix It
- 1
Replace Pressure Control Solenoid C
Remove the old solenoid from the transmission valve body or solenoid pack and install a new one. Verify proper electrical connector seating and test shift quality after installation.
- 2
Flush and replace transmission fluid and filter
Drain contaminated fluid, replace the transmission filter, and refill with fresh fluid meeting vehicle specifications. This removes debris restricting solenoid operation.
- 3
Inspect and repair solenoid wiring and connectors
Check the harness from the PCM to the solenoid for corrosion, damage, or loose pins. Clean corroded connectors or replace damaged wiring to restore electrical control.
- 4
Scan and reprogram the PCM if needed
Use a diagnostic scanner to verify the solenoid is receiving proper command signals from the PCM. If software corruption is detected, reprogram the module.
Need a deeper diagnosis?
Search for related repair guides or browse by system.