Pressure Control Solenoid C Performance or Stuck off
P0796 indicates that the Pressure Control Solenoid C is not functioning properly or is stuck in the off position, preventing proper transmission fluid pressure regulation. This solenoid controls hydraulic pressure for specific gear shifts, and its failure disrupts normal transmission operation and can cause the vehicle to enter limp mode.
What You Might Notice
- Check Engine Light illuminated
- Transmission enters limp mode (reduced power/limited gears)
- Transmission slips during gear shifts
- Transmission overheating
- Decreased fuel economy
- 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 is stuck, preventing it from opening or closing properly to regulate transmission pressure.
- 2
Dirty or Contaminated Transmission Fluid
Old, burnt, or contaminated fluid can cause solenoid sticking and block proper hydraulic flow, reducing solenoid performance.
- 3
Clogged Transmission Filter or Restricted Passages
A dirty filter or debris-blocked hydraulic passages restrict pressure control, causing the solenoid to malfunction or not receive adequate fluid pressure.
- 4
Corroded or Damaged Electrical Connector/Wiring
Poor electrical connection or damaged wiring to the solenoid prevents proper voltage supply, causing the solenoid to fail activation.
How to Diagnose It
- 1
Check Defective Pressure Control Solenoid C — The solenoid coil has failed electrically or the internal valve is stuck, preventing it from opening or closing properly to regulate transmission pressure.
- 2
Check Dirty or Contaminated Transmission Fluid — Old, burnt, or contaminated fluid can cause solenoid sticking and block proper hydraulic flow, reducing solenoid performance.
- 3
Check Clogged Transmission Filter or Restricted Passages — A dirty filter or debris-blocked hydraulic passages restrict pressure control, causing the solenoid to malfunction or not receive adequate fluid pressure.
- 4
Check Corroded or Damaged Electrical Connector/Wiring — Poor electrical connection or damaged wiring to the solenoid prevents proper voltage supply, causing the solenoid to fail activation.
How to Fix It
- 1
Replace Pressure Control Solenoid C
Remove and replace the defective solenoid with a new or remanufactured unit, ensuring proper connector seating and torque specifications for your transmission type.
- 2
Perform Transmission Fluid and Filter Change
Drain old transmission fluid completely, replace the transmission filter, refill with manufacturer-specified fluid type, and check fluid level. This addresses contamination issues that may be affecting solenoid operation.
- 3
Inspect and Repair Electrical Connections
Check the solenoid connector and wiring harness for corrosion, loose pins, or damaged insulation. Clean connectors with contact cleaner and repair or replace damaged wiring as needed.
- 4
Inspect Transmission Valve Body and Passages
If solenoid replacement and fluid service do not resolve the code, inspect the valve body for scoring or damage and check hydraulic passages for restrictions that may require transmission overhaul or valve body replacement.
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