Pressure Control Solenoid C
The Powertrain Control Module (PCM) or Transmission Control Module (TCM) has detected a malfunction in the transmission pressure control solenoid C circuit. This code is set when the module detects an electrical fault in the circuit or when the actual transmission line pressure does not match the commanded pressure.
This code requires prompt attention as driving with improper transmission line pressure can cause severe internal transmission damage. It may also cause the vehicle to enter limp mode, significantly reducing drivability and safety.
Common symptoms
- Illuminated Check Engine Light
- Transmission slipping between gears
- Harsh, delayed, or erratic shifting
- Vehicle stuck in limp mode (limited to a single gear)
- Decreased fuel economy and poor acceleration
Likely causes
- Low or contaminated transmission fluid
- Defective transmission pressure control solenoid C
- Damaged, shorted, or corroded wiring and connectors in the solenoid circuit
- Clogged transmission fluid filter or blocked internal hydraulic passages
- Failing transmission pump
- Faulty Transmission Control Module (TCM) or PCM
What to check before replacing parts
Check the transmission fluid level and condition.
Look for: Fluid that is low, burnt, or heavily contaminated with debris, which indicates a fluid maintenance issue or internal mechanical failure.
Inspect the wiring harness and connectors associated with pressure control solenoid C.
Look for: Frayed wires, melted insulation, or corroded connector pins that would cause an open or short circuit.
Test the electrical resistance of pressure control solenoid C using a digital multimeter.
Look for: Resistance readings that fall outside the manufacturer's specified range, indicating a failed internal solenoid coil.
Command the solenoid on and off using a bi-directional scan tool.
Look for: An audible click from the transmission pan area; a lack of a click suggests the solenoid is mechanically stuck or electrically dead.
Perform a transmission line pressure test using a mechanical pressure gauge.
Look for: Actual hydraulic pressure readings that do not match the TCM's commanded pressure, pointing to a faulty pump, valve body, or solenoid.
This page explains the generic P0795 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
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