Pressure Control Solenoid "C" Control Circuit Range/Performance
Diagnostic trouble code P0969 indicates that the powertrain control module (PCM) or transmission control module (TCM) has detected an out-of-range or unexpected performance condition in the control circuit for pressure control solenoid 'C'. The module sets this code when the actual electrical feedback from the solenoid circuit does not match the expected parameters for the commanded transmission line pressure.
While the vehicle may still be drivable, this code should be addressed promptly. Ignoring it can lead to harsh shifting, transmission slipping, and eventual internal transmission damage due to improper fluid pressure.
Common symptoms
- Illuminated Check Engine Light
- Harsh or erratic transmission shifting
- Transmission slipping between gears
- Transmission stuck in a default or 'limp' mode
- Decreased fuel economy
Likely causes
- Low or dirty transmission fluid
- Faulty pressure control solenoid 'C'
- Damaged, corroded, or loose wiring and connectors in the solenoid circuit
- Clogged transmission fluid filter or internal hydraulic passages
- Faulty transmission pump
- Failing transmission control module (TCM) or PCM (rare)
What to check before replacing parts
Check the transmission fluid level and condition.
Look for: Fluid that is significantly low, burnt, or heavily contaminated with debris, which can cause pressure issues and solenoid malfunction.
Visually inspect the wiring harness and connectors for pressure control solenoid 'C'.
Look for: Frayed wires, melted insulation, pushed-out pins, or corrosion in the connectors that could cause high resistance or an open circuit.
Test the resistance of pressure control solenoid 'C' using a digital multimeter.
Look for: Resistance values that fall outside the manufacturer's specified range, indicating an internal failure of the solenoid.
Check the solenoid circuit for continuity and shorts to ground or power.
Look for: An open circuit, high resistance, or a short in the wiring between the TCM/PCM and the transmission connector.
Perform a transmission line pressure test using a mechanical gauge.
Look for: Actual hydraulic pressure readings that do not match the commanded pressure from a scan tool, indicating a mechanical failure in the pump, valve body, or solenoid.
This page explains the generic P0969 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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