P0968: Pressure Control Solenoid 'C' Control Circuit/Open
The P0968 code indicates an open or malfunction in the control circuit of the pressure control solenoid 'C'. This solenoid is part of the transmission's hydraulic system, regulating line pressure for proper shifting. An open circuit means the powertrain control module (PCM) detects no continuity or excessive resistance in the solenoid's electrical circuit, preventing it from controlling pressure accurately. This can lead to harsh or delayed shifts, slipping, or transmission overheating.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or erratic shifting
- Transmission slipping or delayed engagement
- Reduced fuel economy
2. Most Common Causes
- Open or shorted wiring in the solenoid circuit
- Faulty pressure control solenoid 'C'
- Corroded or damaged connector
- Failed PCM (rare)
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect wiring and connectors for damage, corrosion, or loose connections.
Step 3: Test solenoid resistance with a multimeter (specs vary, typically 5-20 ohms).
Step 4: Check for power and ground at the solenoid connector with the ignition on.
Step 5: If wiring and solenoid are good, test PCM output or replace PCM as last resort.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with an open solenoid circuit can cause transmission damage due to improper pressure control, leading to slipping or overheating.
How much does it cost to fix?▼
Repair costs typically range from $200 to $600, including parts and labor. A solenoid replacement is often $150-$300, plus diagnostic time.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.