P0796: Pressure Control Solenoid C Performance or Stuck Off
The P0796 code indicates that the Powertrain Control Module (PCM) has detected a malfunction in the pressure control solenoid 'C' circuit. This solenoid regulates hydraulic pressure within the automatic transmission to control shift timing and firmness. When the solenoid is stuck off or performing incorrectly, the transmission may experience harsh or delayed shifts, slipping, or fail to shift properly. Common causes include low or contaminated transmission fluid, a faulty solenoid, electrical issues (wiring or connector problems), or internal transmission damage.
1. Symptoms You Will Notice
- Harsh or delayed shifts
- Transmission slipping
- Check Engine Light illuminated
- Transmission stuck in gear or fails to shift
2. Most Common Causes
- Low or dirty transmission fluid
- Faulty pressure control solenoid C
- Wiring or connector issues in solenoid circuit
- Internal transmission mechanical failure
3. Step-by-Step Diagnosis
Step 1: Scan the vehicle for codes and record freeze frame data.
Step 2: Check transmission fluid level and condition; top off or replace if necessary.
Step 3: Inspect wiring and connectors for damage, corrosion, or loose connections.
Step 4: Test solenoid resistance and operation using a multimeter or scan tool.
Step 5: If solenoid is faulty, replace it; if wiring is bad, repair as needed.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with this code, as it can cause further transmission damage. If the transmission is slipping or shifting erratically, have it inspected immediately.
How much does it cost to fix?▼
Repair costs vary: replacing the solenoid can cost $150-$400 including parts and labor. If internal transmission damage is found, costs can exceed $1,500.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.