Pressure Control Solenoid C Intermittent
The P0799 code indicates an intermittent fault in the pressure control solenoid C circuit, which is part of the transmission's hydraulic control system. This solenoid regulates fluid pressure to shift gears smoothly. An intermittent signal suggests a loose connection, wiring issue, or failing solenoid that may come and go, leading to unpredictable transmission behavior.
1. Symptoms You Will Notice
- Check Engine Light on
- Erratic or harsh shifting
- Transmission slipping or delayed engagement
- Reduced fuel economy
2. Most Common Causes
- Faulty pressure control solenoid C
- Wiring or connector issues (corrosion, loose pins, broken wires)
- Low or contaminated transmission fluid
- Internal transmission damage
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect transmission fluid level and condition; top off or replace if needed.
Step 3: Visually check wiring and connectors to solenoid C for damage or corrosion.
Step 4: Test solenoid resistance and power/ground circuits with a multimeter.
Step 5: Perform a transmission pressure test to verify solenoid operation.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as intermittent solenoid failure can cause sudden transmission issues, leading to unsafe driving conditions or further damage.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, depending on whether the solenoid alone needs replacement or if wiring repairs are needed. Labor and parts vary by vehicle.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.