Shift Solenoid C Intermittent
The P0764 code indicates that the Powertrain Control Module (PCM) has detected an intermittent malfunction in the Shift Solenoid C circuit. This solenoid controls hydraulic pressure to engage a specific gear in the automatic transmission. An intermittent fault means the issue comes and goes, often due to loose connections, wiring damage, or internal solenoid failure. This can cause erratic shifting, transmission slippage, or limp mode.
1. Symptoms You Will Notice
- Check Engine Light on
- Erratic or harsh shifting
- Transmission slipping or delayed engagement
- Vehicle enters limp mode
2. Most Common Causes
- Faulty shift solenoid C
- Damaged or corroded wiring/connectors
- Low transmission fluid level or dirty fluid
- Internal transmission mechanical failure
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect transmission fluid level and condition.
Step 3: Visually check wiring and connectors for damage or corrosion.
Step 4: Test solenoid resistance and power/ground circuits with a multimeter.
Step 5: Perform a transmission pressure test if needed.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the transmission may fail or cause unsafe driving conditions. Limp mode may limit speed.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. Solenoid replacement can range from $200-$500 including parts and labor, depending on vehicle.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.