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 (usually 3rd or 4th gear depending on transmission design). An intermittent fault means the issue comes and goes, often due to wiring problems, loose connections, or internal solenoid failure. This can cause erratic shifting, transmission slippage, or limp mode.
01. Most Common Causes
- Faulty shift solenoid C
- Damaged wiring or connectors in the solenoid circuit
- Low transmission fluid level or dirty fluid
- Internal transmission mechanical issues
02. Symptoms You Will Notice
- Check Engine Light on
- Erratic or harsh shifting
- Transmission slipping or delayed engagement
- Vehicle enters limp mode
03. 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 necessary.
Step 3: Visually check wiring and connectors to shift solenoid C for damage, corrosion, or loose pins.
Step 4: Test solenoid resistance and power/ground circuits with a multimeter; compare to specs.
Step 5: If wiring and solenoid are okay, perform a transmission pressure test to rule out mechanical issues.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with an intermittent solenoid fault can cause unpredictable shifting, transmission damage, or complete failure. Have it diagnosed promptly.
How much does it cost to fix?▼
Repair costs vary: solenoid replacement $150-$300, wiring repair $100-$200, plus diagnostic fees. Total typically $150-$400.