What Does P1779 Mean?
The transmission control module has detected an electrical fault in the clutch solenoid control circuit. This solenoid controls clutch pack engagement within the transmission for gear changes.
Common Causes
40%
Failed clutch solenoid (internal short or open circuit)
25%
Damaged wiring harness or connector to solenoid
15%
Low transmission fluid level causing solenoid malfunction
12%
Internal transmission short circuit or fluid contamination
8%
TCM internal driver circuit failure
Diagnostic Steps
1
Step 1: Check transmission fluid level and condition for proper fill and contamination
2
Step 2: Measure resistance of clutch solenoid using ohmmeter (should be 10-40 ohms typically)
3
Step 3: Disconnect solenoid connector and test for voltage supply from TCM during operation
4
Step 4: Inspect internal transmission harness connector for fluid intrusion or corrosion
5
Step 5: Perform solenoid activation test using scan tool bi-directional controls
Estimated Repair Cost
$250 - $1,200
Parts + labor, varies by vehicle and location
The transmission control module has detected an electrical fault in the clutch solenoid control circuit. This solenoid controls clutch pack engagement within the transmission for gear changes.
The most common cause of P1779 (Clutch Solenoid Circuit Malfunction) is: Failed clutch solenoid (internal short or open circuit)
Typical repair costs for P1779 range from $250 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May cause harsh shifts, delayed engagement, or inability to shift properly. Continued driving could cause additional transmission damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1779 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission Control System
Difficulty
Type
Manufacturer
Recommended Tools
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