C3679 Engine Trouble Code
What is C3679?
The C3679 check-engine light can indicate issues ranging from minor (loose gas cap) to serious (catalytic converter failure). Professional diagnostic scanning at a dealer or shop will identify the exact cause and required repairs.
Code Information
| Code Type: | OBD-II Chassis (C) Trouble Code |
| System: | Chassis |
| Code: | C3679 |
C3679 Symptoms
Check Engine Light
Illuminated dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration
Starting Problems
Difficulty starting the engine
C3679 Code Structure
Understanding what each digit means in the C3679 chassis trouble code:
| C | 3 | 6 | 7 | 9 |
|---|---|---|---|---|
| Chassis Code | Ignition System Or Misfire | Fuel Temperature Sensor B Circuit Range/Performance | Cylinder 10 Contribution/Balance Fault | Reverse Input Circuit |
How to Fix C3679
Diagnostic Steps:
Check if fuel pump primes when key is turned to ON. Measure fuel pressure and verify bright white-blue spark at all plugs. Also verify mechanical timing alignment.
Repair Solution:
Most manufacturers number cylinders sequentially from front to back. Ford V-engines start with cylinder 1 at front left. In V-6 engines, cylinder 4 is front right; in V-8 engines, cylinder 5 occupies that position.
Technical Notes:
For C3679, verify VCT solenoid operation. Look for stuck or sticking valves caused by contamination. Consult vehicle-specific repair manual for proper component testing procedures.
C3679 Description
C3679 engine trouble code is related to Reverse Input Circuit.
Main Cause
The primary reason for C3679 OBD-II Engine Trouble Code is: Fuel Temperature Sensor B Circuit Range/Performance.