What Does P2684 Mean?
The PCM has detected an open circuit or malfunction in the actuator supply voltage "C" circuit. This power supply circuit feeds voltage to various actuators and solenoids controlled by the PCM.
Common Causes
40%
Blown fuse or fusible link supplying actuator power circuit C
30%
Broken or disconnected wiring in actuator supply voltage circuit
20%
Failed relay providing power to actuator circuit C
10%
Corroded or loose power distribution connector
Diagnostic Steps
1
Step 1: Locate and check all fuses related to actuator power circuits using wiring diagram; replace any blown fuses
2
Step 2: Check voltage at power distribution point for circuit C with key on; should read battery voltage
3
Step 3: Inspect power relay operation (if applicable); listen for click and measure output voltage
4
Step 4: Trace wiring from power source to affected actuators checking for opens or high resistance
5
Step 5: Check PCM connector terminals for damage or corrosion on voltage supply pin C
Estimated Repair Cost
$100 - $600
Parts + labor, varies by vehicle and location
The PCM has detected an open circuit or malfunction in the actuator supply voltage "C" circuit. This power supply circuit feeds voltage to various actuators and solenoids controlled by the PCM.
The most common cause of P2684 (Actuator Supply Voltage "C" Circuit/Open) is: Blown fuse or fusible link supplying actuator power circuit C
Typical repair costs for P2684 range from $100 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Multiple systems may be inoperative depending on which actuators are fed by circuit C. Vehicle may experience reduced performance, emissions issues, or driveability concerns.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2684 to identify the root cause.
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Quick Info
Category
Powertrain
System
Actuator Power Supply Circuit
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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